Search found 12 matches
- Wed Aug 19, 2020 1:39 pm
- Forum: Hardware
- Topic: Have I fried the ULA?
- Replies: 10
- Views: 5412
Re: Have I fried the ULA?
That's very true :) OK, I desoldered (very carefully) the internal RAM mod and spent the morning going over the ZX81. I'm satisfied it's clean (no tiny splashes of solder etc.) and the traces are good (checked continuity on every one). I've resoldered any dry dull bits (there were a couple around th...
- Mon Aug 17, 2020 10:51 pm
- Forum: Hardware
- Topic: Have I fried the ULA?
- Replies: 10
- Views: 5412
Re: Have I fried the ULA?
Smart. Right, I’ll find a more powerful pair of glasses and go over those traces. I’m sure to have done something dreadful
- Mon Aug 17, 2020 9:47 pm
- Forum: Hardware
- Topic: Have I fried the ULA?
- Replies: 10
- Views: 5412
- Mon Aug 17, 2020 9:46 pm
- Forum: Hardware
- Topic: Have I fried the ULA?
- Replies: 10
- Views: 5412
Re: Have I fried the ULA?
Right, I tried the SAVE”S” and, sadly, there was nothing (also did it on my working 81 to gauge what I should be hearing).
Can I infer anything from this?
Can I infer anything from this?
- Mon Aug 17, 2020 8:46 pm
- Forum: Hardware
- Topic: Have I fried the ULA?
- Replies: 10
- Views: 5412
Re: Have I fried the ULA?
I’ll try SAVEing. Thanks. As for putting the old RAM back, I’m afraid I had to snip some legs. Couldn’t desolder them cleanly (and I do get the fear desoldering on Sinclair boards - I had a bad experience with a Spectrum!).
I guess I could carefully desolder this RAM board and fit some sockets.
I guess I could carefully desolder this RAM board and fit some sockets.
- Sat Aug 15, 2020 10:54 am
- Forum: Hardware
- Topic: Have I fried the ULA?
- Replies: 10
- Views: 5412
Have I fried the ULA?
Hallo all. I thought it would be fun to work on my spare ZX81 - which already has a new power regulator and composite mod - but this time, to install an internal 16K unit that I had lying around. Here's my board with the 16K attached. IMG_1386.jpeg I thought I did an okay job on it but, on firing th...
- Tue Jan 08, 2019 10:40 pm
- Forum: GAMES
- Topic: Murgatroyd's Revenge (1982) found and uploaded
- Replies: 2
- Views: 3063
Murgatroyd's Revenge (1982) found and uploaded
Hallo lovely fellow ZX81 users. I'm an infrequent visitor - I think the last time I posted was 8 years ago when several of you good people helped get my 81 back to life. So, by means of recompense, I bear gifts in the shade of a long lost game (I think) Murgatroyd's Revenge. Bit of backstory if I ma...
- Tue Jan 05, 2010 6:15 pm
- Forum: Hardware
- Topic: DeadX81 - power supply?
- Replies: 10
- Views: 17303
Re: DeadX81 - power supply?
Blimey. That was quick. New ULA arrived in the post today and look..
I can't believe it! Thanks SO much for your help guys. Now to start amassing hardware and tapes for it (why did I ever give away my copy of Murgatroyds Revenge?).
I can't believe it! Thanks SO much for your help guys. Now to start amassing hardware and tapes for it (why did I ever give away my copy of Murgatroyds Revenge?).
- Mon Jan 04, 2010 12:57 pm
- Forum: Hardware
- Topic: DeadX81 - power supply?
- Replies: 10
- Views: 17303
Re: DeadX81 - power supply?
Thanks. That's excellent. Well, the first good news so far. The 7805 reads 4.89V so I guess the power is fine. So I guess the next step is to buy a new ULA and see what happens. Thanks all. And sorry to be scrounging for help in my first thread. I promise give more useful input when I have a working...
- Mon Jan 04, 2010 11:17 am
- Forum: Hardware
- Topic: DeadX81 - power supply?
- Replies: 10
- Views: 17303
Re: DeadX81 - power supply?
Pardon my idiocy but, say, I'm sitting here with Zx81 opened and powered up - multimeter in hand. Where do I stick the prongs to test for this 5v?