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ZX Spectrum +3 repairI have my first +3 here, and it needs repairs. Hoping someone here can help me out. When I power it on I get this screen with black and white line…
... a "known issue" with RAM timings on the Black +2 and +3 ... on Z70833 issue 1 boards, and incorporated into the PCB on issue 2 and ... -
Need help from people with real 128/black +2 and grey +2A/+2B/+3.Please, if you have time and inspiration, run [url="https://www.worldofspectrum.org/forums/discussion/55518/test-of-screen-switching-timings"]this t…
... (it’s a +2B Z70833 issue 2). Do you know if your ... says “A”) is an issue 2 or issue 1? (Says on the logic board ... it probably has a Z70833 issue 4 logic board.
Need help from people with real 128/black +2 and grey +2A/+2B/+3.Please, if you have time and inspiration, run [url="https://www.worldofspectrum.org/forums/discussion/55518/test-of-screen-switching-timings"]this t…
... on the +2A or +2B issue 1 in your schematics, and it ... ’s optional on the +2B issue 2 (which is what I have ...Need help from people with real 128/black +2 and grey +2A/+2B/+3.Please, if you have time and inspiration, run [url="https://www.worldofspectrum.org/forums/discussion/55518/test-of-screen-switching-timings"]this t…
... .
On the Z70833 ISSUE 1 board it is the same ... with R45 removed.
ISSUE 2 and ISSUE 4 incorporate that circuit ... /> Without the fixes the Z70833 ISSUE 1 only likes certain brands of ... mostly limited to unmodded Z70833 ISSUE 1 boards a WoS member ...Need help from people with real 128/black +2 and grey +2A/+2B/+3.Please, if you have time and inspiration, run [url="https://www.worldofspectrum.org/forums/discussion/55518/test-of-screen-switching-timings"]this t…
... ;927796"]R45 is there on ISSUE 1 boards that haven't been ... issue 1 boards have this mod, some don’t.
2. All issue 2 and issue ... /> 3. R45 is present on issue 1 boards that [i]do not ... . The capacitor between D6 (issue 2) or D0 (issue 4) and VCC has ...Troubleshooting my +2To put this in context: a while back (i.e. late last year and earlier this year) I was looking to put together a compilation of modern Spectrum games…
... the +2B that's an issue 1 board and says +2A ... [quote="1024MAK;928422"]The (grey) +2 uses a ULA which is ... the tests with the +2, the yellow screen clearly ... production cost of each +2 Spectrum. It's also ... tiny cost savings on every +2, +2A, +3, CPC464, CPC664, ...Character wobbleHello, I have an Issue 2 board which shows vertical character wobble. This happens for a few minutes followed by a few minutes of character sta…
Keep in mind, that ULAs are backward compatible, but not the other way around. You can use the ULA from an Issue 4S board in any previous revision, but the ULA from an Issue 2 board will only work in another Issue 2 or Issue 1 board.Nasty vertical pattern on a 128K Toast Rack via RGBI managed to fix the busted membrane on my [url="https://www.worldofspectrum.org/forums/discussion/55755/got-myself-a-128k-toast-rack-plus-a-simple-a…
... me check on my grey +2 board issue 1.
Edit: The ... happens on Sega MD Mark 1 models, but usually changing sync ... better way to resolve the issue.Nasty vertical pattern on a 128K Toast Rack via RGBI managed to fix the busted membrane on my [url="https://www.worldofspectrum.org/forums/discussion/55755/got-myself-a-128k-toast-rack-plus-a-simple-a…
... on the 48K machines. The +2 is almost identical to the ... me check on my grey +2 board issue 1.[/quote]
Absolutely. The ... to a known good 128K/+2 machine, I could swap the ...Nasty vertical pattern on a 128K Toast Rack via RGBI managed to fix the busted membrane on my [url="https://www.worldofspectrum.org/forums/discussion/55755/got-myself-a-128k-toast-rack-plus-a-simple-a…
... I checked on my grey +2, board issue 1:
Picture with ... : checked on another grey +2 board issue 3 with RGB analogue cable ...Nasty vertical pattern on a 128K Toast Rack via RGBI managed to fix the busted membrane on my [url="https://www.worldofspectrum.org/forums/discussion/55755/got-myself-a-128k-toast-rack-plus-a-simple-a…
... I checked on my grey +2, board issue 1:[/quote]
Thank you ...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 …
... it aside in case another issue 2 comes my way. I don ... would be compatible with my issue 3a.[/quote]
No ... the way down to an Issue 1, but not the other way ...Parallel to serial z80 i/o portI have an Opus Discovery and an Alphacom 32 printer. I want to see if I can make a cable that will use the Opus Parallel printer port. The question i…
... but here's the issue
1) The Spectrum is attached ... Opus Discovery via a Multiface 1 and the Printer is attached ... the Opus Expansion port
