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ZX Spectrum Dead Data
Special thanks to PCBWay for sponsoring this video.
https://www.pcbway.com/
Today I have a rubber key 48K ZX Spectrum issue 3B on the bench. This particular motherboard is an unusual dark green color, manufactured in Korea, and it arrived with a completely dead data bus.
Using a diagnostic card and an oscilloscope, I trace the power, clock, and reset signals to figure out why the system refuses to boot. After ruling out the ULA, the focus shifts to the Z80 CPU. I remove the original processor, test a replacement, and install it to see if that resolves the erratic data lines.
Once the repair is done and the display is stabilized with a composite mod, I test the system with a quick run of Manic Miner.
āāāāāāāāāāāāāāāāāāāāāāāāāāāāā
If you'd like to help keep the lights on (and the tools plugged in),
my Patreon is the best way to do it. Patrons get ad-free early access
to videos, behind-the-scenes updates, and entry to a super secret
Discord channel ā plus my sincere gratitude, which is worth roughly
what you'd expect.
āø Patreon: https://www.patreon.com/c/morefunmakingit
āāāāāāāāāāāāāāāāāāāāāāāāāāāāā
I also have another channel called More Fun Making It, where I build
things from scratch instead of trying to coax life back into them.
Same shed, different end of the workbench.
āø More Fun Making It: https://www.youtube.com/@MoreFunMakingIt
āāāāāāāāāāāāāāāāāāāāāāāāāāāāā
There's also the Retro Hardware Discord, where people who enjoy this
sort of thing gather to talk about it. It's better than it has any
right to be.
āø Retro Hardware Discord: https://discord.gg/ChH726tbbF
āāāāāāāāāāāāāāāāāāāāāāāāāāāāā
#ZXSpectrum #RetroComputing #Z80
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By Special thanks to PCBWay for sponsoring this video.
https://www.pcbway.com/
Today I have a rubber key 48K ZX Spectrum issue 3B on the bench. This particular motherboard is an unusual dark green color, manufactured in Korea, and it arrived with a completely dead data bus.
Using a diagnostic card and an oscilloscope, I trace the power, clock, and reset signals to figure out why the system refuses to boot. After ruling out the ULA, the focus shifts to the Z80 CPU. I remove the original processor, test a replacement, and install it to see if that resolves the erratic data lines.
Once the repair is done and the display is stabilized with a composite mod, I test the system with a quick run of Manic Miner.
āāāāāāāāāāāāāāāāāāāāāāāāāāāāā
If you'd like to help keep the lights on (and the tools plugged in),
my Patreon is the best way to do it. Patrons get ad-free early access
to videos, behind-the-scenes updates, and entry to a super secret
Discord channel ā plus my sincere gratitude, which is worth roughly
what you'd expect.
āø Patreon: https://www.patreon.com/c/morefunmakingit
āāāāāāāāāāāāāāāāāāāāāāāāāāāāā
I also have another channel called More Fun Making It, where I build
things from scratch instead of trying to coax life back into them.
Same shed, different end of the workbench.
āø More Fun Making It: https://www.youtube.com/@MoreFunMakingIt
āāāāāāāāāāāāāāāāāāāāāāāāāāāāā
There's also the Retro Hardware Discord, where people who enjoy this
sort of thing gather to talk about it. It's better than it has any
right to be.
āø Retro Hardware Discord: https://discord.gg/ChH726tbbF
āāāāāāāāāāāāāāāāāāāāāāāāāāāāā
#ZXSpectrum #RetroComputing #Z80