Looking for NEC TK-80 ROM Image

[cjs]

Does anybody out there have a ROM image for the NEC TK-80 trainer board, or a board from which they can dump the ROM? I can't seem to find one on the 'net, and TK-80s have now become unaffordable for me n Japan ($400+).

It's small enough (768 bytes) that if worst comes to worst I'd even take a video of someone stepping through the ROM and displaying the contents.

The reason I want it is that I've been disassembling the ROM of my TK-85, and I'd like also to disassemble the TK-80 ROM and compare the two.

 

[cjs]

I've found it. It turns out that the MAME 0.261 ROM Set (Merged) on archive.org has a copy.

I've already got a first quick pass at a full disassembly, and the remaining work is likely to be fairly trivial. It is, unsurprsingly, very similar to the TK-85 monitor, with lots of stuff removed.

 

[cjs]

For those interested, I now have a complete disassembly here.