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[smilesdavis]

Macintosh MIDI Interfaces — Serial / USB / PCI / FireWire / MIDI LAN Timeline — Post 1: Overview

Software / timing shorthand

• OMS=Opcode Open Music System.
• FM=MOTU FreeMIDI.
• MTP=MOTU MIDI Time Piece multi-port protocol/emulation.
• MTS=MOTU MIDI Time Stamping; useful only with software that supports it.
• AMT=Emagic Active MIDI Transmission; timestamp-style scheduling used by compatible Emagic/Logic software.
• LTB=Steinberg Linear Time Base; timestamped output scheduling used by compatible Steinberg software.
• MTC=MIDI Time Code.
• DTL=MOTU Direct Time Lock.
• FSK=frequency-shift-keyed tape sync; “Smart FSK”/FSK2 variants can carry song-position/tempo information.
• Classic Mac OS does not provide the modern generic USB-MIDI class-compliant path familiar from OS X; most USB devices here need their period vendor driver plus OMS/FreeMIDI or a vendor-specific MIDI layer.

Chronology — dedicated MIDI interfaces

Year	Manufacturer	Model	rebrands	Host connection	MIDI I/O	OMS / FreeMIDI / timing	Classic Mac OS	Driver	Notes
1986	Southworth	JamBox/4	—	Mac serial	4 In / 4 Out	proprietary Mac control; SMPTE sync	Classic Mac; exact range ?	JamBox/Mac control software ?	early Macintosh 4×4 MIDI/SMPTE interface; predecessor to JamBox/4+
1987	Opcode	Professional Plus	—	Mac serial	1 In / 3 Out	standard serial; later OMS Standard MIDI Interface	Classic Mac; exact range ?	generic serial / later OMS Standard MIDI Interface	already advertised Aug/Sep 1987; 1 MHz serial architecture
1987	Opcode	Studio Plus Two	—	Mac serial ×2	2 In / 6 Out / 32 ch	standard dual-serial; later OMS Standard MIDI Interface	Classic Mac; exact range ?	generic serial / later OMS Standard MIDI Interface	two independent 1×3 sections; printer/modem bypass
1987-10	Southworth	JamBox/4+	—	Mac serial	4×4 / 64 ch	high-speed Mac mode; SMPTE→MTC/DTL	Classic Mac; exact range ?	JamBox Desk Accessory / MidiPaint integration	merge/filter/rechannelize; SMPTE reader/generator; updated JamBox/4
1987-12	Apple	Apple MIDI Interface A9M0103	—	Mac serial	1×1 / 16 ch	standard serial; later generic OMS path	Macintosh; exact range ?	standard serial / later OMS Standard MIDI Interface	Apple-branded self-powered interface; also Apple IIGS
1987/88	Passport	Macintosh MIDI Interface	—	Mac serial	1×1 early; later 1×3 report ?	standard serial	Classic Mac; exact range ?	standard serial	1987/88 catalog=1×1; 1992 book describes a Passport 1×3 interface; revision/name relation unresolved
1987/88	Sonus	MacFace	—	Mac serial ×2	2 In / 6 Out	standard dual-serial	Classic Mac; exact range ?	standard serial	external PSU; functions as MIDI Thru box with Mac off
1988-04	Argents	Mini MIDI Communicator	—	Mac serial	1 In / 4 Out	standard serial	Classic Mac; exact range ?	standard serial	compact member of Argents Macintosh interface family
1988-04	Argents	MIDI Communicator	—	Mac serial ×2	2 In / 8 Out	standard dual-serial	Classic Mac; exact range ?	standard serial	two banks of four Outs; printer/modem pass-through
≤1989	Passport	MIDI Transport	—	Mac serial ×2	2 In / 4 Out	SMPTE→MTC / DTL; FSK→Song Pointer	Classic Mac; exact range ?	Passport control/software path ?	reads/writes SMPTE; designed to sit under Mac
1989-10	Lone Wolf	MIDITap	—	RS-422/232 + MediaLink fibre	4×4	MediaLink routing/merge/filter; Mac control software	Classic Mac; exact range ?	Lone Wolf network-management software ?	2 Mb/s proprietary MIDI LAN bridge; later documented in Mac studios
1990-01	JL Cooper	SyncMaster	—	Mac serial ×2	2 In / 6 Out	SMPTE→MTC / DTL / Smart FSK	Classic Mac; exact range ?	SyncMaster Mac control/DA ?	SMPTE read/generate/regenerate; printer/modem Thru; introduced Jan 1990
1990	MOTU	MIDI Time Piece I	—	Mac serial	8×8 / 128 ch	MTP; later FM / OMS-MTP path	?→9.x	FreeMIDI/MTP driver; OMS MTP driver	MOTU's first hardware; SMPTE; networkable
1990-10	JL Cooper	MacNexus	—	Mac serial	1 In / 3 Out	standard serial; later generic OMS path	Classic Mac; exact range ?	standard serial / later OMS Standard MIDI Interface	basic self-contained Mac interface; announced in 1990 period press
1991-04	Anatek	Pocket Mac	—	Mac serial	1 In / 2 Out	standard serial	Classic Mac; exact range ?	standard serial	self-powered budget Pocket-series Mac interface
1991	Altech	MIDIFace LX / EX	—	Mac serial	1 In / 3 Out	standard serial; later generic OMS path	Classic Mac; exact range ?	standard serial / later OMS Standard MIDI Interface	EX adds serial Thru switch; EX advertised as new in 1991
1991-09	JL Cooper	Sync-Link	—	Mac serial ×2	2×2 / 32 ch	SMPTE/FSK→MTC / DTL / MIDI Clock	Classic Mac; exact range ?	Sync-Link Desk Accessory	free-run + jam-sync/regeneration; two independent Mac serial sections
≤1991	Opcode	MIDI Translator	—	Mac serial	1 In / 3 Out	standard serial; OMS Standard MIDI Interface	Classic Mac; exact range ?	OMS Standard MIDI Interface	basic self-powered serial model; predecessor to Translator II
1991	Opcode	Studio 5	—	Mac serial ×1/2	15×15 / 240 ch	OMS native; MTP emulation	?→9.x	Opcode OMS Studio 5 driver	68000-based processing; patchbay/SMPTE; networkable
1992-02	Midiman	Mac Syncman	Mac MIDI 2S	Mac RS-422 serial ×2	2 In / 6 physical Out; 32 ch	SMPTE→MTC / DTL / Smart FSK	Classic Mac OS; exact range ?	serial MIDI path; Syncman Remote DA (control)	dual 1×3 or single 1×6 routing; SMPTE reader/writer/regenerator; Steinberg rebrand: Mac MIDI 2S
1992-05/08	Midiman	MacMan	Mac MIDI I	Mac serial	1 In / 3 parallel Out	standard serial MIDI	Classic Mac OS; exact range ?	standard serial path; dedicated OMS driver ?	Steinberg rebrand shown in dedicated column; Mac MIDI I documented May 1992, Midiman MacMan by Aug 1992; Serial Thru on Midiman version
1992	Opcode	Studio 3	—	Mac serial	2 In / 6 physical Out; 32 ch addr.	OMS; SMPTE/MTC	?→9.x	Opcode OMS Studio 3 driver	2-port multiport interface + 2×6 patchbay
1992	Opcode	Studio 4	—	Mac serial	8 In / 10 physical Out; 128 ch addr.	OMS native; MTP emulation	?→9.x	Opcode OMS Studio 4 driver	OMS processing; SMPTE; up to four units
1993-02	Music Quest	MIDI Strip / MIDIstripMac	—	Mac serial	1 In / 3 Out	standard serial	Classic Mac; exact range ?	standard serial	one-piece modem/printer-port Mac interface; distinct from Music Quest PC MPU products
1993	MOTU	MIDI Time Piece II	—	Mac serial	8×8 / 128 ch	MTP; later FM / OMS-MTP path	?→9.x	FreeMIDI/MTP driver; OMS MTP driver	128 scenes; front-panel standalone operation
1993	MOTU	MIDI Express	—	Mac serial	4×6	MTP-aware / later FM	?→9.x	FreeMIDI/MOTU serial driver family	Patch matrix; LTC→MTC/DTLe sync
1993-10	Midiman	MiniMacman	Micro MIDI	Mac serial	1×1 / 16 ch	standard serial MIDI	Classic Mac OS; exact range ?	standard serial path; Steinberg MROS Mac/Falcon-compatible serial driver path	Steinberg rebrand shown in dedicated column; compact/self-powered; Micro MIDI documented by 1995
1994	Opcode	MIDI Translator II	—	Mac serial	1 In / 3 Out	standard serial; OMS Standard MIDI Interface	Classic Mac; exact range ?	OMS Standard MIDI Interface	switchable serial Thru; compact basic interface
1994	Opcode	Translator Pro	—	Mac serial ×2	2 In / 6 Out / 32 ch	standard dual-serial; OMS generic path	Classic Mac; exact range ?	OMS Standard MIDI Interface	switchable Thru; successor class to Studio Plus Two
~1994	MOTU	FastLane Serial	—	Mac serial	1 In / 3 Out	standard serial / later FM	?→9.x	FreeMIDI/MOTU serial driver family	simple non-USB FastLane; exact first retail date still ?
1996-01	MOTU	Pocket Express	—	Mac serial ×1/2	2 In / 4 Out / 32 ch	MOTU serial path; SMPTE	Classic Mac; exact floor ?	MOTU Pocket Express Mac software/driver	Mac + PC; all-format SMPTE reader/generator; front-panel controls; bypass
1996-02	Midiman	Macman PT	—	Mac serial / GeoPort	1 In / 3 Out	standard serial MIDI	Classic Mac OS; exact range ?	standard serial path; dedicated OMS driver ?	GeoPort + older 8-pin serial; self-powered; optional 9 V for PowerBook 500
