Specifically, a SCSI cdrom audio cable worked although I can't recall if ATA and SCSI cdrom drives has identical connectors or not. Perhaps the SCSI one tended

Specifically, a SCSI cdrom audio cable worked although I can't recall if ATA and SCSI cdrom drives has identical connectors or not. Perhaps the SCSI one tended to be white rectangle without a retention mechanism while the ATA one was one was black thinner, and longer, with a retention mechanism. 3 of the 4 wires (RX, TX, and GND) would then be soldered to a DB-9 female plug. https://www.hpcalc.org/contents/4741/48techni.pdf https://www.hpcalc.org/contents/4741/48techni.pdf