You should be able to pull down an ASPI layer set from Adaptec that will treat your ATAPI drive as an ASPI-compatible device. It used to be in the downloads section (can't quote from memory) and will upgrade the ASPI layer support to 4.6 (the current version). Alternatively, you could look at the support page for your CD-ROM, as some manufacturers post ASPI support packages for their drives.

I think in the end you may be better off aiming for a SCSI solution with a new drive; the AVA2904/6 is a good, low cost card from Adaptec, and Plextor does a low-cost range of SCSI CD drives for RIPping. I know you already have a setup in place, but this gives you a lot of flexibility and future proofing (you can add more SCSI devices to your box at leisure).

One of the few remaining Mk1 owners... #00015