≤1996-03	Opcode	Translator ProSync	—	Mac serial ×2	2 In / 6 Out / 32 ch	OMS dedicated driver; SMPTE	Classic Mac; exact range ?	Opcode OMS Translator ProSync driver	Translator Pro + SMPTE support; dedicated OMS Setup menu
1996	MOTU	MIDI Timepiece AV — serial	—	Mac serial	8×8 / 128 ch	MTP; FM; OMS-compatible path	?→9.x	FreeMIDI MTP AV serial driver; OMS path	adds ADAT, WC, video and Digidesign SuperClock sync
~1996	MOTU	micro express — serial	—	Mac serial	4×6 / 96 ch	FM / OMS-compatible apps	?→9.x	FreeMIDI MOTU serial driver family	patchbay + SMPTE-to-MIDI synchronizer
1996	MOTU	MIDI Express XT — serial	—	Mac serial	8 In / 8 addr. Out; 9 physical Out	FM / OMS-compatible apps	?→9.x	FreeMIDI MOTU serial driver family	128 ch; SMPTE/MMC; presets
1996	Opcode	Studio 5LX	—	Mac serial	15×15 / 240 ch	OMS native; MTP emulation	?→9.x	Opcode OMS Studio 5/5LX driver	16 MHz 68000; 256K RAM; 128 OMS Studio Patches; up to six networked
≤1997	Altech	MIDIFace SX	—	Mac serial	1×1 / 16 ch	standard serial	Classic Mac; exact range ?	standard serial	small self-powered member of MIDIFace line
≤1997	Altech	MIDIFace MX	—	Mac serial	1 In / 3 Out	SMPTE→MTC; SysEx-programmable filtering/remap	Classic Mac; exact range ?	standard serial + hardware programming	SMPTE reader/generator/regenerator; adjustable freewheel; serial Thru
1997	Opcode	Studio 64X	—	Mac serial	4-port / 64 ch; 6 physical Out	OMS	?→9.x	Opcode OMS Studio 64X driver	patchbay + SMPTE; successor branch to Studio 3/4 class
1998	Emagic	Unitor8	—	Mac RS-422 serial	8×8 / 128 ch	OMS driver; FreeMIDI emulation; later AMT-family stacking	7.5.3+ serial	Unitor8 OMS driver + Unitor8 Control	LTC/VITC; 32 standalone patches; up to eight per Mac serial port
1998	Opcode	Studio 64 XTC	—	Mac serial	4-port / 64 ch; 6 physical Out	OMS	?→9.x	Opcode OMS Studio 64 XTC driver	64X successor; expanded sync incl. WC/ADAT/video functions
1998	Opcode	Studio 128X	—	Mac serial	8 In / 8 addr. Out; 9 physical Out	OMS	?→9.x	Opcode Studio 128X OMS driver	128 ch + SMPTE
≤1998	KCCM	MIDIEdge	—	Mac serial ?	1×1	?	Classic Mac; exact range ?	?	listed in 1998 Mac buyer guide; primary manual/driver still missing
1999-01	Midiman	BiPort 2x4s	—	Mac serial	2 In / 4 Out / 32-in + 64-out ch	OMS; SMPTE/MTC	Classic Mac OS; exact floor ?	BiPort OMS Driver + Remote Control	GeoPort-compatible; SMPTE reader/writer/regenerator; Mac Thru
1999-02	Roland	Super MPU64 / S-MPU64	—	USB	4×4 / 64 ch	OMS; FreeMIDI module also existed	8.5+	USBSMPU64Driver + S-MPU64 OMS/FreeMIDI module	Mac driver added for iMac; predecessor to UM-4
1999-05	Midiman	MIDISPORT 2x2	—	USB	2×2 / 32 ch	OMS vendor driver	8.6–9.x	Midiman USB MIDISPORT OMS driver	period May 1999 introduction evidence; later retrospective says 2000
1999-09	Roland / Edirol	UM-2 / UM-4	SMPU32 / SMPU64 lineage	USB	2×2 / 4×4	OMS 2.3.3+ or FreeMIDI 1.35+	8.5+	model-specific OMS + FreeMIDI USB drivers	announced 1 Sep; scheduled 22 Sep 1999; UM-4 driver compatible with S-MPU64 hardware
1999-09	MOTU	FastLane-USB	—	USB	2×2 / 32 ch	FM + OMS; later MTS-capable	8.6–9.x	MOTU USB Driver + FM USB + OMS USB drivers	bus powered; MIDI Thru; first small MOTU USB model
2000-01	Emagic	AMT8	—	USB + Mac RS-422 serial	8×8 / 128 ch	AMT with Logic; OMS; FreeMIDI/MTP emulation	serial ?→9.x; USB 9.0.4+ in later shared spec	Unitor/AMT OMS driver + control software	7 rear + front port 8; standalone patching
2000	Emagic	Unitor8 MkII	—	USB + Mac RS-422 serial	8×8 / 128 ch	AMT; OMS; MTP/FreeMIDI path	7.5.3+ serial; 9.0.4+ USB	Unitor8 OMS driver + Unitor Control	flagship sync version; mixed Unitor8/AMT8 chains supported
2000-05	Midiman	MIDISPORT 4x4	—	USB	4×4 / 64 ch	OMS vendor driver	8.6+	Midiman USB MIDISPORT OMS driver	bus powered; OMS 2.3.7 included; multiple units supported
2000-06	Midiman	MIDISPORT 8x8/s	—	USB + Mac serial	8×8 / 128 ch	OMS vendor driver; SMPTE/MTC	USB 8.6+; serial 7.5+ recommended	USB MIDISPORT OMS + Serial8x8 OMS drivers	standalone patchbay; distinct USB/serial Mac driver paths
2000-07	Emagic	MT4	—	USB	2 In / 4 Out	OMS; direct Logic support	8.6.x/9.x	Emagic MT4 USB/OMS driver	small USB patchbay interface
2000-08	Midiman	MIDISPORT 1x1	—	USB	1×1 / 16 ch	OMS vendor driver	8.6/9.x family	Midiman USB MIDISPORT OMS driver	shown in Midiman’s USB MIDISPORT line by Aug 2000
2000	MOTU	MIDI Timepiece AV — USB	—	USB + Mac serial	8×8 / 128 ch	FM + OMS; MTS-capable with supporting software	8.6–9.x	MOTU USB MIDI installer + FM/OMS drivers	USB generation retains sync/network functions
2000	MOTU	MIDI Express XT — USB	—	USB + Mac serial	8 In / 8 addr. Out; 9 physical Out	FM + OMS; MTS-capable with supporting software	8.6–9.x	MOTU USB MIDI installer + FM/OMS drivers	USB successor to serial XT
2000	MOTU	micro express — USB	—	USB	4×6 / 96 ch	FM + OMS; MTS-capable with supporting software	8.6–9.x	MOTU USB MIDI installer + FM/OMS drivers	SMPTE / MMC / standalone patching
2000	Yamaha	UX256	—	USB	6 MIDI pairs + 2 TO TG; logical 16 Out / 8 In	Yamaha USB MIDI driver + OMS 2.3.6+	8.5+	YAMAHA USB MIDI Driver + OMS driver + Patch panel	up to 256 output channels; driver patch matrix
2000	Opcode	MIDIport 32	—	USB	2×2 / 32 ch	OMS	8.6/9.x?	Opcode MIDIport32 OMS driver	bus powered; multiple units; USB identity tracking
~2000	Opcode	MIDIport 96	—	USB	6×6 / 96 ch	OMS	8.6/9.x?	Opcode MIDIport96 OMS driver	larger MIDIport family member
2000	Steinberg	USB-2-MIDI	—	USB	2×2 / 32 ch	vendor Mac driver; OMS-era use	Classic Mac	Steinberg USB-2-MIDI Mac driver	bus powered; bypass/thru mode
2000	Steinberg	MIDEX 8	—	USB	8×8 / 128 ch; Out 8 duplicated	OMS driver; LTB with compatible Steinberg software	8.6/9.x	Steinberg MIDEX 8 Mac/OMS driver	LTB timestamping; period claim ≈300 µs scheduling precision
~2000	Roland / Edirol	UM-1 / UM-1S	—	USB	1×1	OMS-era vendor driver	9.x confirmed by forum driver use	Edirol UM-1 Classic-Mac driver	simple cable-style interface
2002	Steinberg	MIDEX 3	—	USB	1 In / 3 Out / 48 output ch	OMS 2.3.8+; LTB with compatible Steinberg software	8.6+	Steinberg MIDEX-3 driver; OMS 2.3.8+	bus powered; automatic Thru on In/Out 1
2002	Edirol	UM-550	—	USB	5×5 / 80 ch	separate OMS + FreeMIDI setup/driver paths	Classic Mac OS	UM-550 OMS / FreeMIDI drivers + settings	hardware patcher; HDMR/FPT
~2001/02	Edirol	UM-880	—	USB	8×8 / 128 ch	OMS driver 1.0.1 + FreeMIDI driver 1.0.1	Classic Mac OS	UM-880 OMS 1.0.1 / FreeMIDI 1.0.1	larger UM-550 sibling; standalone routing
2002-03	Midiman	USB MIDISPORT Uno	—	USB	1×1 / 16 ch	OMS	9.2.2	Uno USB driver + UNO OMS Driver; OMS 2.3.8	cable-style bus-powered 1×1; distinct from earlier MIDISPORT 1x1 box
2002-07	Digidesign	MIDI I/O	—	USB	10×10 / 160 ch	OMS; Digidesign Time-Stamping planned/supported in Pro Tools path	9.x	Digidesign MIDI I/O / OMS driver	up to four = 40 ports / 640 ch; programmable hardware Thru
2002-10	M-Audio	MIDISPORT 2x4	—	USB	2 In / 4 Out / 32-in + 64-out ch	OMS	9.2.2 for documented OS9 driver	M-Audio MIDISPORT USB/OMS driver	bus powered; MIDI Thru pushbutton
2003-06	MOTU	MIDI Express 128	—	USB	8 In / 8 addr. Out; 9 physical Out	FM + OMS; MOTU USB driver	9.x	MOTU USB MIDI installer + FM/OMS drivers	bus powered; 128 ch
2003-06	MOTU	micro lite	—	USB	5×5 / 80 ch	FM + OMS; MOTU USB driver	9.x	MOTU USB MIDI installer + FM/OMS drivers	bus powered compact interface
?	Yamaha	UX96	—	USB	1×1 DIN + TO TG/INST host port	Yamaha USB-MIDI/OMS family; exact Classic package ?	?	Yamaha model-specific USB-MIDI/OMS package ?	forum confirms direct TO HOST device connection feature
?	Yamaha	UX16	—	USB	1×1	Yamaha USB-MIDI family; exact Classic package ?	?	Yamaha model-specific USB-MIDI/OMS package ?	Classic-era model; retain ? until exact OS9 package/date is recovered
~2005	Roland / Edirol	UM-1EX / UM-2EX / UM-3EX	—	USB	1×1 / 2×2 / 3×3	vendor driver	9.2.2 user-confirmed for UM-1EX; model-specific drivers	Edirol model-specific Classic-Mac USB drivers	late Classic-Mac-compatible edge; verify exact revision before purchase

