-
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 -
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 ... -
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…
... this right.
48K Issue 3
Serial (green): 001-564512 ... -
Issue 3 board with strange piggy-back boardIn case you are interested. I?ve never seen something like this before. I have an Issue 3 board here. When I opened the case and found a strange pig…
Mate, we all know what a Spectrum issue 3 board looks like.
We need the underside (or bottom side if you prefer) of the Logitek board!
And since you're at it, a better close-up of the top side wouldn't hurt... -
I've had better nights...So I got a broken issue 2 today, case in good nick but the diags board showing multiple failures in both lower/upper RAM. Never mind, good as a spare…
... luck today and repair one issue 3 for ten minutes :), I have ... check of voltages get me +3.5v on lower ram, change ... -
Spectrum Missing -5vMy Spectrum is "almost" booting, just when you expect the (C) 1982 Sinclair Research to appear it just displays flashing squares on the screen :( I …
... original rubber key 48k Spectrum issue 3
Any help or ... /dried C46. Just resurrected an issue 2 with exactly the same ... -
Video failureHi i cant find the failure of my spectrum 48k issue 4a, i thought it was ic6 or ic13 but the memory seem to have the right values. When i turn it on…
I just had a case recently where an Issue 3 showed the lower half of the screen only, but twice ?!? Finally replacing the ULA fixed the problem. -
Two more faulty onesCould I get your opinion on these two faults, please? Understanding these two cases would be very beneficial for my ZX education. Thanks! - A Spectr…
... had been applied to the issue 2 5C112E ULA and altered ... ]Chapter 24. ULA Versions, section "Issue 3 ULA 6C001E-6", p.251 ... /> [/RIGHT]
[/QUOTE]So any issue 3 machine and up will exhibit ... this shift compared with issue 1/2 Spectrums.
"Press any key" detectionWhat would be the simplest way to detect if *any* key is being pressed? No LAST_K trickery, I can't rely on that. It has to be reading the keyboard p…
[QUOTE=aowen;735032]The Timexen return 95 on IN 254 when no key is pressed. Not sure what issue 2 machines do.[/QUOTE]
I'm getting 31 on my TS2068s.
The issue 2 returns 255, the issue 3 returns 191.Spectrum 48k membraines & key metal cover :)As per title, what the best place to get these from ? I need 2 of each for the rubber keyed speccy :) Thanks OttO
... couple of my newly-refurbed Issue 2:
[IMG]http ... ]
I've an Issue 3 that I got a couple ...FS Very early serial ZX81Sorry in advance if I have put this in the wrong section, please move if wrong! [URL="http://www.ebay.co.uk/itm/111235944876"]ZX81[/URL]
... number, and I have issue 1 and issue 3 boards, and one of ... my issue one boards has a ...FS Very early serial ZX81Sorry in advance if I have put this in the wrong section, please move if wrong! [URL="http://www.ebay.co.uk/itm/111235944876"]ZX81[/URL]
... an issue 1, then an issue 3 no serial followed by an issue 1 ...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…
... (Green)
ULA 5C112E-3 8316
Issue 3
D01-191360 ... (Green)
ULA 6C001E-6
Issue ... )
ULA 5C112E-3 8319
Issue 3B
D01-366989 ...Born again Speccy user with problemsHello all, Firstly I'd like to say a big hello - this is my first post! When I was 8 or 9 or so my dad bought a ZX Spectrum 48K and a whole bunch o…
... speaker whilst saving.
Issue 4B board in an '83 ... tbh - I'd expect an issue 2 or an early issue 3 boardBorn again Speccy user with problemsHello all, Firstly I'd like to say a big hello - this is my first post! When I was 8 or 9 or so my dad bought a ZX Spectrum 48K and a whole bunch o…
... headphones...
[QUOTE=DEATH]Issue 4B board in an '83 ... 'd expect an issue 2 or an early issue 3 board [/QUOTE]
Two spectrums?I'm trying to find out more about these two Spectrum? The serial number on the first is worn. I found these pictures on the web and that's all I ha…
... [/URL] they're both probably issue 3 boards (second may be a ...+2 Grey video issueSo far ive replaced TR4, TR5 (and correctly orientated them) and seperated the audio from the video, still I have this; [youtube]mZZWOXRs_Zk[/youtube…
Cheers B! Exactly what I needed! Its a 70500 Issue 3 board btw, just for reference, time to order some BC547's then if the BC548's wont work (or will they?)Horace MinerNew Horace game for 2014 [url]http://stevebroad.x10.bz/spectrum/download/HoraceMiner.zip[/url]
... to switch the keyboard to issue 3 under options i Spectaculator.
Spectrum+ Issue 3b customization and repairHi everybody, I've got a Spectrum+ that shows exausted electrolytics capacitors issues such as poor colors on the screen and speaker noises. I was go…
... the voltage conversion circuit on Issue 3 machines (you'll see two ...48k+ ULA'sI've got three ULA's here that only work in certain boards. Thought I was going nuts, swapping, changing stuff around. But hey, I've got two working …
... ULA, found on Issue 1 and early Issue 2 boards. ... internally, however a further issue concerning I/O to ... in machines containing this ULA (Issue 2 boards).
[*] ... TV makes. Found on Issue 3 boards, spider mod was ... of RAM. Found on Issue 4A and above boards.< ...48k + Issue 3B Power SocketHi All, Trying to get a Issue 3b resurrected that had a faulty power socket. The socket has come away from the board and peeled away some of the tra…
Thought so, but wanted confirmation. One the Issue 3, it tracks back to the underside of the board but the issue 3b is different.
Ta for confirming. :)
