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ZX Spectrum issue 4B acquiredI recently acquired a ZX Spectrum with serial number 138-363292 on the case, and a 1983 issue 4B board I got it for the purpose of repair. and have…
... the case, and a 1983 issue 4B board
I got it ... some initial images of the board:
[img]https://dl.dropboxusercontent ... -
bizarre error on a grey ZX Spectrum+2 - the long search for a small problemHi, I got a ZX Spectrum+2 that worked a bit but crashed while loading or running 128k games. I installed a 128k-test-ROM that told me about RAM fa…
... ; no effect
* changing the ULA and the gate array 40058 ... text here mention to an issue 3 board of a grey ZX ... -
Spectrum 48+ 4S - Upper RAM issue, and now a self-created problem!I recently picked up a known-flaky spectrum off eBay, to have a bit of fun fixing it and reliving youth. It was labelled as 'keyboard duff, shows…
... ]
After that, the board still booted and showed RAMTOP ... latter likely to be the issue, and any guesses to what ... on the bottom of the board. I've removed the enamelled ... etc? I've received a board from Don Superfo in the ... -
Issue 2 problem.Hi all, I'm trying to repair / upgrade an Issue 2 Spectrum for a friend, but have come accros the following problem. When I power the machine …
... trying to repair / upgrade an Issue 2 Spectrum for a friend ... spares box, and swapping the ULA with another working one.
Looking for advice on building a HarlequinNew member here. From the US. My first computer was a Timex Sinclair 1000 back in the early 80s (in fact, I got one of the first batches sold in th…
... get past the PAL/NTSC issue. I did have a TS ... 've got a Rev G board inbound and I've scrounged ... 've purchased Chris Smith's ULA book and am anxious to ...Issue 2 speaker , coil and ModulatorHi, If you have any/all of these parts available I'd like to purcahse them, I'm attempting to resurrect a junk issue 2 board wuth lots of missing it…
Hi,
If you have any/all of these parts available I'd like to purcahse them, I'm attempting to resurrect a junk issue 2 board wuth lots of missing items.
ThanksZX-Paintbrush and global palette and ula+ supportHello, I think I need some help for the palette issue of ZX-Paintbrush. I want to check whether the way I'm about to clear the palette handling i…
... some help for the palette issue of ZX-Paintbrush. I want ... the user activates ula+ feature (by opening the ula+ palette editor, ... /> When I now enter the ula+ palette editor...
[img] ... with the new option "Deactivate ula+ palette". This switches back to ...ZX Diagnostics v0.35 ReleasedHi all, I'm pleased to announce the release of zx-diagnostics v0.35, downloadable from [url="https://github.com/brendanalford/zx-diagnostics/relea…
... release to support Dandanator Mini board
Deprecated ... beeps if a RAM issue is detected in soak ... /Sinclair joystick to select testcard / ULA / soak testing
- ... :
- Fix issue with Timex port conflicts during ULA test
- ...Lower & upper ram IC's for an issue 3 please.Would any of you great folks have 1 spare lower ram, and 1 spare upper ram IC's you would be willing to sell. I'm fixing up a poorly Spectrum that is…
... Emperor keyboard. It has an issue 3 board. Running diagnostics has highlighted ...48k Issue 6a Very sick indeed.Hi Guys. I have a 48k Issue 6a board that shows a white screen with grey border. The white screen has three black squares spaced equally on the le…
... /> I have a 48k Issue 6a board that shows a white screen ... RAM, switched ram from another board, without any change in symptom ... it's soldered into the board rather sloppily, it may be ... ok, whats the next potential issue that would give me these ...48k packed up after cap changeHi all, I'm relatively new to the Sinclair world, my 8-bit repairs in past was lurking in the dark sides of Acorn, Amstrad and Commodore! I've got…
... models, an original case 48k issue 3, and 3 plus models ... issue between the Z80 and the ROM and/or ULA. Swapping the ULA ... IC's to a prototyping board and make a hand wired ... open circuit on the board. However, only the issue 6A now works ...ZX Spectrum Issue 2 - 12V badHey there, I'm currently attempting to fix a ZX Spectrum issue 2 that I recieved. Overall the machine was generally working when I recieved it, bu…
... to fix a ZX Spectrum issue 2 that I recieved.
ULA & LM1889 are confirmed working ... to power a different Spectrum - Issue 3B IIRC), using a 1A ...Broken Issue 2 - likely culpritsI've just got hold of an issue 2 spectrum with an interesting layout (heatsink is vertical and goes down to the speaker, some variable resistors and …
... just got hold of an issue 2 spectrum with an interesting ... . I'm assuming z80 and ULA are working for it to ... far and a lower RAM issue is also questionable as again ... get that far. Maybe an issue with a chip as it ...Spectrum 48K / composite mod / LCD TV: voltages out of the ULAHello Spectrum World I have juste bought again my first computer on ebay... a Speccy 48k issue 2 with a 5C112E-2 ULA. Just had to replace TR4 and …
... a Speccy 48k issue 2 with a 5C112E-2 ULA. Just had ... maybe a problem in the ULA could cause b) or ... book "The ZX Spectrum ULA: How to design a ... /> Patrick
My ULA Y output:
[img]https ... ://i.postimg.cc/HxDsHvPC/ULA-Y.jpg[/img]
...ZX81 composite modHi guys. I have picked up a ZX81 untested for a few quids. I do have a problem tuning it correctly on a Crt TV. I cannot get better than a wavy black…
... press keys). I assume the ULA may be ok but ram ... and repair. The board is an issue 1 with Ula marked 2C184E.
