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Composite video mod on +2 grey: same as 48k?Hello all, Sorry for the n00b question but I couldn't find an answer yet... I did a composite video mod for the 48k in the past. Now I got a 128k +…
... possible on a +2 grey issue 3?
Or would he need ... -
Strange ZX81 PCBHello I took apart my non-working ZX81 to attempt to fix it and I noticed that the resistors and diodes were soldered a bit strange. The wires are c…
Hmm.. I can only think that it was an assembly error in a small batch of boards that caused this.
Those boards are issue 3, and to my knowledge only issue 1 ZX81 boards were offered in kit form.
B -
Never saw that before on a black +2Today I opened a freshly arrived black +2. First I was amazed not to see an Astec HF modulator, then I spotted the "Issue two". So far I always found…
... /> I've never seen an ISSUE 3 in any of the photos ... [I]do [/I]have an ISSUE 3 Z70833 can I [B]please ... -
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 the ... to be used in an issue 2.
B -
X=Y=ZFirst public outing of X=Y=Z for the 48K Spectrum, a 4-level demo which can be download from: [as TZX] [URL="http://www.bobs-stuff.co.uk/extras/xyzd…
... .0) (tried with both the "Issue 2 Keyboard" setting ticked and ... in SpecEmu (with either Issue 2 or Issue 3 keyboard selected) so I ... whether this is a Fuse issue or something else. I will ... . Some sort of subtle timing issue, or floating bus ... -
X=Y=ZFirst public outing of X=Y=Z for the 48K Spectrum, a 4-level demo which can be download from: [as TZX] [URL="http://www.bobs-stuff.co.uk/extras/xyzd…
... .0) (tried with both the "Issue 2 Keyboard" setting ticked and ... in SpecEmu (with either Issue 2 or Issue 3 keyboard selected) so I ... whether this is a Fuse issue or something else. I will ... -
X=Y=ZFirst public outing of X=Y=Z for the 48K Spectrum, a 4-level demo which can be download from: [as TZX] [URL="http://www.bobs-stuff.co.uk/extras/xyzd…
... .0) (tried with both the "Issue 2 Keyboard" setting ticked and ... in SpecEmu (with either Issue 2 or Issue 3 keyboard selected) so I ... whether this is a Fuse issue or something else. I will ... sort of subtle timing issue, or floating bus issue maybe?[/QUOTE]
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…
... , the -6 was used in Issue 3 boards, so what was the ... got it running in my Issue 3 48K here, but it's ... wrong. I suspect a timing issue, perhaps what they fixed in ...ZX 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 …
... /Technical/Hardware/ZXSpectrumIssue3-Layout.php"]issue 3 here[/URL]
This ...ZX 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 …
... thinking that you had a issue 3 board, when in fact you ... have an issue 3B board.
The ...ZX 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 …
Wait a second, my board reads @1983 ISSUE 3B but the schematic matching it belongs to ISSUE 3...:confused:
So, -5v should be measured after D12, right?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…
... issues running it on an Issue 4 board, I think they ... play nicely with even an Issue 3... I'd recommend using a ...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…
... 6C001E chips, because in my Issue 2 it gives a good ... [i]not[/i] like my Issue 3 (not 3B) - if I try ... section.
Running my 16K Issue 2 with a Cheetah 32K ... at the end of the Issue 2's life? Has anyone ...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…
... [i]not[/i] like my Issue 3 (not 3B)... Running my 16K ... Issue 2 with a Cheetah 32K ... at the end of the Issue 2's life?[/quote]
issue 2 but not your issue 3, and providing you're sure the issue 3 ... short run prior to the issue 3's release.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…
... any other issues in this Issue 3, and the -6 and -7 ... it's a perfectly normal Issue 3.
Has anyone ever ... they were made for the Issue 3s and found incompatible, it ... , what happened to -1, -2, -3 and -4...? Maybe the -5 ...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…
... 8324. Another site lists an issue 3 with a 6C001E-6 datecode ... spectrum serialnumber database lists an issue 2 spectrum with a 6C001E ...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…
... production. I have a 5C112E-3 here with 8314 datecode that ... made until 8324 when the Issue 3 first came out, and they ...Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... to crack on with the Issue One again.
