I agree with Techknight. However, it shouldn't matter what SCSI chip you use as long as you adapt its pinouts to what is assigned to the original. The only possible limitation would be the fact that you're dealing with 8-bit data transfers between the chip and logic board, plus the speed may be regulated by the internal clock crystal. You could weird-wire a socket of choice and stick a new chip in there, but I doubt you'd notice that much of a speed boost.

What would be nice is if some of you out there could do the following: Open up your retro-mac, locate the SCSI controller chip and list the chip info on top. We all know that the NCR/Zilog 53C80 is common amongst most 68k Macs, but I'm not sure what type of chip was used on most SCSI only based PPC Macs (pre-G3). I'll check my PM7500 and see what it is. Although, I don't care much for mine, since I just use a PCI Adaptec AHA-2940-U2B card and an 80 GB U160 LVD/SE HDD.

73s de Phreakout. :rambo: