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Sorry to dig up an old thread, but I just wanted to post somewhere about some compatibility testing I did on EGRETs in a IIsi.
I came across two different chips in my IIsi systems: 341S0850 and 343S0100-01
The chip from a IIvx worked: 341S0851
The chip from an LC475 did not work: 341S0788
I'm really sorry about this, but I'm new to the whole PCB world. I realized that I was missing a couple of files. I just updated the github with all of the required files and zip file that should have all of the required files already added to it, so you should just be able to send the PCB...
I designed a little PCB to use a 50 pin SCSI internally in a Mac Plus so that you can have devices like the BlueSCSI installed internally all stealthily.
The files for the PCB are all available here: https://github.com/BigBadBiologist/Mac-Plus-Internal-SCSI
The installation process (not...