Shinobi SEGA 16b no sound already swapped Z80b generic CPU and A7 Rom

Z80 has a whole family of chips that are easy to mistake for one another if you aren't familiar with them. SIO (Serial I/O), DMA (Direct Memory Access), DART (Dual Aschronous Receiver / Transmitter), and PIO (Parallel I/O) come to mind.

They also come with different markings. Z80A may also be marked Z80 Z0840004PSC, Z80B marked as Z80 80940006PSC, and there are Z80E and Z80H as well... plus the vanilla Z80 CPU that runs at 2.5MHz. Can get a bit confusing.

To add to it, Sharp has the D780C which is a CMOS Z80 and the D780C-1 which is Z80A and D780C-2 which is Z80B.

None of these are to be confused with Z8 which is a microcontroller of a different family or the Z8002 which is a 16-bit CPU found on Pole Position boards.

Thanks. This was extremely helpful.
 
I edited my post from above to remove the mention of not needing the decrypted to not mislead anybody. When I was doing the work I using new AMD 27C256 chips for troubleshooting instead of reprograming the original Fujitsu 27c256. I must have mixed them up after a night of getting frustrated. I figured out I had them swapped when I went to reprogram the original fujitsu chip to keep my board as original as possible. I "DID" need the encrypted rom.
 
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