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Sinclair 128k available?Hello there, Spectrum fans! Let me introduce myself. I am from Russia, my name is Dimitri. In the 90-s I was working for a firm producing ZX Spectru…
... models, with the exception of issue 1, 16k machines.
issue 1, but only the populated PCB (no case ... -
Spectrum 128 malfunctioning with DIVMMCI recently got myself a spectrum 128 (toastrack) and a DIVMMC card so I could load games from it. It all works fine until it has warmed up and then t…
... it's definitely a heat issue - but the only components getting ... power supply or the Spectrum PCB. You won't see it ... other chips on the Spectrum PCB a hard time. You can ... : this might be a common issue with your Speccy model. -
48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…
... next step should be to issue the following commands, and let ... removed that 74LS00 from its PCB (but left the wiring). I ... -
Dot crawl?Hi, As I'm rather new to the hardware of the spectrum, just to confirm: is this video showing "Dot crawl" ? [url]https://www.youtube.com/watch?v=_U…
... why (it varies on different issue boards), but I suspect it ... even better) on the Spectrum PCB [I]may[/I] help.
VERY loud beeper!!I recently replaced a dead beeper with another from an old set of headphones, only this is MUCH louder! Is there a way of bringing the volume down a …
... anything other than a naked issue 1 PCB to hand at the ...Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... 3/4 links on the PCB for - to ensure that the ... as a replacement in any issue machine regardless of link settings ...Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... 3/4 links on the PCB for - to ensure that the ... as a replacement in any issue machine regardless of link settings ...Spectrum 48k picture quality distorts after 10 minsWould this be something to do with capacitors? the picture is fine then after 10 mins of play the quality goes bad sort of like the some of the colou…
... not, it's probably an issue 2 which is prone to ... via VR1/VR2 on the PCB.
You'll find ...48k issue 2I have an issue 2 spectrum 48k and wanted to know if i wanted to change the z80 is ther any fix so i dont have that 1 component hugging the z80 [img…
... transistor on the Z80 in issue 2 boards is there to ... electrically connected to the same PCB connections, but positioned elsewhere on ...48k issue 2I have an issue 2 spectrum 48k and wanted to know if i wanted to change the z80 is ther any fix so i dont have that 1 component hugging the z80 [img…
... 've just been transplanting an Issue 2 board back into a ... the pin 11/pin 30 PCB holes, refitting the socket then ...AAAARRRRR DIV-MMC ENJOY againIve recently been posting trying to get to the bottom of problems with my +48 not working with this rechid addon.Now ive finaly worked out theres not…
... .
Markings on the PCB are pretty clear, so you ... able to locate them without issue :)
BZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
... double sided, through hole plated PCB. Let alone all eight ... the schematic for the issue 4A/4B has a ... error is in the issue 4B part of the schematic ... , the issue 4A part has this part ... silk screen print on the PCB).
Next replace ...Spectrum rubber key memory upgradeIf a 16k spectrum has a 32k fox upgrade kit installed anyone any idea what board revision we would be expecting to find in this machine? And was this…
... needs touching.
Only issue 3 boards and up have ... Fox kit has a piggyback PCB going into one of the ... to be used in an issue 2.
BZX Spectrum 48K Issue 3, loss of -5V rail.Hi all, I've googled this problem and poured over the electrical diagrams for the circuitry concerning the power supplies and I believe I know what …
... display produced, not of the PCB :razz:
When we ... LRR module installed in an issue 4A board, if you're ...The ULA6C001E-5...Hi everybody, I have been continuing my Quest for the Holy ULA, and have today taken delivery of a ULA6C001E-5. Now, the -6 was used in Issue 3 boar…
... case with a more recent PCB, either a swap by ...
