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harshbarj
Joined: 01 Oct 2004
Posts: 169
Location: behind you!
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 Posted:
Sun Dec 10, 2006 12:03 am |
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I'm working on a z80 based computer and really need to find a site that has info on homebrew systems. I have already looked z80.info over and found a few things but need more. As I'm an amature at electronics (never before have I even tried digital circuits before). |
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Diky
Joined: 02 Oct 2004
Posts: 22
Location: near myself
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Sun Dec 10, 2006 8:49 pm |
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Hi Harshbarj, in 1994 i made an Homebrewed Z80 computer, a simple minimal system z80+clock+ram+rom+6*7segment display and a rough binary transfer routine for connect to a parallel port. At the time i didn't have an eprom programmer and it was a big problem store assembly program. I don't know what you exactly want to do but keep in mind that working without a printed circuit board is a pain (or a great soldering exercise  ). For my project i used OUT and IN commands for isolated IO using some tri state buffer and it was simple. Better solution is use Z80 PIO but wires increase. It was something like this
http://www.geocities.com/SiliconValley/Peaks/3938/gfx/mario_schema.gif
for the 7 display segment module i used something like
port 0 (3 lines) =>decoder =>cathode of display
port 1 (8 lines) =>segment of display
throught software (z80) i select cathode of display (port 0) and i send throught 8 lines V+ to segments (port 1).
Probably right solution should be to put a transistor for each cathode display but in fact TTL drives well 7 segment display.
good luck . |
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harshbarj
Joined: 01 Oct 2004
Posts: 169
Location: behind you!
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Mon Dec 11, 2006 8:06 pm |
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Found a sweet homebrew z80 with a video card that nearly equals the c64 in power! Now to find a way to get it all on one card.
http://www.retroleum.co.uk/z80-v2project.html
BTW. I'm not a asm programmer at all (only just larning c++). Any hints on where to get good info? |
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Raise Your IQ. Eat Gifted Children. |
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harshbarj
Joined: 01 Oct 2004
Posts: 169
Location: behind you!
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Tue Dec 12, 2006 8:07 pm |
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After checking into the site I linked to I discovered he made a third version of that system. All I can say is wow. Just watch the short demo. Could be used for some sweet games.
http://www.retroleum.co.uk/z80-v3project.html |
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Raise Your IQ. Eat Gifted Children. |
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