Hi went to play this today and have this on start screen , doesn’t get to point where I can get keys to work , any ideas ?
Thanks
Fault ZX Spectrum 48k
- 1024MAK
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- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: Fault ZX Spectrum 48k
Hello and welcome
I’ve moved this topic into the ZX Spectrum Hardware area.
The good news is that it looks like the Z80, the ROM, the ULA and most of the RAM is working. But after doing it’s memory check and trying to set the system up, the Z80 is crashing. It could be a fault with the upper RAM.
Do you have any test gear, such as a digital multimeter? Logic probe, or oscilloscope?
And are you able to solder?
Mark
I’ve moved this topic into the ZX Spectrum Hardware area.
The good news is that it looks like the Z80, the ROM, the ULA and most of the RAM is working. But after doing it’s memory check and trying to set the system up, the Z80 is crashing. It could be a fault with the upper RAM.
Do you have any test gear, such as a digital multimeter? Logic probe, or oscilloscope?
And are you able to solder?
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer being good this year.
ZX81 Chip Pin-outs
ZX81 Video Transistor Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer being good this year.
-
- Posts: 5
- Joined: Fri Apr 02, 2021 2:34 pm
Re: Fault ZX Spectrum 48k
I can solder but have no test equipment unfortunately
Mark
Mark
Re: Fault ZX Spectrum 48k
I also think it is a faulty upper-RAM.
- 1024MAK
- Posts: 5189
- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: Fault ZX Spectrum 48k
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer being good this year.
ZX81 Chip Pin-outs
ZX81 Video Transistor Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer being good this year.
-
- Posts: 5
- Joined: Fri Apr 02, 2021 2:34 pm
Re: Fault ZX Spectrum 48k
Ok will have a look thanks