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16pf Capcitors for C72/C73 issue 3b. Can I use 18pf?Looking at the service manual it states to use a 16pf ceramic disc capacitor in positions C72 and C73 on issue 3b boards. Is this very critical in bo…
... build up one of these redrawn boards. Luckily I have a ... the passive components for my redrawn 3b build. So far I have ... -
Issue 3B problemHi! I have an issue 3B board that is having a strange problem: when I got it it didn't had the -5V and +12v, as usual. After replacing TR4 and TR5 t…
... />
I have an issue 3B board that is having a ... -
ZX Spectrum +2b and +3b modelsI've been wondering for quite a while what the +2b and +3b were all about, as neither appear in the FAQ, but we have a service manual in the archive …
... while what the +2b and +3b were all about, as neither ... -
48 Issue 3b working but very hot ula and cpuSalve to everybody I bought from e*ay an Issue 3b 48k , fitted in a + case. Fixed the keyboard problem with a new keyboard membrane from good Rwap (w…
... from e*ay an Issue 3b 48k , fitted in a + case ... -
+2A/+2B/+3/+3B researchdoing my redrawing/correcting of the +3 schematic I'm uncovering lots of oddities in the service manuals. I am trying to work out what really exists…
... , as found in the "+2B/+3B" diagram of the +3 amendment ... -
ZX Spectrum 48k issue 3b power problem?Hi :) I was lucky enough to find a couple of ZX Spectrums at a car boot sale yesterday. I spent the evening fiddling about with one (issue 2) and t…
... /> The second is an issue 3b. I am willing to fiddle ... -
Issue 3B(S)?Got an Issue 3B rubber in today, all boxed up but a sticker on it that states it was made in Korea, hmm, 4S then I think, till I opened it up. Same …
Got an Issue 3B rubber in today, all boxed up but a sticker on it that states it was made in Korea, hmm, 4S then I think, till I opened it up. Same colour board as a 4S but its a 3B, first one like this ive ever come across -
Is the +3b a myth or just rare?I have a few speccies, one of them being a +3 with terrible sound (terrible that is, until I did a minor mod to replace some resistors, now the sound…
... the interweb about a Spectrum +3b which was made in China ... (and from my understanding, not +3b's). I have never seen ... a +3b or a picture of one ... , or does a non distorted +3b made in China actually exist ... -
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…
... /> Trying to get a Issue 3b resurrected that had a faulty ... -
Issue 3B no soundI just noticed that there's no sound in the Issue 3B Speccy that I've been fixing. Is it more likely that the speaker is bust or is it TR7 and D9? …
I just noticed that there's no sound in the Issue 3B Speccy that I've been fixing.
Is it more likely that the speaker is bust or is it TR7 and D9? Or both? -
How to tell a Spectrum +3BAnyone know if there's a way to tell externally (from the case) if a +3 is a +3B? I know about the typing 'Spectrum' once in basic. How rare are th…
Anyone know if there's a way to tell externally (from the case) if a +3 is a +3B?
I know about the typing 'Spectrum' once in basic.
How rare are these Speccys, I know they came later on but anyone know how many were produced? -
Three Spectrum main boards (Issue Two, 3B and 4A)I will be offering three partially tested Spectrum main boards (Issue Two, 3B and 4A) on Ebay. All boot to the Sinclair (C) message. All fully popula…
... Spectrum main boards (Issue Two, 3B and 4A) on Ebay. All ... -
Issue 3 /3b power rail improvements<!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:AllowPNG/> </o:OfficeDocumentSettings> </xml><![endif]--> <p class="MsoNormal">Hi F…
ULA 1E7 in 3B board?Hi all. Any comments on the following would be appreciated. I have an issue 4a and an issue 3b Spectrum. While having a look around inside the 3b …
... issue 4a and an issue 3b Spectrum. While having a ... look around inside the 3b I noticed it contains ... the 7 ULA, whereas the 3b should have E6. So ... the later stages of the 3b manufacturing before making their ... models, and so my 3b may be worth a repair ...Issue 3B woesHello there, I currently have a Issue 3B for repairs around, it used to have broken upper and lower RAM, which I replaced with 41256-120 DRAMs (hac…
... /> I currently have a Issue 3B for repairs around,
it ...48K Issue 3B ROM to EPROM methodsHi folks, While fixing up a completely dead Commodore PET I needed a way of testing the 4116 RAM chips that make up its 32K, some googling found a…
... to have such a board (3B that the previous owner had ...Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…
... 've been donated an issue 3b which has some nice black ...Issue 3B turning offI'm trying to save a Spectrum Issue 3B. I restored the power supply section, changing the 7805, TR4, and TR5, besides all electrolytic capacitors. No…
... to save a Spectrum Issue 3B. I restored the power supply ...16pf Capcitors for C72/C73 issue 3b. Can I use 18pf?Looking at the service manual it states to use a 16pf ceramic disc capacitor in positions C72 and C73 on issue 3b boards. Is this very critical in bo…
... C72 and C73 on issue 3b boards. Is this very critical ...Building a ZX Spectrum 3B, Looking for PartsAs the title says, I'm attempting to build a new ZX Spectrum, but I'm having some trouble locating all of the parts. Thus far, I've got all of t…
... when compared to my original 3B board that I've been ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... , #D8, #1F
db #DC, #3B, #CE, #73, #C7, #E3, #C3 ... , #C6, #E3, #CE, #73, #DC, #3B
db #D8, #1F, #D0 ... /> db #01, #80, #0F, #F0, #3B, #DC, #33, #CC
db ... exit also needs to get redrawn if the player moves over ...Wanted:Installation Tape/File for Disciple Interface (ZX Spectrum)Need to rescusitate my Disciple Interface. The last time I worked with it - I fitted it with a new chip - that uses DOS version after 3b. That was …
Yet Another Speccy Quiz (not too hard)OK! I thought I'd chance my arm at one of these things. I must say I've found the recent quizzes WAY too difficult, so I've pitched this one at simpl…
... this odd behaviour?
3b. ...and what instrument does the ...Spectrum+ keyboard problemHello all! I was wondering if someone here could give me some hints with my Speccy+. The problem is that I replaced the motherboard of my Spectrum+ …
... + (the new one is issue 3B) and now the "STOP"-key ...Four faulty 48k Rubber Keyed Spectrums for SaleOkay, I've finally dug them out and decided to offer them on here, as when I mentioned them once before some people showed an interest. The circuit …
Advice about drawing sprites on spectrum I've coded sprite drawing before and know all the theory about masks from a long time ago (microhobby rules! ;), but since I did it on Amiga with ha…
... . Have "preshifted" sprites.
3b. AND + OR from preshifted sprites ...

