8 ms·
It is nice to see this kind of thing still going on. I've been doing something similar with a Z80 recently; currently I have a Z80 hooked up to an arduino-mega
by stevekemp 7y ago
It is nice to see this kind of thing still going on. I've been doing something similar with a Z80 recently; currently I have a Z80 hooked up to an arduino-mega, which is faking port-based I/O and RAM read/writes.
When I started my goal was to write some simple code, hosted on the arduino, then put together a "real" system with EPROM for ROM and proper RAM chips.
Instead I got distracted porting BASIC, FORTH, and similar things to the working processor. I should get back to it!
I think the Z80 is simpler to get started with than the 6502, when it comes to physical circuits, as it needs fewer components. (Having RAM refresh built-in, for example.)
- LIV2 7y agoWhen I started with the 6502 it took a while to get a working, stable system due to a couple of weird circuit issues (like forgetting to qualify R/W by PHI2) which wouldn't have been the case if I was using a Z80 Do you know if there is a forum for Z80 homebrew systems?
- stevekemp 7y agohttp://www.z80.info/ http://www.z80.info/ has a lot of information, but it's not a forum as such. I've found a couple of groups on reddit, for retro building and z80 systems, but nothing really large. FWIW this is the high-level overview I've put together: https://steve.fi/Hardware/Z80/ https://steve.fi/Hardware/Z80/
- linker3000 7y agohttps://www.retrobrewcomputers.org/forum/index.php https://www.retrobrewcomputers.org/forum/index.php https://groups.google.com/forum/#!categories/retro-comp https://groups.google.com/forum/#!categories/retro-comp https://groups.google.com/forum/#!forum/rc2014-z80 https://groups.google.com/forum/#!forum/rc2014-z80
- djmips 7y agoThe Eater 6502 design is using Static RAM so the RAM refresh is a non issue. Look at the schematic. Its just CPU, ROM, RAM, VIA, LCD. Doesn't get much simpler than that.