Testing out my new External multi ROM and Expansion Bus extender
8 ROM banks of size 8192 bytes, selected with DIP - BUT requires the original ROM in ZX81 because of display generation, tested with the followin ZX81 ROMs:
* 550, 622, 649, SG and X2
Also tested, but not working correctly because of display, but they do respond to key press:
* Skyware Forth (and variants), ASZMIC
The Bus extender supports edge connector, so interfaces can be made a bit like "PC cards" which saves soldering and edge connectors.
ZX81 External ROM
ZX81 External ROM
https://api.zxinfo.dk/v3/ - ZXDB API for developers
zxinfo-file-browser - Cross platform app to manage your files
https://zxinfo.dk - another ZXDB frontend
zxinfo-file-browser - Cross platform app to manage your files
https://zxinfo.dk - another ZXDB frontend
Re: ZX81 External ROM
That looks cool. I'd could be interested in one of those.
Re: ZX81 External ROM
KiCad and Gerber files will be released on GitHub as soon as I have done the final testing.
https://api.zxinfo.dk/v3/ - ZXDB API for developers
zxinfo-file-browser - Cross platform app to manage your files
https://zxinfo.dk - another ZXDB frontend
zxinfo-file-browser - Cross platform app to manage your files
https://zxinfo.dk - another ZXDB frontend