4 ms·
Hi folks, I see you found my 'parts bin' Z80 board! Coincidentally, I'm reworking part of it on the desk in front of me right now. I'm removing the address dec
by linker3000 8y ago
Hi folks, I see you found my 'parts bin' Z80 board!
Coincidentally, I'm reworking part of it on the desk in front of me right now. I'm removing the address decoder (top left) for the I/O (LED) port and am replacing it with a control line from the GAL (which is now a 22V10 instead of a 20V8).
Apart from giving me something to build, the intention is to use the board as a STEM show-and-tell item during school visits and local 'Jams' - I am a volunteer STEM ambassador in the UK and my company kindly gifts employees several 'volunteering' days a year for local activities, so I help out with career & STEM days as well as weekend special events (eg: https://twitter.com/linker3000/status/1020709404843421696 https://twitter.com/linker3000/status/1020709404843421696).
Since I had the GALs to hand, using one is fine for me - but for those who haven't got a programmer it would be a bit of an expense to tool up for it, so I don't expect many to copy the design.
Someone asked in another thread about the single-sided wirewrapping technique; it IS really quick to do, is easy to trace where you're going to/from, rework is quick, PLUS as a STEM show-and-tell, everything is on one side so it can be left on a desk and doesn't need to be constantly picked up/put down to see everything; this reduces the risk of damaging the wiring and board.
Edit: The DIY retro build computer guys are really friendly and helpful, so do drop by and see what's going on:
https://groups.google.com/forum/#!forum/rc2014-z80 https://groups.google.com/forum/#!forum/rc2014-z80
https://www.retrobrewcomputers.org/forum/index.php https://www.retrobrewcomputers.org/forum/index.php
https://www.retrobrewcomputers.org/doku.php https://www.retrobrewcomputers.org/doku.php
http://6502.org/homebuilt http://6502.org/homebuilt
There's other places out there too, those are just the ones I've actively used.
Thanks for the attention.