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ZX Spectrum limited edition?What's this, in your opinion? [url]http://www.ebay.it/itm/SINCLAIR-ZX-SPECTRUM-48K-Very-rare-/140978416835?pt=Vintage_Apple_Macintosh&hash=item20d2f…
... a standard 48K spectrum. Usually Issue 2/Issue 3.
Look [URL ... -
48K loudspeaker questionsI wonder if someone would know what "40 ohm T.V. type" means? This is the description of the 48K loudspeaker given in the service manual. I?d also li…
A speaker designed to fit headphones with a impedance of 32 ohms may work.
I believe that this has been successful on a issue 3 or above board.
[I][B]Mark[/B][/I] -
+2 issue oneI can't remember seeing this model board before, so here we go: [IMG]http://benophetinternet.nl/hobby/vanmezelf/20130605_153957.jpg[/IMG] [IMG]http…
On the +2A/+3, +2B, and +3B boards the issue number is the ... would come after the Z70500 Issue 3.
Of course it ... -
+2 issue oneI can't remember seeing this model board before, so here we go: [IMG]http://benophetinternet.nl/hobby/vanmezelf/20130605_153957.jpg[/IMG] [IMG]http…
I have UK issue 3 with very low serial number and it is the same as made in Taiwan. However I have never seen Taiwan issue 1.
I think board number 70700 says it is later model and bugs are in fact fixed. -
Which ULA?Just a quick question, more of interest rather than immediate need... I am thinking ahead about the repair of an Issue 2 board, and also an Issue 6A …
... components by swapping with an Issue 3 board that I know is ... a suspect ULA in my Issue 6a board, which is about ... the 'right' ULA for the issue board, so this is something ... really want to get the Issue 2 up and running, but ... -
Testing a +2I recently picked up a non functioning Spectrum +2 Grey (Issue 3 board?), and am just beginning to go through and see what needs to be done to it. I …
... non functioning Spectrum +2 Grey (Issue 3 board?), and am just beginning ... , ROM function, capacitors
3. Check memory function
a ... -
ZX Interface 1 Odd ProblemI have just upgraded a rubber key ZX Spectrum (issue 3) to a ZX Spectrum+. Oddly, when used with a ZX Interface 1, CAT 1 produces a question mark. T…
... Spectrum?
Does this issue 3 Spectrum use a normal Sinclair ... -
ZX Interface 1 Odd ProblemI have just upgraded a rubber key ZX Spectrum (issue 3) to a ZX Spectrum+. Oddly, when used with a ZX Interface 1, CAT 1 produces a question mark. T…
... 't remember having seen an issue 3 board in a long time ... is unusual to have all 3 major chips socketed - the Spectrum ... -
ZX Interface 1 Odd ProblemI have just upgraded a rubber key ZX Spectrum (issue 3) to a ZX Spectrum+. Oddly, when used with a ZX Interface 1, CAT 1 produces a question mark. T…
... - it's an Issue 2 Spectrum, not an Issue 3. And therein lies ... up correctly, using my other Issue 2 as a comparison.
Issue 2 and notice that one ... -
New CPU and Spectranet oddity.I have no reason to suspect this problem is due to a fault/poor design of the Spectranet, but understanding what it does at system initialisation may…
... in (a 128K +3 and a rubber key Issue 4, the CMOS ... 2012).
The other issue with the edge connector CLK ... side. Since the CPLD is 3.3v it meets the Vin ... . I don't have an Issue 3 though, and I may just ... -
New CPU and Spectranet oddity.I have no reason to suspect this problem is due to a fault/poor design of the Spectranet, but understanding what it does at system initialisation may…
... other Spectrums (though not an issue 3) that have modern Z80s and ... />
Back to the problematic issue 3 Spectrum and with the good ... difference. I note that this issue 3 had been butchered in a ... -
+2 issue oneI can't remember seeing this model board before, so here we go: [IMG]http://benophetinternet.nl/hobby/vanmezelf/20130605_153957.jpg[/IMG] [IMG]http…
... -043054 made in Taiwan Z70500 Issue 3 that I have open at ... the date codes, my Z70500 Issue 3 has earlier dated chips than ... /> Also interesting that the Z70700 Issue 1 silk screen is printed ... -
Issue 4A issuesHi all, I've been trying to get the Issue 4A board that came DOA with the case I purchased for my Frankenspectrum to work. I've recapped and socket…
... reswap the ULA from my Issue 3, and guess what.. IT'S ... the ULA over to the Issue 3 board.
