3 ms·

I still have my zx-81, it powers up but the keyboard membrane is long gone. Learnt z80 assembly on it. Good times.

stephbu 1y ago
Yeah me too in 1982, using the Melbourne House Z80 reference, aged a young 10 years old. Working with POKE and no macro-assembler, I wrote mnemonics then translated them to machine-code by hand. A baptism of fire that to this day that I've not forgotten. This book was the ignition that changed my life... https://archive.org/details/z-80-reference-guide-alan-tullyacme https://archive.org/details/z-80-reference-guide-alan-tullya...
- rwmj 1y ago
  Cover art to die for too!
YZF 1y ago
I have my ZX-81 (with the 16KB expansion pack) and my ZX-Spectrum (with a microdrive). I think they're in working condition though they haven't been powered up like in 30+ years.
- JdeBP 1y ago
  Watching the retrocomputing enthusiasts, apart from obvious things like water damage, it seems that the first thing that one always has to check before attempting to power up is capacitors. A generalism true for all old electronics, rather than Sinclair-specific.
  - actionfromafar 1y ago
    And always assume the C64 power supply will fry the computer. It fails over time by raising the output voltage.
- rwmj 1y ago
  Don't just plug it in! The power supply and/or VRM can fail in ways that deliver bad voltages to components. You might want to watch some of Lee's[1] videos first on how to bring up a ZX81 safely, or ask in his discord community for more help. [1] https://www.youtube.com/@MoreFunMakingIt/videos https://www.youtube.com/@MoreFunMakingIt/videos
  - pjmlp 1y ago
    That is why my Timex 2068 has never left the box since around 1990. Better admire for what it was and use an emulator instead.
  - YZF 1y ago
    Thanks for the tip! If/when I do I'll try to use a bench power supply so I can put a current limit on it.
boomlinde 1y ago
ZX Renew sells replacement membranes for £12 if you want to get it in working order.

Yeah me too in 1982, using the Melbourne House Z80 reference, aged a young 10 years old. Working with POKE and no macro-assembler, I wrote mnemonics then translated them to machine-code by hand. A baptism of fire that to this day that I've not forgotten. This book was the ignition that changed my life... https://archive.org/details/z-80-reference-guide-alan-tullyacme https://archive.org/details/z-80-reference-guide-alan-tullya...

rwmj 1y ago
Cover art to die for too!

YZF 1y ago

I have my ZX-81 (with the 16KB expansion pack) and my ZX-Spectrum (with a microdrive). I think they're in working condition though they haven't been powered up like in 30+ years.

JdeBP 1y ago
Watching the retrocomputing enthusiasts, apart from obvious things like water damage, it seems that the first thing that one always has to check before attempting to power up is capacitors. A generalism true for all old electronics, rather than Sinclair-specific.
- actionfromafar 1y ago
  And always assume the C64 power supply will fry the computer. It fails over time by raising the output voltage.
rwmj 1y ago
Don't just plug it in! The power supply and/or VRM can fail in ways that deliver bad voltages to components. You might want to watch some of Lee's[1] videos first on how to bring up a ZX81 safely, or ask in his discord community for more help. [1] https://www.youtube.com/@MoreFunMakingIt/videos https://www.youtube.com/@MoreFunMakingIt/videos
- pjmlp 1y ago
  That is why my Timex 2068 has never left the box since around 1990. Better admire for what it was and use an emulator instead.
- YZF 1y ago
  Thanks for the tip! If/when I do I'll try to use a bench power supply so I can put a current limit on it.

boomlinde 1y ago

ZX Renew sells replacement membranes for £12 if you want to get it in working order.