PCI / internal serial restoration — not MIDI interfaces themselves

Year	Manufacturer	Model	Connection	Ports	MIDI relevance
1999	Keyspan	SX PRO Serial Card	PCI → RS-422	4× Mini-DIN-8	1 Mbps/port; manufacturer explicitly advertised support for selected MIDI peripherals
1999/2000	Keyspan	USA-28X / Twin Serial Adapter	USB → serial	2× Mini-DIN-8	works with some serial MIDI systems but compatibility is device-specific; forum reports MTP AV better than Studio 5
1999	GeeThree	Stealth Serial Port	internal modem slot → RS-422	1× Mini-DIN-8	restores a native-like externally-clockable serial port on supported B&W G3/G4/iMac models; useful for legacy MIDI
1999/2000	MegaWolf	Remus/2 · Romulus/4 · Rufus/8	PCI → serial	2 / 4 / 8 ports	PCI serial expansion used for legacy MIDI; forum warns some MegaWolf configurations are FreeMIDI-oriented rather than universal OMS replacements

Important bridge warning: USB-to-serial is not automatically equivalent to a real Mac serial port. Emagic specifically states that USB-to-serial adapters such as the Keyspan USB Serial Adapter / Griffin iPort are unsuitable for the Unitor8 serial connection because the required external clocking is absent. Use the Unitor/AMT USB connection instead. Other serial MIDI boxes must be checked individually.

