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New user with a dead 48k issue 2Hello all I've found my way here from watching some excellent youtube videos by Joulesper Coulomb in an attempt to fix a issue 2 rubber key 48k I bo…
... ROM are okay, and the ULA is at least partly working ... it).
[B][I]Mark[/I][/B] -
ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
Well apart from the ULA, everything can be renewed, ... part fitted. If the ULA is toast or over half ... plans afoot to solve the ULA spares problem, some used ... but good ULA's are sometimes available). Meanwhile ... .
[B][I]Mark[/I][/B] -
Question for ZX81 GurusI have an ISSUE 1 ZX81 with a 2C184E ULA. If I ever need to change it, can I use one of the newer 2C210E ULAs? If I can, are there any other mods th…
... is fitted with a 2C184 ULA, the next thing to try ... , is the improved 2C210E ULA. Or to get one of ... if you have a 2C210E ULA, using one of these modules ... helps ;-)
[I][B]Mark[/B][/I] -
Question for ZX81 GurusI have an ISSUE 1 ZX81 with a 2C184E ULA. If I ever need to change it, can I use one of the newer 2C210E ULAs? If I can, are there any other mods th…
Thanks for the explanation Mark, understanding the technical side ... 2 with the 210 ULA and one with the ... was primarily can the ULA be upgraded OK with ... problems with the board - dead ULA, ROM or Memory - I ... Z80. Using a 210 ULA replaces a faulty 184 leaving ... -
RAM issue for potential 48k buy?Hi guys I've got a 48k in my sight for ?20 but... it has an issue: [QUOTE]"I tested the computer and only displayed a distorted screen. Coloured …
... easily replaced is the ULA).
[B][I]Mark[/I][/B] -
Ben Heck modifies a Zee X Spectrum.Gahh, one of the differences between Americans and Europeans right there in the title. Anyway, we know better ;) ...and this isn't about that anyway.…
... is a Z80 CPU, a ULA, a ROM or EPROM containing ... used.
[B][I]Mark[/I][/B]
* I ... -
Ben Heck modifies a Zee X Spectrum.Gahh, one of the differences between Americans and Europeans right there in the title. Anyway, we know better ;) ...and this isn't about that anyway.…
... in my earlier post, after "ULA" add: and for the Amstrad ... Amstrad.
[B][I]Mark[/I][/B] -
ZX81 ULA questionRecently, I got a nice bundle of kit comprising of a ZX81, Memotech keyboard, PSU and brand new 16K Sinclair Memory pack. The ZX81 has a ULA with no…
Is the ULA socketed? There might be more ... it could be a 2C158E ULA, which would have been the ... logic IC's? That would mark it out as one of ... -
ZX81 ULA questionRecently, I got a nice bundle of kit comprising of a ZX81, Memotech keyboard, PSU and brand new 16K Sinclair Memory pack. The ZX81 has a ULA with no…
... early ZX81's have the ULA soldered in. Not many have ... you.
[I][B]Mark[/B][/I] -
ZX81 ULA questionRecently, I got a nice bundle of kit comprising of a ZX81, Memotech keyboard, PSU and brand new 16K Sinclair Memory pack. The ZX81 has a ULA with no…
... wishing to disagree too much Mark as I respect your knowledge ... socketed for the ROM, CPU ,ULA(excluding internal ram of course ... /> Would also agree that the ULA shown(Pics seem to have ... I have a later working ULA which I would be happy ... -
Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…
Hmm...
Unless the ULA has a fault with it' ... 't see how a different ULA would make any difference to ... noise.
[B][I]Mark[/I][/B] -
Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…
... games interesting.
The ULA is actually socketed. Is it ... display.
[I][B]Mark[/B][/I] -
Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…
... addressing/contention of the ULA. Now depending on how ... connects to the ULA (normally the ULA pins are lifted ... depends on how the later ULA is fitted. If the ... let the later version ULA pins fit into the ... ULA do not short to anything.
[I][B]Mark ... -
Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…
... br />
[I][B]Mark[/B][/I][/QUOTE]
ULA. I didn't disconnect ... just left the old ULA floating on its back attached ... Dropped in the other ULA and I have exactly ... Interestingly I stumbled upon a ULA for the ZX81 on ... -
Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…
... separate signal direct from the ULA. It only carries the monochrome ... can pick it up at ULA pin 17, the "Y" link ... is is direct from the ULA, it should be buffered by ... back.