Following ... other news, I resurrected an Issue 3 from the dead today... CPU ...Replacing Rubber Key Membrane 48k - IssueHi, I've replaced the membrane on my 48k rubbber keyboard. When I have the top and bottom loose, but wired up , all keys work fine. When I place t…
... worked - although yours is an issue 3 motherboard - it should have a ...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…
... think it was a yield issue on the -5, more the ... didn't work with Issue 3 machines. After all, Issue 3 prototypes will have ... , so you would still get Issue 2 machines with the new ...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…
... or -5) was made for Issue 3 boards.
...
Sinclair made the Issue 3 board when they had a ... well under way when Issue 3 boards were made. The ... tweaks in the Issue 3 video circuit are the ... other major tweak in Issue 3 is the position of ...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…
... ULAs as well as the Issue 3 board.
In other words ... a 6C001E ULA in an Issue 2 board, it's [i ... the 5C112, and the 5C112E-3 is better than the -2 ... is better than the 5C112E-3...
So many questions ...5v reg replacementHi all, Have been playing with one of my Issue 2 Spectrums and decided to replace the 5v regulator & heatsink with this wee switching reg I had lyin…
Yes, I think I have one of those SR10S05's lying around also.......muct give it a go on one of my Issue 3's.
Thanks for heads up.
Ian.ZX81 1981 "ISS 3" Motherboard??I took my ZX81 apart today never seen inside one before so had a look and saw a mainboard I've never seen here or online before? [IMG]http://s13.pos…
... common, green solder mask)
- Issue 3, your board (CAD layout, sold ... red solder mask)
Issue 2 boards have not been ... , although there is a USA Issue 1 which has the same ... basic layout as the UK Issue 1 but with CAD laid ...ZX81 1981 "ISS 3" Motherboard??I took my ZX81 apart today never seen inside one before so had a look and saw a mainboard I've never seen here or online before? [IMG]http://s13.pos…
Issue 3 boards tend to have the 2C210E ULA, which has a better (but still not great) chance of working with more modern TV's.
BIntroduce yourself[SIZE=3][FONT=Comic Sans MS]This is the thread to stop by & introduce yourself.[/FONT][/SIZE]
... working order. One Issue 3 fully working 48K, one Issue 2 48K working ... as 16K and one Issue 4B with a fault in ... to keep me busy. That Issue 2 board has had a ...ZX81 + 16k RAM Pack + Original PSU... What's it worth?Hey guys Got my ZX81 this morning its in excellent condition.. [IMG]http://s30.postimg.org/iwetzxku9/IMG_20140818_142443.jpg[/IMG] However, my T…
... with a VHS. Got an issue 3 and 1 ZX81. Still getting ... a cursor.
The issue 1 has all chips in ... at the chips, but for 3 ZX81s to "die" where they ...ZX81 + 16k RAM Pack + Original PSU... What's it worth?Hey guys Got my ZX81 this morning its in excellent condition.. [IMG]http://s30.postimg.org/iwetzxku9/IMG_20140818_142443.jpg[/IMG] However, my T…
... , here you go (on an issue 3):
[IMG]https://farm6 ...ZX81 + 16k RAM Pack + Original PSU... What's it worth?Hey guys Got my ZX81 this morning its in excellent condition.. [IMG]http://s30.postimg.org/iwetzxku9/IMG_20140818_142443.jpg[/IMG] However, my T…
... .
All these are issue 3 with 2C210E ULAs
Issue 1 ZX81 but I'm ...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 …
... D19 (that would be for issue 4B). That would place it ... PCB, as suggested by this (issue 3!) [URL="http://wos.meulie.net ... the cicuit diagram for the issue 4A I found [URL="http ... could not find in the issue 3 PCB layout). :confused:
