Identify CPU architecture for old EPROM that I dumped

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clueless
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Identify CPU architecture for old EPROM that I dumped

Post by clueless » Tue Aug 27, 2019 12:17 pm

Hello.

I found a 32k EPROM in in a box of junk. I have no idea where the EPROM came from. I built a circuit using an Arduino Nano and 4x 4-bit binary counters (to set the address bits) and dumped the EPROM. I'm certain that it does not contain 6502 instructions, as the top-most addresses do not contain anything like normal 6502 IRQ/NMI/RESET vectors. It might be z-80, but I've not looked at Z-80 in decades and forgot it. Anyway, I thought that some here might find it fun to try to figure out what this EPROM is for.

https://www.ecoligames.com/~djenkins/Pr ... m-dump.bin
https://www.ecoligames.com/~djenkins/Pr ... m-dump.txt

lidnariq
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Re: Identify CPU architecture for old EPROM that I dumped

Post by lidnariq » Tue Aug 27, 2019 1:02 pm

In a histogram, that resembles Z80 code.

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TmEE
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Re: Identify CPU architecture for old EPROM that I dumped

Post by TmEE » Wed Aug 28, 2019 1:37 am

it looks like Z80 code indeed, and there's a little stub at $0066 where Z80 has its NMI location.

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