FireWire / mLAN — MIDI transported inside multifunction audio/network hardware

Year	Manufacturer	Model	Host	MIDI	Classic Mac OS	Notes
~2000	Yamaha	mLAN8P	IEEE-1394 / mLAN	MIDI + audio over mLAN; physical MIDI I/O	8.6–9.2.2 forum report; mLAN driver ≤1.04 + mLAN Mixer	first-generation mLAN; not a MIDI-only interface
2004	Yamaha	i88X	IEEE-1394 S400 / mLAN	mLAN MIDI ports + physical MIDI I/O	9.2; OMS 2.3.8 + mLAN Tools	Yamaha explicitly documents Mac OS 9 for i88X/mLAN16E; MY16-mLAN excluded from OS9

Continued in Post 2 — Details

[smilesdavis]

Macintosh MIDI Interfaces — Serial / USB / PCI / FireWire / MIDI LAN Timeline — Post 2: Details

Classic Mac MIDI architecture

• USB: Mac OS 9 is not a modern class-compliant USB-MIDI environment. A period device normally needs its manufacturer extension/driver and then OMS, FreeMIDI, or a vendor-specific layer. This explains why a modern class-compliant controller can trigger the Mac’s “look for a driver” behavior instead of simply appearing as a MIDI endpoint.
• OMS and FreeMIDI can coexist. MOTU provided an OMS Emulator in FreeMIDI; compatibility was not always identical to native OMS. Conversely, Opcode Studio 4/5 could be used from FreeMIDI through MTP emulation, but some Opcode-specific processing/control was then lost.
• Timestamp systems are ecosystem-specific. MOTU MTS, Emagic AMT and Steinberg LTB all improve scheduling by delivering data early with timing information and letting the interface transmit it at the intended instant, but applications must support the respective scheme. Do not label every USB MIDI application “timestamped” merely because the hardware can do it.
• Serial interfaces divide into simple 16-channel-per-Mac-port designs and intelligent multi-port boxes. MacOS9Lives users correctly warn that a box with several physical DIN sockets is not automatically a multi-port protocol device; processor/driver support is what creates independently addressable ports over one serial connection.
• OMS 2.3 explicitly includes a generic Standard MIDI Interface driver for conventional Macintosh serial boxes and names Opcode MIDI Translator / Studio Plus Two as examples. Intelligent interfaces such as Studio 3/4/5/64X and Translator ProSync use dedicated OMS drivers instead.

Sources: MacOS9Lives — generic USB MIDI discussion · Sound On Sound — FreeMIDI & OMS · Sound On Sound — timestamped MIDI timing · MacOS9Lives — serial architecture discussion · Opcode OMS 2.3 manual — driver table

Southworth JamBox/4 / JamBox/4+ — 1986–87

• JamBox/4: documented in 1986 as a Macintosh-oriented four-input MIDI/SMPTE interface. It predates the later “+” revision and pushes this timeline back before 1987.
• JamBox/4+: reviewed Oct 1987 as the updated Macintosh model: 4×4 MIDI, 64-channel addressing with compatible software/high-speed mode, four-input merge, routing, filtering/rechannelizing, SMPTE read/generate and SMPTE→MTC/DTL synchronization.
• Mac control is via Southworth software/Desk Accessory rather than a later OMS-style universal driver. Exact System-version range remains ?.

Sources: Home & Studio Recording Aug 1986 — JamBox/4 · Electronic Musician Oct 1987 — JamBox/4+ review · Music and the Macintosh 1989

Apple MIDI Interface A9M0103 — 1987

• Apple’s own interface brochure is dated Dec 1987. Hardware is one MIDI In + one MIDI Out and one Mini-DIN-8 serial connection; the box is self-powered and was sold for Macintosh and Apple IIGS.
• This is a conventional single-port serial interface; later OMS can use conventional serial hardware through the Standard MIDI Interface path, but an Apple-specific OMS driver has not been recovered.

Sources: Apple MIDI Interface brochure — Dec 1987 · Apple MIDI Interface Owner’s Guide

Opcode early serial family — Professional Plus / Studio Plus Two / MIDI Translator

• Professional Plus: already advertised Aug/Sep 1987. Later period user documentation identifies it as 1 In / 3 Out at the normal 1 MHz Mac serial rate. An Apr 1988 buyer guide gives 1 In / 4 Out; retain the 1×3 architecture used in later direct reports and note the early count conflict rather than silently merging it.
• Studio Plus Two: already advertised in 1987; two independent Mac serial sections, normally documented as 2 In / 6 Out / 32 channels with printer/modem bypass. Some early buyer material counts eight Outs, so physical-count wording in very early literature is inconsistent.
• MIDI Translator: by 1991, the budget Opcode 1 In / 3 Out serial interface. OMS 2.3 later explicitly names “MIDI Translator” and “Studio Plus Two” as examples handled by the generic Standard MIDI Interface driver.

Sources: Washington Apple Pi Sep 1987 — Opcode hardware · Music and the Macintosh 1989 · 1990 period user notes — Professional Plus / Studio Plus Two · Music Technology Sep 1991 — Translator · Opcode OMS 2.3 manual

Argents Mini MIDI Communicator / MIDI Communicator

• SOS Apr 1988 buyer guide lists Mini MIDI Communicator=1 In / 4 Out and MIDI Communicator=2 In / 8 Out.
• 1989 hands-on coverage describes the larger unit as two Mac serial connections feeding two banks of four MIDI Outs, with two Ins and printer/modem pass-through; the two output banks can split the load between the Mac’s serial ports.

Sources: SOS Apr 1988 buyer guide · Music Technology Jun 1989 — interfaces

Passport Macintosh interfaces — basic interface / MIDI Transport

• Macintosh MIDI Interface: 1987/88 catalog material gives 1 In / 1 Out for 128K/512K/Mac Plus. A 1992 Macintosh hardware book describes a Passport 1 In / 3 Out interface. This pass did not prove whether that is a later revision, a renamed model, or a source conflation; overview therefore preserves the conflict.
• MIDI Transport: 2 In / 4 Out, connects to both Mac serial ports, reads/writes SMPTE, converts SMPTE→MTC/DTL and FSK→MIDI Song Pointer.

Sources: Mix Bookshelf 1987–88 — Passport Macintosh MIDI Interface · Music and the Macintosh 1989 — MIDI Transport · The Audible Macintosh 1992 — later Passport interface description

Sonus MacFace

• Period 1987/88 product material lists MacFace as a Macintosh 2-In/6-Out interface. A separate power supply permits stand-alone MIDI-Thru use; later Macintosh documentation again describes 2 In / 6 Out and activity indication for both Mac serial ports.

Sources: Mix Bookshelf 1987–88 · Music and the Macintosh 1989

Lone Wolf MIDITap / MediaLink — 1989

• MIDITap combines 4 MIDI Ins + 4 MIDI Outs, an RS-422/RS-232 computer port and two MediaLink fibre connectors. The proprietary network runs up to 2 Mb/s and provides routing, merging, filtering and programmed MIDI responses.
• The 1989 launch article says Macintosh/PC network-management software was under development; 1990–93 studio equipment lists document MIDITap in Macintosh systems. Exact Classic-Mac software/version/driver archive remains ?.

Sources: Music Technology Oct 1989 — MediaLink/MIDITap · Music Technology Oct 1990 — Mac IIcx studio with MIDITap · Electronic Musician Feb 1993 — Mac IIx/MIDITap studio list

JL Cooper Macintosh serial family — SyncMaster / MacNexus / Sync-Link

• SyncMaster: manufacturer directory gives introduction date Jan 1990. Dual-port Mac interface/synchronizer: 2 In / 6 Out, modem/printer Thru, SMPTE read/generate/regenerate, MTC, DTL and Smart FSK.
• MacNexus: announced in period press Oct 1990; 1991 review describes it as a basic 1 In / 3 Out Macintosh serial interface.
• Sync-Link: reviewed Sep 1991. Uses both serial ports as two independent MIDI sections, giving 2 In / 2 Out / 32 channels; adds SMPTE/FSK, MTC, DTL, MIDI Clock, free-run, jam sync and regeneration. Configuration uses a Macintosh Desk Accessory.

Sources: Mix Oct 1990 directory — SyncMaster introduced 1/90 · SOS Oct 1990 — MacNexus · Music Technology Sep 1991 — Sync-Link

Anatek Pocket Mac

• 1991 NAMM-era coverage describes Pocket Mac as a new 1-In/2-Out Macintosh MIDI interface. Later buyer material confirms 16 channels, MIDI activity LEDs and self-powered operation.

