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ZX81 Dark screen, could it be the ULA?Trying to get a ZX81 going for a mate of mine, already replaced the membrane (Cheers Rich!) but now its the old "very dark screen" problem, probably …
... one of those... the regular composite modification doesn't fix it ... composite modded ZX81 (actually a PAL reversed Timex1000) displays a dark screen ... 's model fits the known "dark screen issue" one then I ... -
ZX81 Dark screen, could it be the ULA?Trying to get a ZX81 going for a mate of mine, already replaced the membrane (Cheers Rich!) but now its the old "very dark screen" problem, probably …
I modded two zx81 for composite (changed the board inside the ... easiest way to solve the dark screen issue is to find ... ?t=32682&highlight=zx81+dark+screen[/url] -
ZX81 Dark screen, could it be the ULA?Trying to get a ZX81 going for a mate of mine, already replaced the membrane (Cheers Rich!) but now its the old "very dark screen" problem, probably …
A composite video fix does not resolve ... black text on a very dark screen.
That is ... , to provide a very stable composite video out, plus adding a ... -
Zx-81 video modHas anyone here done the zx-81 composite video mod?? I am having trouble getting it to work and the info doesn't include which kind of transistor to …
... from the circuit. I get dark video from ULA pin 16 ... if it applies to the composite video mod, but Jose Leandro ... and TS1000s that have the dark image problem. He also explains ... -
Replaced Z80 now a very dark screen!Today I dag out an old issue 3 that ive known for a long time has a faulty Z80 (M1 line) so I heat gunned it out, socketed it and replaced it with a …
... enough if i jiggle the composite lead about I can get ... brighter but it soon goes dark again (I re-did the ... -
+2 (Grey) S-video?I have a pretty good Composite/S-video to VGA adapter that does a nice work of running my retro machines on an old LCD screen. However, it looks best…
... a black or very very dark picture.
RF works ... sound and bad colour.
Composite works with the bad colour ... -
PLEASE HELP!! DEAD SPECTRUM!!Sad News!!! I have a spectrum issue 5 board and I'd done the general composite mod which was great and it worked with a divIDE plus (RWAP) and esxDO…
If I put a cap inbetween the video out and my tv or composite to vga converter, I get a very dark screen.
Haven't tried the transistor mod though. -
Dull picture after composite fix.Yesterday I did the composite fix on my 48k+ but the picture looks duller than it used to be, instead of the white Sinclair Copyright screen being wh…
... capacitor in series with the composite signal.
If I put ... in series with the composite, I get a dark or even black ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... needed for RGB output, and composite output.
Sound works ... the so mentioned Shock Megademo, Dark Star border effect (mmm... I ... /ulaplus_lsddemo.jpg[/img]
Dark Star border effect:
[img ... -
Suggested Spectrum model for retro hobbyist?I'm planning on getting myself a Spectrum of some sorts to add one of the most famous 8-bit computers to my retro collection (already have C64, A1200…
...
[*] rgb (or at least composite)
[*] ay
[*] as small ... /> [/LIST]
[/QUOTE]Spectrum +2 (dark grey colour), Spectrum +2A / Spectrum ... RAM, no RGB video, no composite video (unless modified), no AY ... -
Video output questions...Two questions... [QUOTE]1. The yellow and blue colours seem out of phase on the display. Is this normal for an RF connection to the TV/monitor?[/QUO…
... not you get a very dark, monochrome picture.
The ... to do with pin 20 (composite video & sync), some modern ... -
Spectrum +2(grey) rf problem not tuning inHi lads, first of all a quick intro. Im a speccy enthusiast in Ireland, had my first speccy when i was seven in 1987(grey +2). Eventually it got repl…
... your dark screen on the RF signal, but does affect the composite ... -
Spectrum +2(grey) rf problem not tuning inHi lads, first of all a quick intro. Im a speccy enthusiast in Ireland, had my first speccy when i was seven in 1987(grey +2). Eventually it got repl…
... is only for producing a composite signal at the RGB socket ... this would not cause a dark RF or stop the RGB ... -
Connect spectrum to monitorHello, Probably a stupid question but I'll ask it anyway :) Is there a way to connect a spectrum to a vga or dvi monitor? Thanks, Ant?nio
... and shimmering, its also very dark - I can brighten using the ... inputs from PAL through 3 composite and a VGA. -
Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
+2A/+3 composite modHi, Anyone has experience doing a composite output mod for +2A/+3? (yes.. I also have a working RGB) A while ago I did one based on the instruction…
... chrominance signal and output as composite.
