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No, when you remove the ROM it doesn't end with that kind of multicolored checkboard : I never saw that on a working MZ-700. It is not an issue with ROM. If you remove CPU, I also believe you won't get that. So if you have that issue with no ROM or CPU, there is definitely another issue elsewhere. I...
I have a similar issue with my fourth MZ-700 (bought as such). I tried to swap every IC (CPU, ROM, CGROM) to a working MZ-700 and they work. In the meantime, the PSU on the problematic MZ-700 broke. So I suspended my trials. Pacman, I'm surprised it was an issue with CGROM because you can see charac...
- Fri Mar 13, 2020 1:25 pm
- Forum: Buy/sell
- Topic: Sharp MZ80b - MZ-80GMK Extension Graphics cards
- Replies: 3
- Views: 357
I'm posting your offer at some FB groups dedicated to SHARP MZs.
2H (7417) pin 2 = RD3 (printer bus). It should have been connected to the right pin of the rear connector. I also notice GND pins are all connected on the rear connector. No doubt it was for a printer. So I suspect one of the previous owners removes the rest of wires.
One way to detect an MZ-80 K definitely is to check whether a byte write to $D000-$D3FF is mirrorred into $D400-$D3FF. One way to detect an MZ-80 A/MZ-1200 definitely is to check whether you can swap $C000-$CFFF into MONITOR ROM (that is, if you cannot modify a byte) One way to detect an MZ-700 or o...