recovering data from old hard drive

I have dug out an old SCSI hard drive from 1997 that may have some interesting stuff, most especially the source code for the SGI Iris flight sim demo.? I have a Linux system with an Adaptec 2940 (aic7880) that has two connectors on it.? It SEEMS from some probing that the 50-pin IDC connector on the top of the board is single-ended SCSI (it seems to have mostly grounds on one row of pins). Same for the drive, which is a Quantum ProDrive LPS.? The drive spins up and does some seeking right after power-on, so it sounds like it is working.? But, I can't seem to find that the drive is being recognized by the aic7xxx driver. So, looking at /proc/scsi/aic7xxx/## I see the device addresses all show just the negotiation settings, and /proc/scsi/scsi just shows my SATA devices but not the real SCSI ones. I have the right cable to plug my old HP scanner into the mounting plate Honda connector, and it shows up fine.? I could try getting a Honda to IDC-50 cable, but I thought the IDC50 connector on the board edge OUGHT to work. Does anybody have any suggestions on what to try? Thanks, Jon