This is the ACard product which was literally "borrowed" by ACard.
ProMax took a SIM to the market, using ACard chipset. Acard got in mood - and "borrowed" the idea, adopting the UDMA/66 card for the Mac.
Originally they had no clue about the Mac.
Their next step was "SCSIDE" - which was based on the idea of TurboMax/33: while Apple did not had "ATA (IDE) Manager" in every Mac, they had the SCSI Manager everywhere. So an ATA card could be successful by implementing the ATA - SCSI translation.
ACard put that translation idea in their UDMA/66 product and later on the chip level as "SCSIDE".
So the road for Promise was paved... But their first good ATA product was the UDMA/100, the UltraTek/66 was horribly slow in Yosemite and Sawtooth. The problem was with the chip. On the other side the UDMA/66 chip of ACard was very good and Sonnet liked it.
I have to admit, ACard did a very good job "borrowing" the TurboMax/33 software. But I wasn't very happy back than.