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Spectrum Composite video connections?Is it possible to modify a standard 48K spectrum to give composite video output? In my experience i have found the quality of the picture out of the…
... case, this could mean faulty ULA chip (ferranti socketed chip, IC1 ... board since there's some ULA timing issue that was (apparently) never ... and not bother replacing the ULA, which you'll only get ... -
Spectrum Composite video connections?Is it possible to modify a standard 48K spectrum to give composite video output? In my experience i have found the quality of the picture out of the…
Those fade vertical bars are normal. All my spectrums have them.
Also normal is the slightly moved to the left paper (a known ULA issue, modeulator has nothing to do with it , later fixed on the 128 models). -
48k one dead, one dodgyhello everyone. I have 2 48k spectrum +'s (the one with the QL case). Both boards have issue 3B on them near the speaker. The first will power up …
... ).
Both boards have issue 3B on them near the ... ) or the pair near the ULA (BC184). Equivalents of these transistors ... -
48k one dead, one dodgyhello everyone. I have 2 48k spectrum +'s (the one with the QL case). Both boards have issue 3B on them near the speaker. The first will power up …
... . Its LM1889N
The ULA is on a socket
issue)
Only has the ULA on a ... -
Spectrum Issue two problemI managed to bring back to life a issue two spectrum (at least the power supply cirquit). The screen is now crystal clear (after replacing all the el…
... left of the ULA).
I now have an Issue two spectrum ... -
problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
... and +12, IIRC). Anyway, my issue 6A clone has more modern ... have another working issue 6A board, try a ULA swap next.
problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
... /> 8520
is ula from not working sinclair
8412
is ula from working sinclair
< ... br /> I insert ula from not working to working ...
I insert working ula to bad sinlair and no ... ula6c001e-6 ? 6 coming from issue 3b
...problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
[QUOTE=gorski]
are there differences between ula6c001e-7 and ula6c001e-6 ? 6 coming from issue 3b ?
i[/QUOTE]
Any ULA is good. Differences are irrelevant here.
Very likely CPU is dead.problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
... sinclair zx spectrum issue 3b
I insert ula from not working ... ]
I back original ula (ula6c001e-6) and sinclair work ... a bad feelings about this ula :(
tomorrow I try ...problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…
... br /> 8412
is ula from working sinclair
< ... br /> I insert ula from not working to working ... -6 ? 6 coming from issue 3b
if i ... chip sitting between the real ULA and the CPU (IC27 ... between the CPU and the ULA, intercepting address lines and ...Blowtorch method of Speccy repairsI just did my first Spectrum repair (and successful at that). It was the Issue 2 spectrum I wrote about a while ago, I just hadn't got around to doin…
... performs tests on keyboard, sound, ULA, RAM chips, and ROM mostly ... />
btw, i repaired an issue two myself lately. Had multiple ...Low speaker volume on a repaired issue two speccyI repaired an issue two speccy which was totally wrecked and missing many parts. I installed the missing parts (resistors, transistors) and replaced …
... according to the modification for issue two pcb (for better cirquit ... feeble signal that the ULA alone provides. Issue 3+ has a ZTX450 ... to amplify the ULA output to ... the circuit diagram of an issue 3+. My normal disclaimer ...Issue two picture qualityDoes anyone know if issue two and earlier spectrums have worse picture quality (in general, beside colours) compared to issue 3 and later? I mean on…
... ]Does anyone know if issue two and earlier spectrums ... , beside colours) compared to issue 3 and later?
... /> I mean on both issue two speccys that i have ... normal for this early issue. Also i want to ... ULA, try a ULA chip from a higher issue board - the ULA ...Sam Revival magazine issue 16 now out! [Sam CoupIssue 16 of Sam Revival magazine is now out! This issue features the full Sam game 'Colony' on the coverdisk, which was written by Derek Koselo. Col…
... with personality from graphics and ULA/ASIC? Sorry for random question ... machine code proglet on an issue of FRED that was like ...Sam Revival magazine issue 16 now out! [Sam CoupIssue 16 of Sam Revival magazine is now out! This issue features the full Sam game 'Colony' on the coverdisk, which was written by Derek Koselo. Col…
... with personality from graphics and ULA/ASIC? Sorry for random question ... letters pages that started in issue 13 have gone down very ... say in each and every issue!