2) I load "Zeus" from tape ...Dual joystick interface schematic?Hi! Would anyone have a schematic for a dual joystick interface? Cursor or sinclair would either work. If not, I might try my hand at designing one.…
... be set (and older Issue 1 and 2 boards did indeed behave that ...Better keyboard = better sales ?Just a random thought. I want to start this by saying although I did not have a + model new, I was never really a fan of this keyboard as it was n…
... some early machines (issue 1 and maybe some issue 2 boards) were not fitted ...Better keyboard = better sales ?Just a random thought. I want to start this by saying although I did not have a + model new, I was never really a fan of this keyboard as it was n…
... some early machines (issue 1 and maybe some issue 2 boards) were not fitted ... me speed was not an issue. It's only now that ...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 …
... (issue 1), 5C112 (issue 2) and 6C001 (issue >2): 3.4-3.6V for sync, 2.2-2 ... .5V for black, 1 ... .25-1.6V for pale ...Converting Issue 2 keyboard games to Issue 3Dipping back into the World of Spectrum (and no, not just this site) I was wondering if I could do a machine code job myself without having any under…
... to part with has an Issue 1 Z70833 motherboard, "+2A" on ... the case, has an Issue 4 Z70833 motherboard, and ... wasn't doing anything. 1, 2 and 3 appear to ... working with Spectaculator and an Issue 3 keyboard. And yet ... with my grey case +2 was sitting there doing ...Subject Areas That the Spectrum did not "get into" Yup, the Speccy covered a lot of ground but regrettably it did not "get into" these areas :- Psycholinguistics , Philology , and Sociometry . Any…
[quote="luny;955987"]Brown graphics (C64)[/quote]
The issue 1 and 2 can do brown if the presets (variable resistors) are maladjusted! :))
[b][i]Mark[/i][/b]Subject Areas That the Spectrum did not "get into" Yup, the Speccy covered a lot of ground but regrettably it did not "get into" these areas :- Psycholinguistics , Philology , and Sociometry . Any…
... (C64)[/quote]
The issue 1 and 2 can do brown if the ...Finding a good (UK) external switch mode power supply for the basic 48k and 128k ZX SpectrumsThis idea has probably "done the rounds" by now . I think I have heard about it a bit late . This thread with look at replacing the original "heavy l…
... applies to some capacitors on issue 1 and issue 2 ZX Spectrum boards).
48K ZX Spectrum 48K Recap (Capacitors) Or Not?I have seen arguments "for an against" on this subject by some "high calibre" experts . So if the experts can differ on this question then my questi…
... .
On the issue 1 and issue 2 boards, the electrolytic capacitor under ... , ZX Spectrum 128K, ZX Spectrum+2, +2A, +2B, +3, +3B, Acorn ...Donkey Kong And The Wrong ColoursI vaguely remember asking this question many years ago, but it seems worthwhile in the context of the frankly amazing hack/mods I've just discovered …
... RGB values. Especially the issue 1 and issue 2 boards where the colour output ...Bit of fun - one change onlyI also posted this on another marque's forum (for their products) to see. Its just a bit of fun really. OK, if you could of made one change to a S…
... rubber key machine. Well on issue 3 boards onwards, the heatsink ... (where it was on the issue 1 and issue 2 boards) to the very ...If Sinclair computers had not been sold...I was just having a random thought. If Sinclair Computers (or the rights to them, not sure how it 'worked' back then) had not been sold to Amstrad…
... known about before the issue 3 boards were produced:< ... 5C102E ULA (mostly issue 1 boards, but also early issue 2 boards) needed ... /O logic was found in issue 2 machines. Hence the ‘spider’ ... transistor ‘fix’. Issue 3 and later boards incorporated ...Bit of fun - ToastRack , one change onlyAlthough there's an old "one change only" topic about, I was thinking about the toastyrack 128's earlier. Its actually the only Spectrum model I've n…
... returned different results compared to issue 1 and issue 2 boards (the Ear/Mic ...Returning homeDear readers, for those who did not yet see it: I'm back. The home base (not baseball) of ZX-Modules is now at: http://zx-modules.de Still rebui…
... ZX-Blockeditor 2.4.3.1 & ZX-Editor 2.3.1.1... Neither of ... if it is merely an issue with the setup installation file ...Returning homeDear readers, for those who did not yet see it: I'm back. The home base (not baseball) of ZX-Modules is now at: http://zx-modules.de Still rebui…
... ZX-Blockeditor 2.4.3.1 & ZX-Editor 2.3.1.1... Neither of ... if it is merely an issue with the setup installation file ... of all, apologise for that issue. Yes, I guess it's ... will try to fix the issue. If this wont help, I ...
