It has Marvell chipset as it was mentioned before it correctly.
Sonnet never wrote a SIM (SCSI Interface Module) for MacOS 7 - 8 - 9.
"SIM" is the nickname of the run-time hardware-bound device driver for the "classic" MacOS.
The architecture can be simplified to something like Open Firmware ---> SIM ---> SCSI Mass Storage Driver (the later resided in a separate partition and is installed by Disk Utility and it's look-alikes like LaCie, etc.). Open Firmmare and the SIM are usually in ROM, SCSI Mass Storage Driver on the disk in either a partition (bootable) or as an extension.
It is possible to have even SIM as an extension, this is how it is developed. We put SIM in the ROM usually in final phase of the development, before that on the development machine it is just an extension.
In last two and a half decades SIM was written by:
- Initio
- ATTO
- Advansys (probably same as Initio)
- ACard
- Myself
Before that John B. with Ada J. wrote one for FWB. That's the "long" list.
Sonnet simply had no opportunity and later there was no market for MacOS 9.x anymore which would justify the efforts.
Otherwise their engineer was more, than capable to make out a better copy than anyone above, myself included.
If we reduce the search for ATA or SATA cards only the list will be reduced to ACard and myself.