I'm also ...Did I killed my Speccy ???Hi guys, 1 minute ago I was working on my 128 +2A... But I made a mistake : I cut the gound on the PSU plug of the computer, and I forgot to resolde…
... you've taken out the ULA chip too, in which case ... a replacement part for that ULA and you certainly won't ... to the PCB, and the Issue 2 board survived unmarked.
ULA off there's the problem ...Audio input on a +2would it be possible to connect an external tape recorder to the socket at the back,or would something bad happen?
... you have a ground loop issue caused by your tape deck ... ) onto a pin on the ULA that was NOT supposed to ...Audio input on a +2would it be possible to connect an external tape recorder to the socket at the back,or would something bad happen?
... and attenuate any transients. The ULA pin 28 labeled 'MIC/ ... and MIC ports on the ULA side of the DC ... port comes off the same ULA pin, except as well ... .
On the issue of +2 fried ULAs, the ... comes *directly* from the ULA with no form of protection ...Audio input on a +2would it be possible to connect an external tape recorder to the socket at the back,or would something bad happen?
... ) onto a pin on the ULA that was NOT supposed to ... you have a ground loop issue caused by your tape deck ...Audio input on a +2would it be possible to connect an external tape recorder to the socket at the back,or would something bad happen?
... circuit") as to why the ULA in the Spectrum got destroyed ... you have a ground loop issue caused by your tape deck ... ) onto a pin on the ULA that was NOT supposed to ...toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…
... at the schematics for an Issue 2 suggests that the power ...What's the most probable......cause for this on a grey +2? (z80 is excluded) [url]http://img376.imageshack.us/img376/8087/plus2hk9.jpg[/url]
... that, what should be next? ULA? PCF1306P...?[/QUOTE]
The ... , shoved into a single chip. Issue 6 48K boards as well ... ZX84 standard cell.
ULA - only sure source is a ...Whats up wi mi speccy ? M RAMTOP no good 0:3I bought a speccy on ebay tried to load Mission Impossible but about 30 secs into loading it stopped and i got the error message ... M RAMTOP no good…
... get 32600 but its an issue 4a !!!!! guess i'll have ... /> No such thing as an issue 4a 16K machine - unless it ... chip is completely shagged, bad ULA - the list goes on, but ...Dead +2B, help required...It was bought defective on ebay. It came with two faults: a "dead" power supply (it was the fuse) and a faulty main unit. The power supply is now re…
... than the others, and the ULA get noticeably hotter (although I ... , made in taiwan, board Z70833 issue 1. I'm trying to ... possible failure before getting the "ULA dead" death sentence.Dead +2B, help required...It was bought defective on ebay. It came with two faults: a "dead" power supply (it was the fuse) and a faulty main unit. The power supply is now re…
... , made in taiwan, board Z70833 issue 1. I'm trying to ... possible failure before getting the "ULA dead" death sentence.[/QUOTE]
ISSUE 1 AMSTRAD is all over ...On a 48K issue 6A......how can i isolate the 32K block? I want to test if there is any fault on the 4116's , leaving the 4532's out of the equation. Will removing the …
... i tested this on another issue 6.
By swapping ... exclude rom, the 4116's , ula, pcf, and z80.
On a 48K issue 6A......how can i isolate the 32K block? I want to test if there is any fault on the 4116's , leaving the 4532's out of the equation. Will removing the …
... entire bus back to the ULA and CPU and supporting logic ... doing the same on an issue 4 board lying around waiting ...Faulty M1 linesI'm sure this has been discussed before, but using the forum search for the word 'M1' pulled back no hits, which surprised the hell out of me. Anywa…
... signal is fed to the ULA (further gated by an [B ... is in Issue 6A. This allows you to disable ULA's I ...GrrrThere's nothing more annoying than finding out that you've managed to bridge /RAS and A3 on the bank of 4116s while putting in sockets. Naturally, th…
... ULA - that's been consistently in a socket at least to Issue ...Spectrum 48K ROMHi Can anybody help I have an Issue 6a Circuit Board which has a faulty ROM Chip. Is it possible to program a ROM Chip with the 48K ROM and fit it as…
... a) RAM refresh
b) ULA bus mastering
But I ... linked to CASL in the ULA, while Out C is ... to RASL in the ULA and A6 in the ... your config CASL in the ULA is linked directly to ... Issue 5, but Issue 4 and earlier issues have different connections. ULA ...
