Search found 334 matches

by hlide
Fri Apr 03, 2020 2:44 pm
Forum: Hardware
Topic: MZ700 video problem
Replies: 13
Views: 156

Re: MZ700 video problem

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...
by hlide
Wed Apr 01, 2020 3:45 pm
Forum: Hardware
Topic: MZ700 video problem
Replies: 13
Views: 156

Re: MZ700 video problem

There is a volume potentiometer behind, just set in the middle. Yes there is one beep when you power it.
by hlide
Mon Mar 30, 2020 9:46 am
Forum: Hardware
Topic: MZ700 video problem
Replies: 13
Views: 156

Re: MZ700 video problem

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...
by hlide
Fri Mar 13, 2020 1:25 pm
Forum: Buy/sell
Topic: Sharp MZ80b - MZ-80GMK Extension Graphics cards
Replies: 3
Views: 357

Re: Sharp MZ80b - MZ-80GMK Extension Graphics cards

I'm posting your offer at some FB groups dedicated to SHARP MZs.
by hlide
Wed Feb 19, 2020 9:19 am
Forum: Other
Topic: SUC library
Replies: 5
Views: 909

Re: SUC library

by hlide
Sun Feb 09, 2020 11:01 am
Forum: Hardware
Topic: MZ 700 - rear view
Replies: 14
Views: 2083

Re: MZ 700 - rear view

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.
by hlide
Thu Jan 30, 2020 10:56 am
Forum: Assembly
Topic: Type of machine ?
Replies: 10
Views: 1135

Re: Type of machine ?

Ah yes, I'm less familiar with the 800 mode in MZ-800. Understood.
by hlide
Wed Jan 29, 2020 5:55 pm
Forum: Assembly
Topic: Type of machine ?
Replies: 10
Views: 1135

Re: Type of machine ?

$1000-$CFFF is pure DRAM - except for $C000-$CFFF when swap for MONITOR ROM is enabled by MZ-80A/MZ-1200 so I'm not sure why you need $C800.
by hlide
Wed Jan 29, 2020 12:05 pm
Forum: Assembly
Topic: Type of machine ?
Replies: 10
Views: 1135

Re: Type of machine ?

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...
by hlide
Wed Jan 29, 2020 9:32 am
Forum: Assembly
Topic: Type of machine ?
Replies: 10
Views: 1135

Re: Type of machine ?

What are the machines you want to detect? the monitor name checking will be defeated with a custom rom.