Stuart is restoring a 1616 machine and documenting his progress at:
He has read the PAL chips using a ChipTester V2 Pro from BackBit.io and I eagerly await looking at them. I don't know whether the security bits were blown or not. If they were, one can only make a best guess by examining the behaviour.
There is a project that tries to dump PAL contents. Easily done for combinatorial chips, less so for registered chips.
I don't know how clever it is, or how reliable the output.
Worst case, I could make a best guess replacement and ask Cefiar to try them out.
His system has:
- 1616 processor motherboard
- SCSI and Memory Expansion board
- Two intelligent Z80-based Floppy Disc Controller boards
Both SCSI and floppy discs are obsolete, and I am not very motivated to reverse engineer the PALs although they should be fairly simple to do.
The motherboard PALs are registered and harder to reverse engineer. I can't scope his system (and nor can he) but I think I could make a good guess at the 68000 DRAM interface by scoping my Atari ST here.