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Thanks to PCBWay for sponsoring this video!
Check out their KiCad Open Source Design Contest!
www.pcbway.com/activity/kicad...
In this video I finally get a chance to play around with the ZX81 I picked up back in September 2023 at VCFMidwest. In my younger days I may have chuckled at this thing but as I've gotten older I understand and appreciate the role this little computer had in computing history. I think for many folks this was their first computing experience just as mine was with a hand me down VIC-20.
I didn't even know if this thing worked when I bought it. Watch and see how things go!
Huge thanks to Lee from More Fun Making It! Check out his channels!
@MoreFunMakingIt
@morefunmakingit2
Resources
Wave conversion software:
www.zx81stuff.org.uk/zx81/tap...
Tetris (click show all files to see the .p file)
archive.org/details/ZX-81_Tet...
3D Monster Maze
www.zx81stuff.org.uk/zx81/tap...)
MP3 Player I used
en.wikipedia.org/wiki/Sansa_Fuze
3.5mm stereo to RCA male breakout cable similar to mine.
www.amazon.com/Monoprice-1006...
Ram related stuff
ZX81-Internal-16K-Expansion 'No Wobbly Edition' (project page)
github.com/redhawk668/ZX81-In...
The one I got from ebay is no longer listed but here is a Tindie seller link.
www.tindie.com/products/redha...
First 32K SOPs
www.ebay.com/itm/372247259274
Second 32K SOPs
www.ebay.com/itm/121113915913
32K DIP-28 that worked
www.ebay.com/itm/263959049103
Blog post with the DIP chip mod that ended up working for me.
blog.tynemouthsoftware.co.uk/2...
Keyboard Membrane I bought
www.ebay.com/itm/304989279583
Composite Mod I bought
www.ebay.com/itm/124844441452
As I always say, if you've not already, go check out my awesome neighbor-in-retro, @retroCombs! He's got good stuff!
If you have actually read this far down and would like a HackShack sticker, figure out a way to get in touch with me and I'll see what I can do to get one to you! :-D
Music: @WhiteBatAudio Thanks for the tunes!
00:00 Intro
00:52 Surprise Special Guest!
04:42 PCBWay Spot
05:07 Initial ZX81 Testing
06:55 Replacements/Upgrades Planned
07:46 Power Supply
08:26 Open Sesame
08:50 Composite Mod
09:44 Internal 16K Upgrade
14:47 Loading Games
16:43 Keyboard Membrane Replacement
20:00 Reassembly & Final Test
21:48 Wrap-up