nama-chari
Chattie   Posts: 30 Registered: 3/12/2008 Status: Offline
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posted on 3/12/2008 at 08:37 |
I have been restoring a Sharp MZ80k.
When I got the machine, it was missing a character ROM and the Z80 processor. I replaced the z80 and burnt a new 2716 character EPROM, and it seemed to work ok, however I could not load anything from tape. I then decided to removed a bunch (20+) of ugly and badly soldered jumpers and hacks from the back of the motherboard in the hope of returning it to a stock standard config. Unfortunately, upon power-up the screen now displays only random characters!!!!
I was hoping that someone here may have one of these machines and would be willing to photograph and send me a hi-res picture of the back of their motherboard. I worry that some of the wires I removed were actually installed at manufacture, and I removed them not knowing. I did photograph the board before pulling all the wires off, so at the very lease I can probably wire everything back how it was, and hopefully it will work again, but I'd rather not do that as I would prefer not to have any of these hacks (whatever it is they do?). Please email me at random6000( at )mac.com.
Cheers, and thanks in advance.
Philip
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nama-chari
Chattie Posts: 30 Registered: 3/12/2008 Status: Offline
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posted on 20/12/2009 at 13:48 |
Fixed...except the cassette doesnt work 
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sharpmzorg
Moderator  Posts: 46 Registered: 28/3/2004 Status: Offline
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posted on 7/1/2010 at 19:00 |
Hi,
may be this will give a tiny help:
http://8bit-museum.de/docs/sharp3b.htm
But it shows not the back side...
Another but a very hard way is to compare the PCB with the schematic diagrams (see the Service Manual on my site).
Karl-Heinz
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nama-chari
Chattie Posts: 30 Registered: 3/12/2008 Status: Offline
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posted on 10/1/2010 at 13:04 |
quote:
Hi,
may be this will give a tiny help:
http://8bit-museum.de/docs/sharp3b.htm
But it shows not the back side...
Another but a very hard way is to compare the PCB with the schematic diagrams (see the Service Manual on my site).
Karl-Heinz
Thanks
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