Search found 5103 matches
- Thu Mar 28, 2024 9:30 pm
- Forum: Hardware
- Topic: ZX Spectrum +2a issue with all expansion cards
- Replies: 7
- Views: 367
Re: ZX Spectrum +2a issue with all expansion cards
Not sure it's the ULA. Depending on which version (there were a surprising number not including the various clones), a basic Kempston joystick interface only typically uses the eight data bus lines (D0 to D7), address line A5 (and sometimes A6 and A7), /RD, /IORQ and sometimes /M1. And obviously, +5...
- Thu Mar 28, 2024 6:19 pm
- Forum: GAMES
- Topic: how to make something intentionally crappy for the CGC 2024
- Replies: 23
- Views: 1706
Re: how to make something intentionally crappy for the CGC 2024
Yes, I think you can use those.
Mark
Mark
- Thu Mar 28, 2024 7:48 am
- Forum: Welcome Area
- Topic: Hiya from voorsk
- Replies: 3
- Views: 131
Re: Hiya from voorsk
Hello and welcome to our forum Graham! :D :D :D I hope you enjoy this forum :D You are welcome to ask questions! I've not heard of the ULAdigitizer before. It looks like it either copies the video data from the ULA data bus when the ULA reads the video data from the 'lower' RAM, or when the Z80 wri...
- Sun Mar 24, 2024 5:25 pm
- Forum: GAMES
- Topic: how to make something intentionally crappy for the CGC 2024
- Replies: 23
- Views: 1706
Re: how to make something intentionally crappy for the CGC 2024
No, you can use any computer language that was/is available for the Sinclair machine you are using.
Mark
Mark
- Sun Mar 24, 2024 5:23 pm
- Forum: SALES
- Topic: Best tan ever on a ZX80?
- Replies: 1
- Views: 176
Re: Best tan ever on a ZX80?
No
Mark
Mark
- Sat Mar 23, 2024 8:19 pm
- Forum: Hardware
- Topic: how to verify if a multiface 1 is working ??
- Replies: 11
- Views: 523
Re: how to verify if a multiface 1 is working ??
Two things:
The Opus has its own bank switched / paged ROM/RAM system, so there must be a switch or something to prevent clashes between them.
The MF1 looks to be missing a lot of logic chips.
Mark
The Opus has its own bank switched / paged ROM/RAM system, so there must be a switch or something to prevent clashes between them.
The MF1 looks to be missing a lot of logic chips.
Mark
- Sat Mar 23, 2024 2:14 pm
- Forum: Hardware
- Topic: how to verify if a multiface 1 is working ??
- Replies: 11
- Views: 523
Re: how to verify if a multiface 1 is working ??
I'm guessing, but I would have thought that if the RAM was faulty, you would get different symptons. Is it really permanently soldered to the Speccy :shock: That makes it awkward... Have you checked for solder splashes and short circuits? Also open circuit / bad connection issues? This site has some...
- Sat Mar 23, 2024 2:10 pm
- Forum: Hardware
- Topic: What to do with an unusual ZX81?
- Replies: 7
- Views: 371
Re: What to do with an unusual ZX81?
If it's any help, the ZX Spectrum issue 1 (and some early issue 2) boards that have a different "dead bug" daughter board tend not to be modified (unless they were back in the day). You don't need to snip any wires. Just desolder the two wires going into the modulator from the PCB and secure them so...
- Sat Mar 23, 2024 11:11 am
- Forum: Hardware
- Topic: ZX Spectrum 16K keyboard issue - not all keys works
- Replies: 2
- Views: 151
Re: ZX Spectrum 16K keyboard issue - not all keys works
Hello and welcome :D The first point is that the keyboard is a matrix of eight half rows (five keys in each half row) and five "columns" (eight keys in each column). Hence there are two groups forming the connection to PCB (one of eight and one of five). A hairline fracture in one of the metal layer...
- Fri Mar 22, 2024 11:49 pm
- Forum: Hardware
- Topic: What to do with an unusual ZX81?
- Replies: 7
- Views: 371
Re: What to do with an unusual ZX81?
Hmm, being the electronics nerd that I am, I was thinking that those are a useful source of a couple of 74 series logic chips... :ugeek: :twisted: :lol: Mark PS i have plenty of run of the mill issue 1 and issue 3 boards to tinker with. A long time ago in a universe far, far away, I bought around 5 ...