[I][B]Mark[/B][/I] -
Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…
... ]Interestingly I stumbled upon a ULA for the ZX81 on eBay ... culprit.[/QUOTE]The early ZX81 ULA chips don't include part ... your fault. The early ZX81 ULA chips work fine with B ... TVs.
[I][B]Mark[/B][/I] -
48k Spectrum "Jail Bars" Removal?Hi all Just curious I think I saw a post here about the bars that go down the screen on some 48k's I think he referred to them as "jail bars". Any…
... by the design in the ULA. But some can be reduced ... zzzzz).
[I][B]Mark[/B][/I] -
Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…
... separate signal direct from the ULA. It only carries the monochrome ... can pick it up at ULA pin 17, the "Y" link ... is is direct from the ULA, it should be buffered by ... back.
[I][B]Mark[/B][/I][/QUOTE]
Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…
... ;790308]The early ZX81 ULA chips don't include part ... fault. The early ZX81 ULA chips work fine with B ... doesn't like would you Mark, because in thirty odd ... colour TV that the later ULA wouldn't play ball ... with the issue three (later ULA board) and colour sets.< ...Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…
... doesn't like would you Mark, because in thirty odd ... TV that the later ULA wouldn't play ball ... the issue three (later ULA board) and colour sets ... ]anything[/I] about the later ULA...
The ... ZX81 machines regardless of which ULA is fitted.
Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…
... ] circuit (keep in mind the ULA pin reference shown on the ... help to show that the ULA is most likely okay.
[B][I]Mark[/I][/B]Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…
... like yours Mark. So it seems as though the ULA is working ...Hot plugable edge connector?Could the spectrum's edge connector have been made hot plugable without adding much to the manifacturing costs? I was thinking along the lines of a…
... the ULA gets killed as well.
[B][I]Mark[/I ...Issue 4s - Not 'Jailbars' but lines alloverIt's not another 'Jailbars' question!, but I've got this Issue 4S that aside from the 'Jailbars' on the Paper area of the screen which I can live wit…
... Spectrum:
[LIST]
[*]The ULA clock (and the CPU clock ... anyway.
[B][I]Mark[/I][/B]Issue 4s - Not 'Jailbars' but lines alloverIt's not another 'Jailbars' question!, but I've got this Issue 4S that aside from the 'Jailbars' on the Paper area of the screen which I can live wit…
... of noise made inside the ULA.
Try 100nF or ... capacitors between each ULA power pin and the ULA 0V pin (or ... to the ULA pins as possible.
[I][B]Mark[/B ...'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…
... />
Ben has some spare ULA's. You may want to ... :D.
[I][B]Mark[/B][/I]ZX81 and Analogue TVsI recently bought a really nice ZX81 on ebay in amazing condition, but I'm having issues tuning in an old analogue TV to lock onto the signal. I und…
... boards had sockets for the ULA chips.
[ ... are socketed. Sometimes the ULA, the Z80 CPU and ... br /> There are three ULA chips, two types are common ... . Both this ULA and the earlier 2C158E ULA generate a TV ... [/quote]
[b][i]Mark[/i][/b]ZX81 and Analogue TVsI recently bought a really nice ZX81 on ebay in amazing condition, but I'm having issues tuning in an old analogue TV to lock onto the signal. I und…
... of the two early type ULA's (2C158E & 2C184E) work ... with one of the earlier ULA chips. But I do have ... 's with the later 2C210E ULA don't suffer with a ... TV.
[B][I]Mark[/I][/B]Sinclair Today...Based on your experiences and knowledge of how Sinclair Research operated back in the 1980s, if they were to announce a new Sinclair branded PC or La…
... 32k byte). But the video ULA would have been the problem ... better.
[B][I]Mark[/I][/B]'Interesting' Issue 2 modSo I've been lurking on this forum for a while and I've got to the point where I want to see if I can repair a speccy.. so I bought me a 'broken' one…
With no ULA, there is no video signal ... .
With a working ULA, PAL colour encoder chip, working ... , but the data that the ULA reads will either be that ... correctly ;)
[I][B]Mark[/B][/I]