001-052167 Issue two FERRANTI ULA5C112E 8240
???-?????? Issue two FERRANTI ULA5C112E 8240
001-086023 Issue two FERRANTI ULA5C112E-2 8244 ...ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
... -3 week strugglings with an ISSUE 6A Spectrum. At the end ... a dirt spot on the PCB under a memory IC socket ... 's worth to check the PCB with a lupe and clean ...Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…
... />
001-183825 green, Issue 2 board, fitted with Eprom ... br /> D22-990051 red, Issue 3b board, fitted with ... br /> D01-254093 green, Issue 3b board
D01- ... black on white sticker, Issue 2 board, switchmode 5v ... backplates so the wrong pcb may be on the ...+3 edge conn issueHi all, Long time 48k user, but recently bought a +3 off Ebay for fun. I made the composite video mod and have her up & running but, Have tried my …
... to do it with the PCB out of the case for ... to fix the sound distortion issue too, see [URL="http://alistairsserver ...RAM issue for potential 48k buy?Hi guys I've got a 48k in my sight for ?20 but... it has an issue: [QUOTE]"I tested the computer and only displayed a distorted screen. Coloured …
... want to avoid damaging the PCB. If the Spectrum is more ... to the 7805 of that issue 2 Spectrum before powering it ...Next step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …
... that would be for issue 4B). That would place ... of the PCB, as suggested by this (issue 3!) ... technical-docs/ZXSpectrumIssue3-Layout.gif"]PCB layout.[/URL]
< ... cicuit diagram for the issue 4A I found [ ... not find in the issue 3 PCB layout). :confused:
ZX81 Unwell... TV or The ZX81??Hi all I finally got a RF cable today so i could test my ZX81 at last... sadly it's not great news although I'm hopeful that it's the TV...? All I'…
... before its got the red PCB...
I think I ... likely to be a TV issue.
Paul1st interface in 30 years (update)Hi all, Just a wee update to my "1st ZX interface in 30 years" project. Main IC's: 82C55 three 8-bit port I/O (configured for 12 dig in, 12 dig out…
... a start on the proper PCB. I thought I'd share ... accepted by the ADC. The issue has gotta be due to ... be designing up a proper pcb which will have all the ...'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…
... /> Don't know about that, issue two boards came with both ...
Some very early issue two's even came with ... the issue 1 5C102E ULA :)
< ... can be tested in an issue 3B but may exhibit ... issues in a 4A upwards PCB.
BStereo sound board on toastrackI've got one of bverstee's stereo sound board for my +2A and it is absolutely brilliant - I'm wanting to fit one to my toastrack as well as the sound…
... board would cause some level issue when recording from it to ... clean too, not modifying the PCB any more than I have ...'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…
... 't know about that, issue two boards came with both ...
Some very early issue two's even came with ... the issue 1 5C102E ULA :)
... can be tested in an issue 3B but may exhibit ... issues in a 4A upwards PCB.
B[/QUOTE]< ...C46 Capacitor MarkingHi all I've just watched this part of this video: [url]http://www.youtube.com/watch?v=TeCVt2T-YSo&t=17m0s[/url] And he says the marking is incorrec…
Look at the (issue 2 Spectrum) circuit diagram. For ... for continuity between C46's PCB pads and those other locations ...16k to 48K upgradeHi everyone I was just wondering if anybody knows if it is possible to upgrade a 16k Speccy to a 48k with the required RAM chips. If this is possibl…
... /> Lastly, depending on the board issue some wire links will need ... can see this on the PCB silkscreen at the bottom when ...Issue 4s - Not 'Jailbars' but lines alloverIt's not another 'Jailbars' question!, but I've got this Issue 4S that aside from the 'Jailbars' on the Paper area of the screen which I can live wit…
... think it's even board issue related, as I've got ... two issue 6 boards:
1 ... combination of components on the PCB and/or ULA batch that ...Damaged S2 IC 26?I'm after more advice, pretty please :) On my S2 board there appears to be a damaged chip, it looks to be IC 26 and is marked as 74LS158PC, it appea…
... selection links in the issue 2 and issue 3 circuit diagrams.
The issue 2 PCB is set up only for ...ZX81 and Analogue TVsI recently bought a really nice ZX81 on ebay in amazing condition, but I'm having issues tuning in an old analogue TV to lock onto the signal. I und…
... board (PCB) issues that were manufactured: issue 1 and issue 3. Issue 1 boards ... resist layer on the bottom. Issue 3 boards generally have a ... solder resist layer, however early issue 3 boards use a green ...