So the ... -
A quick ZX Spectrum + restorationI bought a ZX Spectrum + the other day it was untested and in a state didnt cost me much and i had it today only to find the real state. Key 3 was al…
... /> I've come across an issue 3 board which has obviously been ... -
TR1 and TR2 replacementCan anyone tell me the correct replacement part for these? This is for an Issue 4S btw
On all Issue 3 and 4A boards, I found that TR1 and TR2 face each other, means "round" side faces "round" side resp. the sides with the names on. -
Issue 4A repair attemptI think I need some help. I have a nice Issue 4A main board here, which does not give out any video signal. I checked some voltages (the ones that se…
... help, but I had an Issue 3 board some time ago, which ... -
A new site for an old projectThe 'Interface 1bis' project site has been moved to: [url]https://sites.google.com/site/interface1bis/[/url] In fact, it's not only a simple relocati…
... to work with an Issue 3 48k, and an Issue 4a 48k+, and ... -
Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …
... .
Even on later issue Spectrums (which have the heatsink ... , I left my Spectrum (a issue 3 IIRC) on for many, many ... -
Serious SpectrumHas anyone here used their Spectrum for anything other than gaming and programming back in the eighties? I see all these business and productivity ap…
... years and it was a Issue 3 motherboard. I will take some ... -
ULAs interchangeable across issuesHi all, Now that I'm retired, I'm looking again at 8 bit computing :) I'm attempting to revive a spectrum 48K. I'm going to swap chips in/out from…
Chris Smith's book has a whole chapter on ULA versions.
According to the book the transistor modification was still required on the issue 3 ULA and there were some resistor changes on the PCB for the new ULA. -
ULAs interchangeable across issuesHi all, Now that I'm retired, I'm looking again at 8 bit computing :) I'm attempting to revive a spectrum 48K. I'm going to swap chips in/out from…
... board on the issue 3 board onwards, so an issue 2 board requires ... -
No sound from speaker.Help! My trusty 48k has stopped giving me sound out of the speaker. It does however give me sound from the EAR socket. I've tried swapping the spea…
Assuming issue 3 or above:
test the transistor TR7 - ZTX 450
It's ok to replace with a ZTX 650 ;) If that fails, the speaker is probably toast. -
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…
Hope I'm doing this right.
48K Issue 3
Serial (green): 001-564512
CPU SGS Z80A 28423
ULA 6C001E-6 8340 -
Possible dodgy +2 - resets when loadingSo I have a grey model +2 with a recently refurbed tape deck (new belts and cleaned heads). It might be a product of bad loading, but from what I ca…
Wanted: broken motherboard!Does anyone have a motherboard for a 48k (any issue) that is currently not working? I'm looking to set up a test board for chips, and would like to g…
... motherboard for a 48k (any issue) that is currently not working ... ).
I use a 48K issue 3 board for 4116 chip testing ...48k of my youthSooo, So I finnaly had a few minutes to spent around in the 48k. I opened the box for a quick inspection, mainly to check on the version and to see…
... /> It seems to be a Issue 3 (anyone care to confirm it ... think it says "(c) 1983 Issue 4", but I can't ...48k of my youthSooo, So I finnaly had a few minutes to spent around in the 48k. I opened the box for a quick inspection, mainly to check on the version and to see…
... think it says "(c) 1983 Issue 4", but I can't ... , it's a Issue 4B. The difference to Issue 3 seems to be ...Push 'n' ChaseIt is my great pleasure and honor to announce the release of PUSH 'n' CHASE a game made with CGD featuring a wonderful loading and intro screen …
... my newly found zx Spectrum (issue 3) but i would bve thrilled ...Understanding DRAMI think I am going slightly mad. My hardware knowledge has got more rusty than it should have done, and I am going to have to turn to the experts to…
... and OKI RAM supported in issue 3 and later Spectrums. The RAM ...Sinclair Serial Numbers - What have we learnt so far.So JakeyW has been collecting our serial numbers for a while now. What are we learning from this that we did not know before hand? Also, would it n…
005- is probably issue 3 - you can find out by ... see the heatsink it's issue 3 or later.
Are ...
