Problems with mini din 8 serial ports and MIDI interfaces
I'm bringing up this old discussion to ask for help.
Hi guys, I need help, information, and spiritual comfort :-)
I'm trying to set up a MIDI to DMX setup with old Macintosh computers and MIDI interfaces.
I have an 8100 Maxpower G3 System 9.1 that works perfectly, and I have a PowerBook G3 Wallstreet 300 System 9.2 that also works. OK.
I have an MIDI Opcode Studio 4 interface and a MIDI Motu MTP AV interface, fine. I've tried a thousand ways but it doesn't work! The interfaces are not recognized.
8100 >Studio4 with OMS 2.3.8/2.3.5 nothing.
8100> MOTU with Freemidi 1.44 nothing.
Same thing with Powerbook G3.
With a cable, different from the one used to connect the interfaces, which has a mini din plug on one end and eight exposed wires on the other, I made a loopback by connecting the wire from pin 3 and the wire from pin 5, as described in many tutorials. Okay.
Computer serial port test with "loopback cable" and TechTool Pro 3 “passed.”
However, if I try to run the test with the normal cable connected to the computer and the interface, the test fails. The cable is not an original serial cable, but it is well known and has been tested with a multimeter by a technician who assured me of pin-to-pin continuity.
Where could the problem be? Non-original Apple mini din 8 serial cables? (But sold as compatible pinout pin to pin)
Problems with "stack AppleTalk" occuped serial port comunication?
MOTU/Studio 4 settings?
All the serial ports on the interfaces are dead?
Help me!
Thanks for your attention.
EDIT: I read this post
https://macos9lives.com/smforum/index.php?topic=7542.msg58406#msg58406 while searching the forum. Could it be that the cables need to be crossed ? I'm confused now!