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No serial numberI recently bought a 1982 issue 2 spectrum which I believe is a 16k upgraded to 48k. There is no serial number on the case. Does anyone know why th…
... capacitor and resistor to the power circuit. And the composite mod and ... replaced the power transistors. Just waiting for a ... -
Power issues on a 6A 48 K SpectrumHello all! I decided to take another look at my 6A Spectrum that I broke via a bad joystick adapter, I’ve removed the bottom 16K ram and replaced…
... , something destroyed the power circuit with the short circuit of the edge connector ... -
Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…
... and checked them against an issue 3 I have. Nothing ... and checked IC26:
Issue 3 (working):
1 ... /> 16 1.879k
Issue 3b (non-working):
1 ... board over though. Although that issue 3 has been upgraded from ... -
Speed (nano seconds) of memory chips ZX SpectrumThe ZX Spectrum uses 4116 memory for the lower memory, which can be replaced by other sorts or a whole, modern, module, but when searching for 4116 m…
... , not nanoseconds. :) Total non-issue unless the circuit itself is designed wrong ... -
Board schematic files.Where do I go to download Board Layout and Schematics these days?- All up to Issue 6a boards. It's time for some tinkering!
... service manual 1984 ( up to issue 3B board )
The Sinclair ... + service manual 1985 (up to issue board 6A ) I have three ... -
ZX Spectrum+ new membrane not working properlyHi! I recently got myself a ZX Spectrum+ . It had the classic broken membrane problem (most keys didn't work and those that did were wrong). So I or…
It is an issue 3B. This happens with the following ... -
Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …
... changed inadvertently by the new power circuit to the PCB and this ... -
how to load stuff from pc to spectrum?ok tried a few utilities but none seem to produce enough volume. tried a issue 2 and 3b. the only one that works mostly is an issue 4s. do I need som…
i thought so. yes I'm using my original cable that came with the speccy. I used a pc last night and managed to get the issue 3b to work, but the issue 2 still doesn't like the level. the 4s seems the most tolerant. -
Rubber key case bottomI'm looking for a 16/48k case bottom to replace my current one that is slightly warped from heat.
It's an issue 3B.
Paypal ok with you?
Thanks! -
help with my original issue 3b from when i was a teen. possible lower ram fault.hello, well ive tried to fix my old speccy, but haven't made much progress. could you help me out with some diagnosis. the fault occurred about…
I see, I got it wrong, you have the PCB issue 3b. So the test ROM would help as Mark mentioned above. -
help with my original issue 3b from when i was a teen. possible lower ram fault.hello, well ive tried to fix my old speccy, but haven't made much progress. could you help me out with some diagnosis. the fault occurred about…
... -board DC-DC converter / inverter power circuit are the two main electronic ... -
Upper memory not available in issue 2A friend send me his issue 2 Spectrum for diagnosis. It boots okay but for some reason won't load games over 16kB. He sent also a Smart Card with int…
... revision, though. Issue 2 on the malfunctioning and Issue 3B on the working ... -
Spectrum 48k Power Supply?Guys - I've got a Spectrum 48k inbound from the UK. I want to scrounge a power supply to use when it arrives. What size jack did it use and what ar…
Which board issue is it?
Early versions ... DC approx. (problem corrected on issue 3B and all following board versions ... have a choice. Although all issue boards will work with a ... -
Spectrum 48k Power Supply?Guys - I've got a Spectrum 48k inbound from the UK. I want to scrounge a power supply to use when it arrives. What size jack did it use and what ar…
[quote="1024MAK;896559"]Which board issue is it?
Early versions ... DC approx. (problem corrected on issue 3B and all following board versions ... have a choice. Although all issue boards will work with a ... /> I don't know what issue board it is yet, it ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... old capacitors out of this Issue 3b board . The keyboard connectors were ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
Issue 3B is the next one to ... /> I have just taken the Issue 3B out of an LMT keyboard ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
Issue 3B Mystery
This was ... as I had done an Issue 3 before (now recased) So ... it up as on the Issue 4 these pads are tracked ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
The LMT Keyboard and the Issue 3B Spectrum
Pictures like ... -
Trying to repair a Speccy 48k - No PulsingI've had this machine for ages. I'd I've been putting off fixing it for some time now. So a couple of days ago I pulled it apart and started prob…
... , so I'm assuming the issue 3B is a Samsung made unit ... -
Trying to repair a Speccy 48k - No PulsingI've had this machine for ages. I'd I've been putting off fixing it for some time now. So a couple of days ago I pulled it apart and started prob…
... legs. By looking at the issue 3B schematic, and using a multimeter ... -
Trying to repair a Speccy 48k - No PulsingI've had this machine for ages. I'd I've been putting off fixing it for some time now. So a couple of days ago I pulled it apart and started prob…
... "]here [/url]of a Samsung issue 3B PCB. Does your board look ... -
Trying to repair a Speccy 48k - No PulsingI've had this machine for ages. I'd I've been putting off fixing it for some time now. So a couple of days ago I pulled it apart and started prob…
... "]here [/url]of a Samsung issue 3B PCB. Does your board look ... -
Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …
... on when tested on various power sockets . But was my hearing ... -oxidize them) got the whole power set up going again ? Or ... the Opus chips prevented a power circuit from forming and this explains ... -
Spectrum repairs[edit - sorry! wrong section, if someone can move please] I'm in contact with a seller on Gumtree. He was selling a 48k Spectrum, fully boxed and…
... out the DC/DC inverter power circuit, which in turn killed more ... -
Trying to repair a Speccy 48k - No PulsingI've had this machine for ages. I'd I've been putting off fixing it for some time now. So a couple of days ago I pulled it apart and started prob…
... normal for issue 1 to issue 3 boards.
From issue 3B boards ... -
Trying to repair a Speccy 48k - No PulsingI've had this machine for ages. I'd I've been putting off fixing it for some time now. So a couple of days ago I pulled it apart and started prob…
... So I grabbed my working Issue 3 Speccy (with composite mod ... ULA
The issue 3B which I’m trying to ... ULA into the non-working issue 3B and it didn’t ... ULA will work in an issue 3B and a 6c001e-7 ... dead
2) The issue 3B has other issues beyond a ... -
problem loading/playing gameshello to all! i was last active at this forum 11 years ago, and here goes the same thing :) found my old speccy, did the composite mod, managed to …
... /> i am looking at my issue 3b board and i seem to ... -
problem loading/playing gameshello to all! i was last active at this forum 11 years ago, and here goes the same thing :) found my old speccy, did the composite mod, managed to …
... 't know that there were issue 3b boards with only 16k of ...