Sources: Keyboard Apr 1991 — Pocket Mac · 1997 Mac MIDI interface roundup

Altech MIDIFace family — LX / EX / SX / MX

• LX: 1 In / 3 Out, self-powered, MIDI activity LED. EX: same 1×3 architecture plus serial Thru switch. EX is advertised as new in 1991; both are described in 1992 Mac hardware documentation.
• SX: 1×1 / 16 channels, self-powered. MX: 1 In / 3 Out plus serial Thru, SMPTE reader/generator/regenerator, SMPTE→MTC, adjustable freewheel/stop detection and SysEx-programmable channel remapping/message muting.
• DX: 1997 roundup says 2 In / 6 Out and “will be released later this year.” No shipment/manual proof recovered yet, so DX stays WIP rather than being promoted to the chronology.

Sources: A+ May 1991 — new MIDIFace EX · The Audible Macintosh 1992 — LX/EX · The Mix Dec 1994 — LX/EX · 1997 Mac MIDI interface roundup — SX/MX/DX

Music Quest MIDI Strip — 1993

• A Feb 1993 Music Quest ad documents the Macintosh MIDI Strip as a 1-In/3-Out serial-port interface for the modem or printer port. 1996/98 period listings continue to identify MIDIstrip as the low-cost Mac model.
• Do not pull Music Quest 2Port/SE, 2Port/SX or MQX-32M into the Mac chronology merely because some buyer-guide tables place them near the Mac section; their normal product documentation is PC-oriented. MIDI Strip is the confirmed Mac-specific model here.

Sources: Electronic Musician Feb 1993 — Music Quest ad · Mechanical Music Digest Jul 1996 — MIDI Strip for Macintosh · The Mix May 1998 buyer guide

MOTU MIDI Time Piece I — 1990

• Period Sound On Sound review identifies it as MOTU’s first hardware: 8×8 MIDI interface/network + SMPTE synchronizer for Macintosh; 128 independently addressable channels.
• Two MTPs can be linked on one Mac serial port; using both Macintosh serial ports allowed four units / 32 independent MIDI ports / 512 channels in the original architecture.
• The multi-port advantage requires MTP-aware software; non-aware software sees a conventional serial MIDI path.

Sources: SOS Sep 1990 · Music Technology Jan 1992

MOTU MIDI Time Piece II — 1993

• 8×8 / 128 channels; adds 128 routing/processing scenes, front-panel editing/LCD and standalone operation.
• Period review explicitly compares it with Opcode Studio 5/4 and documents the multi-port MTP architecture.

Source: SOS Feb 1993

MOTU MIDI Express — 1993

• Period Mac coverage describes a 4×6 multi-port matrix with memories and LTC→MTC/DTLe synchronization. It belongs to the Express branch, not the Timepiece networking branch.

Source: SOS Mar 1993 Apple Notes

MOTU FastLane Serial

• MacOS9Lives serial overview records the non-USB FastLane as a simple 1-In/3-Out serial interface. Exact first retail date still needs a primary-source lock; retain ~1994 rather than inventing a precise month.

Source: MacOS9Lives serial-interface corpus

MOTU Pocket Express — 1996

• Advertised as a new product by Jan 1996; 2 In / 4 Out / 32 channels. On Macintosh it can use either or both serial ports; PC uses the parallel port.
• Includes all-format SMPTE reader/generator with jam sync and front-panel controls. Computer Bypass passes MIDI with the computer off. No need to infer it from later Express hardware: contemporary MOTU advertising documents the Mac connection directly.

Sources: Electronic Musician Jan 1996 — new Pocket Express ad · Electronic Musician May 1996 — product report

MOTU MIDI Timepiece AV — serial

• Period 1996 MOTU advertising calls it the new MIDI Timepiece for ADAT, Pro Tools and video: MIDI + SMPTE/video genlock + ADAT Sync + word clock + Digidesign SuperClock.
• 8×8/128-channel Timepiece architecture; networkable within the Timepiece family. MacOS9Lives correspondence with MOTU states the Timepiece line, not Express boxes, is the MOTU Timepiece-network branch.

Sources: Mix Aug 1996 · MacOS9Lives

MOTU micro express — serial

• Forum owner report identifies the original Macintosh model as 4-input/6-output MIDI interface, MIDI patchbay and SMPTE-to-MIDI synchronizer connected to the Mac modem/printer serial port. Later FreeMIDI packages include the driver family.

Source: MacOS9Lives — owner report

MOTU MIDI Express XT — serial

• 1996/97 period product generation: 8 inputs, 128 addressable output channels, 9 physical output jacks, SMPTE/MMC and front-panel presets. The later USB XT is a separate host-connection revision.

Sources: MacOS9Lives serial overview

MOTU FastLane-USB — 1999

• Shipping by Sep 1999. 2×2 / 32 channels; bus powered; Thru operation without computer.
• Mac manual: Mac OS 8.6/9; installer supplies MOTU USB Driver, FreeMIDI USB Driver and OMS USB Driver; FreeMIDI and OMS are both supported.
• Period Electronic Musician testing documents hardware MIDI Time Stamping support; timestamp benefit depends on compatible software, notably Digital Performer.

Sources: Sweetwater Sep 1999 · MOTU Mac manual

MOTU USB rack family — 2000

• MIDI Timepiece AV USB, MIDI Express XT USB and micro express moved the established MOTU rack family to USB while retaining model-specific sync/patching functions. Period MacOS9Lives material records Mac OS 8.6+ for MOTU USB MIDI devices.
• MOTU’s Mac manual architecture supports mixing multiple MOTU USB MIDI interfaces on one USB system through hubs. MTS is a capability of the USB generation when paired with supporting software, not a universal OMS feature.
• micro express=4×6 / 96 channels. Express XT=8 independently addressable output ports with an extra physical output jack. MTP AV=8×8 / 128 channels plus high-end sync.

Sources: MacOS9Lives USB-interface corpus · MOTU USB Mac architecture

MOTU MIDI Express 128 / micro lite — 2003

• Both announced/shipping June 2003 with Mac OS 9 and X support: Express 128=8 In / 8 addressable Out (9 physical Out), 128 channels; micro lite=5×5 / 80 channels; both USB bus powered.

Sources: MacMusic 2 Jun 2003 · MacMusic 20 Jun 2003

Opcode Studio 5 — 1991/92

• Launch is identified by contemporary MOTU coverage as 1991; detailed SOS review followed Apr 1992. 15 MIDI Ins + 15 Outs = 240 independently addressable channels under OMS/MTP-aware software.
• Dedicated 68000 processing allows routing, splitting, transposition, filtering/mapping and stored patches; SMPTE reader/generator; either or both Mac serial ports can be used.
• Later firmware/OMS material supports networking multiple Studio 5s; forum/manual evidence records up to six = 1,440 MIDI channels.

Sources: SOS Apr 1992 · SOS Feb 1993 · MacOS9Lives

Opcode Studio 3 / Studio 4 — 1992

• Period 1992/93 coverage: Studio 3=2-port/32-channel computer interface with 2×6 physical patchbay and SMPTE; Studio 4=8×8/128-channel intelligent interface with the same OMS processing concept as Studio 5.
• Studio 4 supports MTP emulation and multiple-unit expansion; MacOS9Lives documentation/manual excerpts record 10 physical Out sockets and up to four units / 512 channels.

Sources: SOS Jan 1993 · MacOS9Lives

Opcode MIDI Translator II / Translator Pro / Translator ProSync

• MIDI Translator II: 1 In / 3 Out with switchable serial Thru. Translator Pro: dual-port 2 In / 6 Out / 32 channels with switchable Thru. Both appear as current Mac interfaces in mid-1990s period material.
• Translator ProSync: adds SMPTE support. OMS 2.3 explicitly provides a dedicated Translator ProSync driver/menu, while ordinary Translator-class interfaces use the generic Standard MIDI Interface path.

