I looked and found that there is an adapter for the Macs for the SCSI from something called HD-30 to SCSI2. SCSI2 is what the 50 pin connector is now called. I'm guessing it will be single ended, so should be able to use a Sparc 411 box, and a Plextor CD drive to install it.
This is equivalent to a Sparcstation 5, and is probably the fastest system likely to be had as a laptop by my collecting parameters (cheap, bargain).
|Battery in nice shape|
|HD-30 Scsi Port can be seen at the left|
|Not sure if this is original to any Sparcbook.|