Search found 5 matches
- Wed Aug 28, 2019 9:45 pm
- Forum: Hardware
- Topic: Issue 3 Spectrum 48k no display no boot nothing
- Replies: 7
- Views: 6607
Re: Issue 3 Spectrum 48k no display no boot nothing
No worries Mark, I was sidetracked myself
- Tue Aug 27, 2019 11:57 am
- Forum: Hardware
- Topic: Issue 3 Spectrum 48k no display no boot nothing
- Replies: 7
- Views: 6607
Re: Issue 3 Spectrum 48k no display no boot nothing
Mark I evenually got it working it was a faulty ULA, I got a Nebula from retroleum, working great, i also made a TZXDuino to load the games
Many thanks for your help
Many thanks for your help
- Tue Jul 16, 2019 10:53 pm
- Forum: Hardware
- Topic: Issue 3 Spectrum 48k no display no boot nothing
- Replies: 7
- Views: 6607
Re: Issue 3 Spectrum 48k no display no boot nothing
Hi Mark, im back again... test signal on pin 32 of the ULA.. no signal, im just getting a high signal, the line goes to top then drops when i turn it off. I also tested using Saleae logic program but im getting an error on the 24MHz setting saying that it cant keep up with the data,(ive changed USB ...
- Tue Jul 16, 2019 2:41 pm
- Forum: Hardware
- Topic: Issue 3 Spectrum 48k no display no boot nothing
- Replies: 7
- Views: 6607
Re: Issue 3 Spectrum 48k no display no boot nothing
Thank you Mark for your help :-) I trust that your power adapter/PSU is set to the correct polarity? yes What are the actual voltages on the +5V +12V and -5V rails? +4.96V +11.98V -4.82V First, let’s look at the +5V and +12V supplies to the video section. Test pin 14 on the ULA (IC1) for the +5V sup...
- Mon Jul 15, 2019 10:12 pm
- Forum: Hardware
- Topic: Issue 3 Spectrum 48k no display no boot nothing
- Replies: 7
- Views: 6607
Issue 3 Spectrum 48k no display no boot nothing
Hi all, I picked up a untested Spectrum from ebay, hoping to relive some of my youth, I had a ZX81 back in the day and was always envious of my classmates when they got the speccy, I would appreciate if you guys could help me bring it back to life :-) Before I turned it on I followed JoulesperCoulom...