Sources: The Mix May 1998 buyer guide · MacOS9Lives archived Opcode product links · Opcode OMS 2.3 manual

Opcode Studio 5LX — 1996

• 15×15 / 240-channel Studio 5 evolution. Forum/manual evidence records 16 MHz 68000, 256K RAM, 128 OMS Studio Patches, standard/fast communication, MTP emulation and networking of up to six units.

Source: MacOS9Lives serial corpus

Opcode late serial family — Studio 64X / 64 XTC / 128X

• Studio 64X (1997): 64-channel multi-port interface/patchbay/SMPTE unit; four independently addressable port groups, with additional physical Out duplication.
• Studio 64 XTC (1998): 64X successor with expanded synchronization. Its 1998 manual is contemporary primary documentation.
• Studio 128X (1998): eight addressable input/output ports / 128 channels; manual exposes In 1–8 and Out 1–8 plus sync/control/broadcast endpoints. Period Opcode advertising shows the 8-In/9-physical-Out layout.

Sources: The Mix 1998 buyer guide · 64 XTC manual · Studio 128X manual

Opcode MIDIport USB family

• MIDIport 32=2×2/32 channels, USB bus power, OMS and persistent USB identity intended to prevent port/device renumbering between boots. Multiple units supported.
• MIDIport 96=6×6/96-channel larger sibling appearing in period Opcode product material. Exact first-ship date remains less secure than MIDIport32; retain ~2000.

Source: MacOS9Lives USB corpus with archived Opcode material

Emagic Unitor8 — 1998

• Period Dec 1998 review: 8 inputs/8 outputs; RS-422 Mac serial; RS-232 PC; OMS support; FreeMIDI emulation; fast up to 4 MHz vs normal 1 MHz communication; LTC/VITC; standalone patches.
• Later shared Unitor/AMT documentation establishes Mac serial operation from OS 7.5.3+ and stacking up to eight interfaces per serial chain.

Sources: The Mix Dec 1998 · shared Unitor manual

Emagic AMT8 — 2000

• 8×8; seven pairs rear + port 8 on front; USB + RS-422 Mac serial + RS-232 PC; patch mode. Unlike Unitor it omits the full LTC/VITC sync hardware.
• AMT sends time-qualified MIDI ahead of schedule for interface-timed output when used with compatible software such as Logic. OMS/FreeMIDI paths remain available but AMT should not be assumed in non-AMT applications.

Source: SOS Jan 2000

Emagic Unitor8 MkII — 2000

• Electronic Musician Apr 2001 explicitly says Emagic introduced the MkII “last year,” establishing 2000 rather than 2001 as the introduction year.
• 8×8/128ch; USB + RS-422 serial; AMT; professional LTC/VITC sync. Shared technical spec: serial Mac OS 7.5.3+; USB Mac OS 9.0.4+.
• Dedicated OMS driver is important: the generic OMS MTP driver sees only the first Unitor-family unit and runs it at slow 1 MHz; the Emagic OMS driver supports the chain/full feature set. Unitor8 MkII, AMT8 and original Unitor8 may be stacked in mixed chains.
• Do not use a generic USB-to-serial adapter as a substitute for the Unitor serial port; Emagic documents the missing external-clock problem.

Sources: Electronic Musician Apr 2001 · Unitor8/AMT8 manual

Emagic MT4 — 2000

• Period July 2000 review: USB, 2 MIDI In / 4 MIDI Out, Mac OMS/Logic support and standalone patchbay operation. It is the compact member below AMT8/Unitor8.

Source: MEMI 25 Jul 2000

Steinberg USB-2-MIDI — 2000

• Period Electronic Musician Sep 2000: 2×2 cross-platform USB, bus powered, with bypass mode. MacOS9Lives users later reported hardware/driver kinship with MIDISPORT 2x2; treat that as a forum report, not as proof that every revision is electrically identical.

Sources: Electronic Musician Sep 2000

Steinberg MIDEX 8 — 2000

• 8 independent MIDI input/output pairs, 128 channels; output 8 is physically duplicated. USB host connection.
• LTB=Linear Time Base: timestamped events are sent early and emitted by the interface at the intended song time. Period launch material advertised ≈300 µs scheduling precision; this requires compatible Steinberg software and must not be confused with generic OMS timing.
• Announced/shown in 2000; late-2000 reports show availability timing varying by platform/market. The hardware generation belongs in 2000 rather than being blindly dated 2001 from later driver threads.

Sources: Electronic Musician Sep 2000 · MIDEX 8 manual · period Steinberg announcement

Steinberg MIDEX 3 — 2002 era

• 1 input + 3 independent outputs = 48 output channels; USB bus powered; automatic MIDI Thru on In/Out 1 when software is not using the interface.
• Manual: Mac OS 8.6+ and OMS 2.3.8+; LTB available with compatible Steinberg applications.

Source: MIDEX 3 operation manual

Midiman Macintosh serial family — Mac Syncman / MacMan / MiniMacman / Macman PT + Steinberg rebrands

• Mac Syncman / Steinberg Mac MIDI 2S: the Steinberg Mac MIDI 2S is the red Steinberg-branded/repackaged counterpart to Midiman’s Mac Syncman and is therefore cross-referenced in its own chronology column rather than counted as a separate interface design. The Midiman Mac Syncman is shown by Feb 1992 when Midiman entered the Macintosh market. It is a professional 1 MHz RS-422, 2-In/6-Out interface + sync box. The six Outs represent two independent 1-In/3-Out serial-interface channels, one tied to the modem port and one to the printer port, for 32 MIDI channels total; routing can also be switched to a single 1-In/6-Out configuration.
• Mac Syncman adds SMPTE read/write, reshaping/regeneration, Jam Sync/flywheel functions and SMPTE→MTC, Direct Time Lock and Smart FSK synchronization. The two Serial Thru switches can bypass the interface independently to preserve printer/modem access.
• Syncman Remote: released as a Macintosh desk accessory by Feb 1993; it controls Syncman-family write offset, start/stop striping, SMPTE format and user bits. This is sync/control software, not proof of an OMS multiport driver.
• MacMan / Steinberg Mac MIDI I: Steinberg Mac MIDI I is the Steinberg-branded/repackaged MacMan counterpart. Steinberg’s Mac MIDI I was announced with Mac Cubase in May 1992 as 1 MIDI In + 3 parallel MIDI Outs; Midiman’s MacMan appears in period coverage by Aug 1992 and has the same 1-In/3-Out architecture. Midiman’s FCC equipment authorization had already been granted 7 Feb 1992. The Midiman-branded unit adds/advertises Serial Thru bypass to the attached printer/modem. Record these as rebrand/OEM equivalents rather than two independent interface designs.
• MiniMacman / Steinberg Micro MIDI: Steinberg Micro MIDI is the Steinberg-branded/repackaged MiniMacman counterpart. Midiman’s MiniMacman is the compact, self-powered 1-In/1-Out Macintosh serial interface documented from 1993. Steinberg’s Micro MIDI is the rebranded/repackaged version; Steinberg’s April 1995 readme identifies it as a Macintosh interface also usable from the Falcon LAN port with Steinberg’s MROS LANPORT driver. Later buyer-guide material describes the Steinberg Micro MIDI as Mac 1-In/1-Out, portable, and requiring no power supply — matching the MiniMacman architecture. Do not count it as a separate hardware design.
• Macman PT: new 1996 revision for GeoPort-era Macs while retaining compatibility with older 8-pin serial Macs. It is self-powered, has an optional 9 V input for machines such as the PowerBook 500, and works as a hardware MIDI Thru box when not acting as the Mac interface. The interface itself remains 1 In / 3 Out.
• Rebrand notation: The chronology keeps Midiman as the canonical manufacturer/model and puts the Steinberg retail names in a separate Steinberg rebrand column: Mac Syncman → Mac MIDI 2S; MacMan → Mac MIDI I; MiniMacman → Micro MIDI. Period material establishes matching names/specifications and the rebrand relationship used here; keep any deeper PCB/OEM-manufacturing claim separate unless a primary manufacturing document is recovered.
• Classic-OS caution: period sources establish Macintosh serial compatibility, but this pass did not recover a model-specific OS-version floor/ceiling or a dedicated OMS driver for MacMan/MiniMacman/Macman PT. Keep those fields as ? rather than inheriting requirements from later MIDISPORT products.

