-
128 port hardware patchReading the ULA book has reminded me of something. In The Spectrum Hardware Manual (Adrian Dickens) there is a hardware patch to allow free use of al…
... actually on the PCB of issue 3 and up, the circuit ... CPU. However, checking Smith: "The issue 2 "spider" modification was still needed ... an integral part of the [issue 3] PCB".
[quote ... -
128 port hardware patchReading the ULA book has reminded me of something. In The Spectrum Hardware Manual (Adrian Dickens) there is a hardware patch to allow free use of al…
... just measured A7 on an issue 2 board I have lying around ... state on A7 as 4.2 volts (in other words, -0 ... gate threshold of around -1.2 volts and will probably just ... -
+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…
... +2A/B circuit boards (ISSUE 1 and ISSUE 2 both number Z70833)
ISSUE 1 and ISSUE 2 circuit boards bear (C ... />
3) Both ISSUE 1 and ISSUE 2 of the +2A/B ... Taiwan and contains a 1987 ISSUE 2 board.
+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…
... /> even if it's an ISSUE 2 board I'd like photos ...+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…
+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…
+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…
... /> I now have photos of ISSUE 1, 2, and 4 of the ... have an example of the ISSUE 3 too if anyone has ... photos of both the ISSUE 1 and ISSUE 2 board from the +3 ... at the possibility of an ISSUE 3, again I'd like ...+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…
... No. U046140
Motherboard Z70833, Issue 1
Last date code ...
Motherboard Z70830, Issue 2
R67=47K, R62=2.2K
Last ...
Motherboard Z70830, Issue 2
R67=47K, R62=2.2K
Last ...+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…
... No. U046140
Motherboard Z70833, Issue 1
Last date code ...
Motherboard Z70830, Issue 2
R67=47K, R62=2.2K
Last ...
Motherboard Z70830, Issue 2
R67=47K, R62=2.2K
Last ...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…
... />
Circuit board: AMSTRAD Z70830 ISSUE 2 (C) 1987
CPU: Z0840004PSC ...zx spectrum ULAis the ULA in the 16K the same as in the 48K could you take the 16K ULA and place it in a 48K I ask this because i have a speccy thats dogy with th…
[QUOTE=The President;482611]Issue 2s had a less serious flaw which was fixed with a transistor mounted on top of the Z80.[/QUOTE]
And the Issue 1 ;-), but no one noticed until the Issue 2 ULA came out.....Can someone identify thisSorry if it's something extremely obvious but this is the first time I've had my hands on a Spectrum in about 20 years (thanks eBay) and although som…
... br /> Happen to own an issue 2 myself, and IIRC it doesn ... guess it's an early issue 2 with older version ULA ... you see on some older issue Spectrums.
... ULA & Z80). Maybe issue 2 needed that extra circuit too ... t remember if my issue 2 had 16 or 48K ...Can someone identify thisSorry if it's something extremely obvious but this is the first time I've had my hands on a Spectrum in about 20 years (thanks eBay) and although som…
... pictures of my upgraded 16k Issue 2. The upgrade is a FOXX ...Teodoro no Sabe VolarIt's out! [URL="http://www.retroworks.es/php/game_en.php?id=6"]Go and grab it![/URL] Comment here on in our blog...
... that won't work on issue 2 keyboards, and looks like it ...Teodoro no Sabe VolarIt's out! [URL="http://www.retroworks.es/php/game_en.php?id=6"]Go and grab it![/URL] Comment here on in our blog...
... that won't work on issue 2 keyboards, and looks like it ...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…
+3
serial number: U114034.
Issue 2 board (Z70830) dated 1987
Date code: 70518Spectrum 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…
48K
001-239802 (green writing)
1982, issue 2 motherboard (SRC 095)
ULA5C112EMute switchOn a standard 48K machine, would it do any harm to fit a mute switch into one of the sounders connections ? I mean by 'harm' switching it on / off w…
... . If your PCB is a issue 3 or later (which uses ... /> If your PCB is a issue 2, then D9 will have 0V ...Faulty +2A questionDug out some Spectrums earlier and amongst them I had +2A's which i've never even bothered to power up. First one powered up no probs, clean picture …
The faulty +2a is an issue 2. My working one is an issue 1 and doesn't have the capacitor.
On the fault, just ruled out the z80 being faulty as it works in the issue 1. Off to do some tests on the rest..Faulty +2A questionDug out some Spectrums earlier and amongst them I had +2A's which i've never even bothered to power up. First one powered up no probs, clean picture …
... ]The faulty +2a is an issue 2. My working one is an ... issue 1 and doesn't have ...Things you wish you'd never let go....The oldest technology thread made me think of Entex Pacman and Tandy Basketball. I love these two handhelds but traded them with friends after a cou…
My original Spectrum collection - Issue 2 48k, 48k+, grey +2, +2a and a LOT ...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…
Spectrum 48k issue 2 motherboard. D01-126028
... I have put in an issue 4s from a Spectrum +.
48k SoundHi All Been here before but still not happy with my 48k sound/beep volume. I seem to recall with my original 48k Spectrum all those years ago that…
... an issue 1 Spectrum (quite rare), you have either an issue 2, or ... a later issue.
Look ... aluminium above, you have an issue 3 or later, and hence ... large piece, you have an issue 2 (or issue 1), and no amplified ...48k SoundHi All Been here before but still not happy with my 48k sound/beep volume. I seem to recall with my original 48k Spectrum all those years ago that…
... an issue 1 Spectrum (quite rare), you have either an issue 2, or ... a later issue.
Look ... aluminium above, you have an issue 3 or later, and hence ... large piece, you have an issue 2 (or issue 1), and no amplified ...48k SoundHi All Been here before but still not happy with my 48k sound/beep volume. I seem to recall with my original 48k Spectrum all those years ago that…
... an issue 1 Spectrum (quite rare), you have either an issue 2, or ... a later issue.
Look ... aluminium above, you have an issue 3 or later, and hence ... large piece, you have an issue 2 (or issue 1), and no amplified ...How to clean up video output to TFT LCD - Spectrum 48kHi, I hope that there is an easy answer to this question. I have modded the RF socket on my 48k Spectrum to output composite video as described in t…
if it's an issue 1 or issue 2 board you might be able ... head. If you have an issue 3 onwards, all the way ...How to clean up video output to TFT LCD - Spectrum 48kHi, I hope that there is an easy answer to this question. I have modded the RF socket on my 48k Spectrum to output composite video as described in t…
... ]if it's an issue 1 or issue 2 board you might be ... head. If you have an issue 3 onwards, all the way ...The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…
... except those which require an issue 2 keyboard. Sure, it might have ... the toastrack 128 and grey +2:
[url]http://www ... the toastrack 128 and grey +2. Most 128 games were written ...The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…
... the case even with an issue 1 board? I don't ... , but somebody else has said issue 1 does have a few ... on the under side, but issue 2 don't. Maybe they forgot ... a few bits on the issue 1.The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…
... the case even with an issue 1 board? I don't ... , but somebody else has said issue 1 does have a few ... on the under side, but issue 2 don't. Maybe they forgot ... a few bits on the issue 1.[/QUOTE]
hmm ... of the underside of an issue 1 board so I couldn ...
