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Search found 641 matches
- Tue Sep 26, 2023 1:52 pm
- Forum: Sinclair Miscellaneous
- Topic: Did Pope John Paul II own a ZX Spectrum?
- Replies: 12
- Views: 318
- Thu Sep 14, 2023 12:29 am
- Forum: ZXDB Fixes
- Topic: ZX80 v. ZX Spectrum
- Replies: 24
- Views: 506
- Wed Sep 13, 2023 9:51 pm
- Forum: ZXDB Fixes
- Topic: ZX80 v. ZX Spectrum
- Replies: 24
- Views: 506
Re: ZX80 v. ZX Spectrum
That's not worldofspectrum.org anyway...
- Wed Sep 13, 2023 6:40 pm
- Forum: Hardware
- Topic: Spectrum 128K +2 Fault Conformation?
- Replies: 12
- Views: 309
Re: Spectrum 128K +2 Fault Conformation?
You can find the schematic for the tape board in the +2 service manual https://spectrumforeveryone.com/wp-cont ... Manual.pdf
The short would be something after the inductor, possibly C323 if it's not a short in the motor or switch wiring.
The short would be something after the inductor, possibly C323 if it's not a short in the motor or switch wiring.
- Wed Sep 13, 2023 6:04 pm
- Forum: Hardware
- Topic: Spectrum 128K +2 Fault Conformation?
- Replies: 12
- Views: 309
Re: Spectrum 128K +2 Fault Conformation?
It's not a resistor, but an inductor. The value according to the schematic is 82μH. For it to have burnt up something else in the circuit is presumably shorted out. Do you mean that when you plug the tape board in it kills the machine? That would be consistent with it having a short on the 5 volt ra...
- Mon Sep 04, 2023 4:24 pm
- Forum: Announcements
- Topic: Woot 2023 - Submissions wanted
- Replies: 72
- Views: 2995
- Mon Sep 04, 2023 1:41 pm
- Forum: Announcements
- Topic: Woot 2023 - Submissions wanted
- Replies: 72
- Views: 2995
- Mon Aug 28, 2023 10:51 am
- Forum: Hardware
- Topic: External Gotek on +3
- Replies: 5
- Views: 187
Re: External Gotek on +3
I seem to remember reading that @Guesser frowned on using such things, but I've never had any issues (touch wood!). The issue with the drive swap switch arrangement is that they short the output of IC18a directly to ground. :shock: (It also stops you from copying stuff to the internal drive, but th...
- Mon Aug 14, 2023 3:44 pm
- Forum: Emulators
- Topic: New snap format that convenient for view/modify
- Replies: 59
- Views: 1240
Re: New snap format that convenient for view/modify
Why guess if there is a specification. Luckily emulator authors are always very well behaved when implementing snapshot export code, so finding snapshots with data stuffed into unused/reserved bits from an original specification to support extra hardware for their particular emulator basically neve...
- Mon Aug 14, 2023 1:07 pm
- Forum: Emulators
- Topic: New snap format that convenient for view/modify
- Replies: 59
- Views: 1240
Re: New snap format that convenient for view/modify
So what you have to offer instead? Use szx because it's not perfect but most of the bugs caused by confusing design issues have been squashed out of everyone's implementation by now. Or create something new where every piece of configuration and memory block is its own block with extensible tags so...
- Mon Aug 14, 2023 11:24 am
- Forum: Emulators
- Topic: New snap format that convenient for view/modify
- Replies: 59
- Views: 1240
- Mon Aug 14, 2023 11:04 am
- Forum: Emulators
- Topic: New snap format that convenient for view/modify
- Replies: 59
- Views: 1240
Re: New snap format that convenient for view/modify
If you want to have yet another new snapshot format that no-one supports the usual route is to write another emulator.
Or you could write a converter from szx but in that case you may as well put your coding effort into an szx viewer/editor that might be useful
Or you could write a converter from szx but in that case you may as well put your coding effort into an szx viewer/editor that might be useful
- Mon Aug 07, 2023 12:08 pm
- Forum: Programming
- Topic: A Spectrum PCM player...
- Replies: 9
- Views: 292
Re: A Spectrum PCM player...
Gasman released one many years ago (used for speech samples in his game Celebrity Arses iirc) that I think he called "samplepack". Later someone else made a windows exe (wav2ay?) to do the conversion instead of using Matt's original perl script. It generates correctly weighted 4-bit sample...
