4 ms·

Recently found Z80 video of how a guy makes ZX Spectrum computer from ground up, fixes bugs and problems as he proceeds. Video is in Russian, but still amazing

by ddon 10y ago

Recently found Z80 video of how a guy makes ZX Spectrum computer from ground up, fixes bugs and problems as he proceeds. Video is in Russian, but still amazing even if you don't understand it! https://www.youtube.com/watch?v=8rWCYo1UcOQ https://www.youtube.com/watch?v=8rWCYo1UcOQ

XtalJ 10y ago
Nice, I'm thinking about making it possible to connect it directly to a display/TV and keyboard. Now, I have to have a terminal or laptop + terminal emulator.
- jdmoreira 10y ago
  It seems hard to drive a vga display without resorting to fpgas or an avr. If composite is enough, the NES PPU could be a fun addition to that design :)
  - Rhinobird 10y ago
    Apparently, it can be done with a bunch of TTL logic chips. http://forum.6502.org/viewtopic.php?f=4&t=3329 http://forum.6502.org/viewtopic.php?f=4&t=3329
  - XtalJ 10y ago
    Yes, the composite solutions sounds more fun :-)
- ddingus 10y ago
  A Propeller Chip does this easily.
- ddingus 10y ago
  A Propeller Chip does this easily.
- ddingus 10y ago
  A Propeller Chip does this easily.
jdmoreira 10y ago
A lot of the ZX Spectrum functionality and logic is in the ULA, an ASIC. There's a whole book on the ULA - http://www.zxdesign.info/book/theZXSpectrumULA.shtml http://www.zxdesign.info/book/theZXSpectrumULA.shtml
- dfox 10y ago
  Actually there is now design out of 74ls series logic that replicates functionality of the ULA (it is probably completely bug-for-bug compatible), IIRC it was designed by author of said book.