Replacing voltage regulators - need to sanity check a few things pleaseHi Everyone I'm in the process (with a lot of help from some friends at Greenford Computer Club), of giving my three Speccys some much needed prev…
... +2 Grey (Issue 3 board)
Spectrum 48+ (Issue 2 board, was a rubber ... greatly appreciated.
[b]ULA heatsinks[/b]
As the ... a heatsink to the the ULA without needing to desocket it ... 'll need to pull the ULA out of the +2 in ...Another Spectrum is brought back to life.Hi Spec-chums. I have been having bit of busy afternoon with repairs today. I've brought back to life a Panasonic Super-VHS recorder, and more intere…
... an issue 2 16k ZX Spectrum board. The issue 2 board was ... a mess of the board with poor soldering/skills ... br /> So to begin, this board was an eBay buy. Described ... the ULA ic. Pictures in the auction showed the board ... to fit a ULA and get the board to display ...48K Issue 2 RAM issuesI have 48K issue 2 board (I've checked, the upper memory is present!). It's not very well. I've not attempted to diagnose one before, so please bear …
I have 48K issue 2 board (I've checked, the upper ...ZX Spectrum 48K Issue 4B No soundHi, I have a ZX Spectrum 48K Issue 4B without sound. I tested the ULA on another Spectrum and works fine, tested the speaker and it has the correct …
... Spectrum 48K Issue 4B without sound.
I tested the ULA on ... , tested continuity from pin 28 ULA to emitter of TR7 no ... this is ok for an Issue 4B. I checked the diagram ...48k issue 4B display problem etchi,, i have a zx spectrum 48k issue 4B with a display issue it has wavy lines in both the border and paper,some colours seem worse than others ie red…
... zx spectrum 48k issue 4B with a display issue it has wavy ... composite mod with the same issue.. i have tried everything short ... ,new lower ram module.different ULA,crystals,full re cap,disabling ...Speccy 4A board problemHi all. I was hoping for some help with my Speccy (with 4A Board) before I send it off for repair. When I power it on all looks fine (i.e. copyright …
... with my Speccy (with 4A Board) before I send it off ... screen. I've swapped the ULA with a known good one ...zx spectrum ULA upgradei have a issue 2 zx spectrum 16k which i upgraded to 48k .. i believe the ULA is faulty (ULA5C112E-2) .. seems intermittent i know a later one can be…
i have a issue 2 zx spectrum 16k which i upgraded to 48k .. i believe the ULA is faulty (ULA5C112E-2) .. seems intermittent i know a later one can be used but should some resistor values be changed to match it ?
thanks mark ..Repairs and Reparing.Hi All, Just finished resurrecting an Issue 3A board. Had black lines, so replaced the lower 16K RAM chips, Amazed they just cost a couple of doll…
... /> Just finished resurrecting an Issue 3A board. Had black lines, so replaced ... wondering, amongst those who fix board, what usually breaks on these ... 'm terrified of losing a ULA as I imagine they are ...Spectrum Abuse...Just got some new Spectrums in to repair ( I find it a great way to relieve stress, excepting when I do something daft while fixing them... ) One …
... No video, no clock. ULA seems dead, but no video ... board and seems someone decided to change C65 on an Issue ... the top of the board were completely missing. Like ... top of the board. Both upper board tracks were completely ... what they did to the ULA to stop it working. ...Interface 1 ULAIs there a technical description of the functionality of the Interface 1 ULA, similar to the "The ZX Spectrum ULA" book? Specifically, what is the…
... functionality of the Interface 1 ULA, similar to the "The ZX ... Spectrum ULA" book?
Specifically, what ... the ROMEN lines of the ULA? Superficially, ROMCS feeds into the ... , and ROMEN selects the on-board ROM, but they are also ...48k S-video output -- pcb board (credits 1024MAK & RGA24) just fitted a revision A of the s-video board to a issue 2 specie and i am very impressed with the results. the picture is…
... of the s-video board to a issue 2 specie and i ...Built a ZX Spectrum that works, but can't get the upper RAM to work?Like the title says I finished my Spectrum 3B board, and it boots, but it doesn't see the upper 32k of RAM. When it boots, the lower 16k works f…
... I finished my Spectrum 3B board, and it boots, but it ... my oscilloscope (on both the ULA and CPU), however, the voltage ... my Spectrum+ with a 6A board.
Both before and ... pulling A15 low is the issue, but what could do that ...Spectrum board Issue numbersWhilst cataloging my spectrums I am documenting the issue numbers of the motherboards. so far I have (all spectrum or smegtrum + Issue TWO 3 3B …
... the rubberkey boxes is an issue one - note the key ...
you can spot an issue 1 pcb by the 'dead ... to the ULA timing - though a very few early issue 2's ... used the same ULA so also ... with the mezzanine add on board - ones with the Sinclair ...How much power can I pull from a +3?Hi guys (and gals), Does anyone know how much of a load I can draw from the 5 volt line (lower pin 3of the expansion port)? I'm needing between 500…
... heat is less of an issue.
Looking inside one ... on a separate piece of board like some have.
board consumes less power than other spectrums (ULA!), so there ...When is a clone not a clone?If a Spectrum is built from scratch, using new components where available, is it a clone, copy or something else? See, I won an unpopulated Spectrum…
... the standard Issue 6 ULA, but is built on an unpopulated board, from ...
