MaximRecoil
Well-known member
Has anyone ever identified the chips on a Super Punch-Out security board?
For quite a few years the security has been defeated. Both Jrok and 2600 have made PCBs which replicate the function of the original security board, but they use a different design. In the notes for MAME 0.129u4, it says:
Since it's known how to defeat the security, both in MAME and on real hardware, is it known what those sanded chips are? If not, is there any way to find out such as with an oscilloscope or logic probe?
The RP5C01 mentioned in the MAME notes is an 18-pin DIP, and there is only one such chip on the SPO security board (location U6).
I'm pretty sure the CPU is just a normal 4 mHz Z80A, the same as the main CPU on a Punch-Out board. If so, and if U6 is an RP5C01, that leaves 5 chips to identify: two 14-pin DIPs, two 16-pin DIPs, and one 8-pin DIP.
I would like to know what the chips are because a lot of similar looking chips (TTL logic chips) have failed over the years on my SPO board, and if any of the chips on the security board ever fail I'll be up a creek without a paddle, because those security boards are so hard to come by.
For quite a few years the security has been defeated. Both Jrok and 2600 have made PCBs which replicate the function of the original security board, but they use a different design. In the notes for MAME 0.129u4, it says:
Nicola Salmoria and Bob Seidel added basic support of RP5C01 to remove (most) protection kludges in Super Punchout.
Since it's known how to defeat the security, both in MAME and on real hardware, is it known what those sanded chips are? If not, is there any way to find out such as with an oscilloscope or logic probe?
The RP5C01 mentioned in the MAME notes is an 18-pin DIP, and there is only one such chip on the SPO security board (location U6).
I'm pretty sure the CPU is just a normal 4 mHz Z80A, the same as the main CPU on a Punch-Out board. If so, and if U6 is an RP5C01, that leaves 5 chips to identify: two 14-pin DIPs, two 16-pin DIPs, and one 8-pin DIP.
I would like to know what the chips are because a lot of similar looking chips (TTL logic chips) have failed over the years on my SPO board, and if any of the chips on the security board ever fail I'll be up a creek without a paddle, because those security boards are so hard to come by.
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