- Wed Aug 02, 2023 7:22 pm
- Forum: Other Retro Stuff
- Topic: Anti-Piracy Message Generator
- Replies: 7
- Views: 403
Re: Anti-Piracy Message Generator
This one creates great output (but you have to think of things you wouldn't do yourself )
https://youwouldntsteala.website/editor.html
https://youwouldntsteala.website/editor.html
- Thu Jul 27, 2023 12:55 am
- Forum: Hardware
- Topic: REALLY technical details about the Spectrum loading signal
- Replies: 10
- Views: 563
Re: REALLY technical details about the Spectrum loading signal
The spectrum doesn't really care about audio waves. All it's interested in is edges , and the number of clock cycles that pass between them. https://sinclair.wiki.zxnet.co.uk/wiki/Spectrum_tape_interface The reason you see 16 1 bits at the start is because the data block starts with FF to indicate i...
- Sun Jul 16, 2023 1:58 pm
- Forum: Sinclair Miscellaneous
- Topic: Pure 'What if'-ery: The ZX Spectrum 8K and 256K models
- Replies: 27
- Views: 934
Re: Pure 'What if'-ery: The ZX Spectrum 8K and 256K models
A 256kB speccy would have been a complete waste of money as almost nothing would use all that memory. Look at how much actually made use of floppy disks...
- Mon Jul 03, 2023 3:20 pm
- Forum: Games/Software
- Topic: What is a "stonker" anyway?
- Replies: 28
- Views: 721
- Mon Jul 03, 2023 1:15 pm
- Forum: Hardware
- Topic: ZX Spectrum 128K ULA replacement
- Replies: 17
- Views: 607
Re: ZX Spectrum 128K ULA replacement
Sure it's not hermetically sealed, but it would be a bit of a stretch to call the rubber key 48 ventilated. A few slots on the base covered by the PCB, and the edge connector slot blocked off by a peripheral can't be conducive to much convection.
- Tue Jun 27, 2023 2:26 pm
- Forum: Hardware
- Topic: Spectrum 128K display disappears?!
- Replies: 18
- Views: 394
Re: Spectrum 128K display disappears?!
There is a service manual for the 128 but it's rather vague and I'm not an expert on the power supply circuit. Likely TR4 is dead, but might not be the only thing.
pinging @balford
pinging @balford
- Tue Jun 27, 2023 12:54 pm
- Forum: Hardware
- Topic: Spectrum 128K display disappears?!
- Replies: 18
- Views: 394
Re: Spectrum 128K display disappears?!
Definitely a problem with the switching supply circuitry in that case
- Tue Jun 27, 2023 10:32 am
- Forum: Hardware
- Topic: Spectrum 128K display disappears?!
- Replies: 18
- Views: 394
Re: Spectrum 128K display disappears?!
It does sound poorly. First thing I'd do if you're not getting anything from the UHF output is check voltages to see if you have 12V to the video chip
- Tue Jun 27, 2023 10:30 am
- Forum: Hardware
- Topic: Spectrum 128K display disappears?!
- Replies: 18
- Views: 394
Re: Spectrum 128K display disappears?!
[deleted]
- Tue Jun 27, 2023 8:55 am
- Forum: Hardware
- Topic: Spectrum 128K display disappears?!
- Replies: 18
- Views: 394
Re: Spectrum 128K display disappears?!
Look at/take photos of the motherboard around the RGB socket, but also how we'd have to know how the SCART cable is currently wired too.
I'm guessing the cable's got a capacitor stuffed inside, connected to some signal line or other that made it sort-of-work previously.
I'm guessing the cable's got a capacitor stuffed inside, connected to some signal line or other that made it sort-of-work previously.
- Tue Jun 27, 2023 12:20 am
- Forum: Hardware
- Topic: Spectrum 128K display disappears?!
- Replies: 18
- Views: 394
Re: Spectrum 128K display disappears?!
Has the machine been modified to provide a proper RGB blanking signal?
- Fri Jun 16, 2023 11:44 am
- Forum: Hardware
- Topic: Edge connector through port
- Replies: 11
- Views: 269
Re: Edge connector through port
The other thing to realise is there's no one right answer, there's many ways to skin a cat, and how you design it will depend what kind of devices you need it to be compatible with. Like people making mass storage interfaces generally just don't bother at all trying to make them work with other simi...