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PostPosted: Tue Aug 27, 2019 12:17 pm 
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Joined: Sun Sep 07, 2008 7:27 am
Posts: 498
Location: Seatlle, WA, USA
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


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PostPosted: Tue Aug 27, 2019 1:02 pm 
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Joined: Sun Apr 13, 2008 11:12 am
Posts: 8571
Location: Seattle
In a histogram, that resembles Z80 code.


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PostPosted: Wed Aug 28, 2019 1:37 am 
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Joined: Wed Feb 13, 2008 9:10 am
Posts: 703
Location: Estonia, Rapla city (50 and 60Hz compatible :P)
it looks like Z80 code indeed, and there's a little stub at $0066 where Z80 has its NMI location.

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