Sources: Studio Sound Feb 1992 — Mac Syncman launch-era evidence · Electronic Musician Aug 1992 — MacMan/Mac Syncman · Mac Syncman manual · Electronic Musician Feb 1993 — Syncman Remote · Sound & Communications Oct 1993 — MiniMacman introduction · EQ Feb 1996 — Macman PT · SOS Apr 1996 — Macman PT release · Music Technology May 1992 — Steinberg Mac MIDI 1 + Mac MIDI 2S · Studio Sound Apr 1992 — Steinberg Mac MIDI 1 / 2S · Steinberg Apr 1995 Micro MIDI readme reproduction · Electronic Musician 2001 buyer guide — Steinberg Micro MIDI
Midiman BiPort 2x4s — 1999

• Period Jan 1999 advertising presents the BiPort 2x4s as part of Midiman’s “fall lineup”: dual-platform Mac/PC, 2 MIDI In + 4 independent MIDI Out = 32 input / 64 output channels, plus a stand-alone SMPTE reader/writer/regenerator.
• Mac host connection is a standard serial cable to the printer or modem port; the unit auto-detects Mac/PC and is Apple GeoPort compatible. A Mac Thru switch bypasses the unit so the serial peripheral remains reachable.
• The Mac side is explicitly OMS-based. The manual says the BiPort OMS Driver is required to use it as a multiport MIDI device; the package also supplied Macintosh Remote Control software for SMPTE user bits, frame format, flywheel, write offset and start/stop writing.
• Supported SMPTE formats: 24, 25, 29.97, 30-drop and 30 non-drop; multiple BiPort units may operate simultaneously. Exact Classic-Mac OS floor was not recovered from the period manual, so keep it ?.

Sources: Electronic Musician Jan 1999 — Midiman fall lineup · BiPort 2x4s manual

Midiman/M-Audio MIDISPORT family

• MIDISPORT 2x2 date correction: The Mix May 1999 already describes the USB MIDISPORT 2x2 as a new Midiman product for Mac/PC. A much later M-Audio Anniversary retrospective says “first introduced in 2000”; for this timeline’s “first defensible introduction evidence” rule, use 1999-05 and preserve the retrospective conflict in Details rather than moving the first-public-evidence date forward.
• 2x2 early Mac package: Mac OS 8.6 + OMS. Period Midiman installation material identifies the USB MIDISPORT extension/shim + OMS-driver architecture; the 2x2 also has a hardware USB/MIDI Thru switch that routes In A→Out A and In B→Out B when USB is bypassed.
• 4x4: period release coverage appears by May/July 2000. 4×4/64 channels each direction, USB bus powered, expandable with additional units. Manual floor is Mac OS 8.6+ with OMS; period CD documentation includes OMS 2.3.7. The German installer sheet names MidiSport4x4Installer 1.0 and says Indigo/Ruby/Graphite/Snow/Sage iMacs, Cube and dual-processor G4s require driver 1.04.
• 8x8/s: Midiman announced it 15 Jun 2000 as the MIDISPORT flagship. 8×8/128ch, USB and legacy serial, full SMPTE, standalone patchbay. Manual: USB requires Mac OS 8.6+ and OMS; serial operation recommends Mac OS 7.5+. USB and serial use distinct Mac driver paths. Early documentation identifies separate USB extension/shim + OMS driver versus a Serial8x8 OMS driver.
• 1x1 date correction: the compact USB MIDISPORT 1x1 is already pictured/listed in Midiman’s USB MIDISPORT family in Jul/Aug 2000 advertising, and a German 1x1 installation document is dated 9/2000. Use 2000-08, not 2001, as the conservative first-period product evidence in this pass.
• Uno: announced at Musikmesse by Mar 2002. Cable-style, bus-powered 1×1/16ch USB interface. Its Classic-Mac manual explicitly supports Mac OS 9.2.2, requires OMS for OS9, and installs OMS 2.3.8 plus a dedicated UNO OMS Driver. Do not merge Uno with the earlier box-form MIDISPORT 1x1.
• MIDISPORT 2x4: M-Audio press release dated 28 Oct 2002: 2 independent Ins/32 input channels + 4 Outs/64 output channels, USB bus powered. The documented OS9 driver branch requires Mac OS 9.2.2 + OMS; 2x4 also has the hardware MIDI Thru pushbutton.
• Early vs later OS9 drivers: do not overwrite the original 8.6-era MIDISPORT requirements with the later unified M-Audio package. Later documentation for the combined 1x1/2x2/2x4/4x4 driver branch requires 9.2.2 and installs M-Audio USB MIDI Support + M-Audio USB OMS Support. That is a later driver generation, not evidence that the earlier 2x2/4x4 could never run 8.6.
• Wayback driver evidence: the archived Midiman driver tree includes the exact captured path usbmac104.sea.hqx — 19 Aug 2000 Wayback capture. A MacOS9Lives recovery report describes that archived package as the early Mac USB 1.04-era bundle; until the binary itself is unpacked here, keep its internal file/version details attributed rather than treating them as independently verified package forensics.
• Revision warning: MacOS9Lives contains conflicting reports for the later green/black “Anniversary” 2x2: one MDD user report says it works; another owner reports failure with the OS9 package; another forum report says the Anniversary hardware changed during production. Therefore “MIDISPORT 2x2” is not enough identification when buying for OS9 — photograph/revision matters.

Archive roots: midiman.net/* · www.midiman.net/* · midiman.com/* · www.midiman.com/* · midiman.net drivers/*
Sources: The Mix May 1999 — new MIDISPORT 2x2 · Sweetwater 22 May 2000 — 4x4 release · reproduced Midiman 15 Jun 2000 8x8/s announcement · M-Audio Anniversary retrospective · MIDISPORT 4x4 manual · Midiman 4x4 Mac installation sheet · MIDISPORT 8x8/s manual · EQ Aug 2000 — complete MIDISPORT line · Midiman 1x1 installation sheet 9/2000 · Musikmesse 2002 — Uno · Uno manual · M-Audio MIDISPORT 2x4 press release — 28 Oct 2002 · later unified MIDISPORT manual · MacOS9Lives revision/driver reports

Yamaha UX256 — 2000

• Hardware: six MIDI IN/OUT pairs + two TO TG serial-host ports. The driver exposes up to 16 output ports / 256 output channels and 8 input ports / 128 input channels because each TO TG port can address multiple logical ports on compatible Yamaha “TO HOST” devices.
• Mac manual: Mac OS 8.5+ on USB iMac/G3/G4; OMS 2.3.6+; installs YAMAHA USB MIDI Driver, YAMAHA USB MIDI OMS Driver and USB MIDI Patch control panel.
• Multiple UX256s are supported through USB hubs; the manual documents up to 32 units as a theoretical supported configuration subject to the operating environment.