To make ... chrominance output at the old composite output.
To ... output, I copied the normal composite buffer - three diodes, 2K2 ... right. Luminance was actually too dark. Looking back at my ...ZX48 svideo modI have modded a ZX48 to have svideo output. The end of C65 that goes to TR2 (its an Issue 2 zx 48 ) has been lifted to get Chroma. Luma is taken fro…
... Spectrums and looking into doing composite and s-video modifications on ... output of the standard 48 composite circuit (emitter of TR2) ... 75 ohm load on the composite input like most televisions, ... display a good composite picture, but overall it was dark and it ...ZX48 svideo modI have modded a ZX48 to have svideo output. The end of C65 that goes to TR2 (its an Issue 2 zx 48 ) has been lifted to get Chroma. Luma is taken fro…
... Spectrums and looking into doing composite and s-video modifications on ... output of the standard 48 composite circuit (emitter of TR2) ... 75 ohm load on the composite input like most televisions, ... display a good composite picture, but overall it was dark and it ...Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
... .... It is just a bit dark, compared to what I am ... />
And this is the composite output: much less defined, and ... what I would see using composite with those of my spectrums ...Video on single transistor composite video modification for 48K SpectrumsI made a video on the single transistor composite video mod, using an Issue two Spectrum although it applies to all issues. Much better than the sing…
... resistor in the television composite video input completes the ... the 128K circuit produces composite video at twice the ... dark one. When I measured the signals on an oscilloscope, the composite ... circuit protection. If the composite video output is momentarily ...ZX81 Composite mod on the cheap?Hi i'm looking for a good and cheap way to do a composite mod on a broken ZX81 that I have. I know there is a ZXvid on sellmyretro, but the price is …
... ]http://www.sinclairzxworld.com/zx81-composite-video-problem-t248.html[/url ... OK to do the simple composite video modification as this ULA ... black text on a very dark grey screen).
The ...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…
... . If you get a very dark picture with poor contrast (you ... modules are designed to output composite video, not UHF.
composite video.
The modules ... /offer/details/Sinclair-ZX81-ZXVid---Composite-Video%7E%7EULA-Fix-%28self ...Wanted: ZX81 boxed with 16k RAM PackI'm looking for a clean, working and good condition ZX81 with original Sinclair 16K RAM Pack. Would prefer if it was in a box. Oh and if you have 3D …
... composite vid fix though as the original output can be so dark ...Wanted: ZX81 boxed with 16k RAM PackI'm looking for a clean, working and good condition ZX81 with original Sinclair 16K RAM Pack. Would prefer if it was in a box. Oh and if you have 3D …
... composite vid fix though as the original output can be so dark ...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 the type used for composite video on ZX81's). Connect ... transistors emitter) to your TV composite video input. See if this ... notes about it fixing poor, dark grey video issues, so 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…
... what I get from the composite output, although to get a ... screen! It's a very dark image.
The second ... when I first performed the composite video modification, a little lighter ...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…
Samsung TV LCD TV issue sorted, put a 100 ohm resistor on the composite output. Image is a little on the dark side as with the portable TV, but I can see it clearly now.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…
... reply Balford :) It's already composite modded using a capacitor, but ... . There are alternating light and dark narrow vertical stripes running from ...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…
... are 8 vertical lines, 4 dark alternating with 4 light.
composite output) are just more susceptable ... IC and create my own composite output and see what happens ...New video about S-video modification on Issue two 48K Spectrum.I just finished an s-video modification on an Issue two 48K Spectrum so I made a video about it. Most of the technical details are in the video; if y…
... single digit metres), at baseband (composite, s-video and RGB video ... . Don't forget that composite video is called by this ... name because it is a composite of brightness, contrast, black ... sharpness, rolling, poor contrast, too dark etc).
Right, ...