Sources: Yamaha UX256 manual

Yamaha UX96 / UX16

• UX96 forum evidence is useful because its TO TG/INST connector can directly attach MIDI devices equipped with the older serial “TO HOST” interface. This is not just an extra DIN MIDI port.
• Yamaha still indexes period manuals for UX96 and UX16, but this pass did not recover a sufficiently explicit model-specific Classic-Mac OS driver requirement to remove the ? from those rows. Do not inherit the UX256 OS floor by assumption.

Sources: MacOS9Lives — UX96 addition · Yamaha manual archive

Roland / Edirol early USB family — Super MPU64 / UM-1 / UM-2 / UM-4

• Super MPU64 / S-MPU64: Mac support is explicitly dated Feb 1999: Roland added an iMac driver and specified Mac OS 8.5+. Contemporary Macworld coverage calls it the first Mac-compatible USB MIDI interface to reach the street: 4×4 / 64 channels, OMS path.
• UM-2 / UM-4 date correction: announced 1 Sep 1999 for 22 Sep release — not 2000. Roland specifies Windows 98 or Mac OS 8.5+, with OMS 2.3.3+ or FreeMIDI 1.35+. UM-2=2×2; UM-4=4×4; up to four units may be combined through USB hubs.
• Super MPU64 → UM-4 driver transition: the UM-4 manual explicitly says the UM-4 Driver is compatible with S-MPU64 hardware, but the old S-MPU64 driver and UM-4 driver cannot be installed simultaneously. It instructs users to remove USBSMPU64Driver and the SMPU64 Driver FreeMIDI module before installing the UM-4 driver.
• Roland’s surviving archive lists UM-4 OMS Driver 2.0.1 and UM-4 FreeMIDI Driver 2.0.1 for classic Mac OS.
• UM-1 / UM-1S: 1×1 cable-interface branch. MacOS9Lives preserves Classic-Mac driver troubleshooting and successful OS9 use; exact first-release date/package remains less secure than UM-2/4.

Sources: PC Watch 8 Feb 1999 — Super MPU64 Mac/iMac support · Macworld Jun 1999 — Super MPU64 Mac USB · ASCII.jp 1 Sep 1999 — UM-2/UM-4 announcement · Roland UM-4 Owner’s Manual · Roland legacy driver archive · MacOS9Lives USB corpus

Edirol UM-550 / UM-880

• UM-550=5×5/80ch USB interface + standalone hardware patcher. UM-880=8×8 larger sibling. Roland’s surviving UM-880 support page still lists both “FreeMIDI Driver Version 1.0.1 for Macintosh” and “OMS Driver Version 1.0.1 for Macintosh.”
• Shared owner documentation has separate Classic-Mac setup paths for OMS and FreeMIDI; do not treat one settings file as interchangeable with the other.

Sources: Roland UM-550 · Roland UM-880 driver archive · UM-550/880 manual

Edirol UM-xEX late USB family

• MacOS9Lives retains OS9-era driver/user evidence for UM-1EX, UM-2EX and UM-3EX. UM-1EX has a direct 9.2.2 success report; keep model/revision-specific driver packages with the hardware rather than assuming a generic Roland USB-MIDI driver.

Source: MacOS9Lives USB corpus

KCCM MIDIEdge

• The Mix 1998 Mac buyer guide lists a KCCM MIDIEdge as a 1-In/1-Out Macintosh interface. The same guide separately lists PC MIDIEdge card variants, so the Mac row should not be conflated with those PC cards. Exact Mac host connector, first date and Classic driver are still ? pending primary documentation.

Source: The Mix Dec 1998 buyer guide

Digidesign MIDI I/O — 2002

• Shipping July 2002: 10 MIDI inputs + 10 outputs / 160 channels; USB powered; programmable hardware Thru; OMS compatible outside Pro Tools as well.
• Up to four units may be attached for 40 I/O ports / 640 channels. Digidesign announced its own Time-Stamping path for improved Pro Tools timing.

Sources: MacMusic Jul 2002 · Sweetwater Sep 2002

Keyspan serial restoration

• SX PRO (1999): four RS-422 Mini-DIN-8 ports on PCI; up to 1 Mbps each; Keyspan explicitly advertised support for selected MIDI peripherals. Macworld later catalogued it as a four-port PCI-to-serial solution for PCI Macs.
• USA-28X/Twin Serial: USB-to-two-serial bridge. MacOS9Lives preserves driver v1.9 and user tests: MTP AV can work, while Studio 5 behavior is reported as spotty. Treat it as a compatibility matrix item, not a universal “serial port replacement.”

Sources: Keyspan 1999 press release · Macworld UK Jul 2000 · MacOS9Lives USA-28X reports

GeeThree Stealth Serial Port

• Internal modem-slot adapter restoring an RS-422 Mini-DIN-8 serial port on supported B&W G3, early G4 and some iMac systems. Period coverage specifically notes support for externally clocked serial peripherals such as MIDI devices and existing serial drivers/Comm Toolbox.
• It is not a PCI card and must not be lumped into the Keyspan/MegaWolf PCI group.

Sources: ATPM Aug 2000 · TidBITS Mar 2000

MegaWolf PCI serial family

• Macworld Jul 2000 catalogues Remus/2=2 ports, Romulus/4=4 ports, Rufus/8=8 ports, all PCI-to-serial products. These are host expansion devices used to attach legacy serial MIDI boxes rather than MIDI interfaces themselves.
• MacOS9Lives contains both useful MIDI use reports and extension/OMS-vs-FreeMIDI caveats. Preserve the specific card driver with the hardware; do not assume every MegaWolf driver exposes an OMS-compatible “native Mac port” in the same way.

Sources: Macworld UK Jul 2000 · MacOS9Lives Board 42 corpus

Yamaha mLAN8P

• MacOS9Lives user documentation reports Mac OS 8.6–9.2.2 with early mLAN driver 1.04-or-earlier plus mLAN Mixer from the original CD. Because this is first-generation mLAN and the exact surviving package is difficult to recover, keep the driver version paired with the report rather than generalizing from later Yamaha mLAN Tools.

Source: MacOS9Lives — Audio Interfaces with MIDI I/O

Yamaha i88X / mLAN16E — Mac OS 9 mLAN

• Yamaha explicitly documents Mac OS 9 support for i88X and mLAN16E; MY16-mLAN is explicitly excluded from Mac OS 9 in the same guide.
• Mac OS 9.2; built-in S400 FireWire; installs mLAN Tools / Auto Connector / Graphic Patchbay plus OMS 2.3.8. OMS is required for MIDI/remote-control data over the mLAN network.

Source: Yamaha i88X/mLAN16E Tools installation guide

WIP / unresolved

• Altech MIDIFace DX — announced in the 1997 roundup as forthcoming 2 In / 6 Out; shipment/manual proof still ?.
• Steinberg Micro Mac — 1998 Mac buyer guide lists 1 In / 1 Out; exact manufacturer/OEM relationship, first date and driver still ?.
• Passport simple Mac interface revision — 1987/88 source=1×1; 1992 source=1×3. Need model/revision proof before splitting or merging.
• Anatek Pocket Plus — period Anatek material mentions a Macintosh interface with MIDI merging; exact I/O/release documentation still ?.
• KCCM MIDIEdge — product existence as Mac 1×1 confirmed; primary manual/driver/host connector still ?.
• Orange Micro Grappler+ / other PCI serial cards — verify MIDI-safe RS-422 behavior/model by model.
• ESI / EgoSys USB MIDI products — no defensible Classic Mac OS driver branch recovered in this pass; do not add from later OS X/CoreMIDI support.
• RTP-MIDI — standardized after the Classic Mac era; exclude unless a period Classic implementation is found. Lone Wolf MIDITap/MediaLink is the confirmed earlier network-MIDI system in this post.
• Audio interfaces with MIDI DIN ports — separate expansion pass.