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Challenging the orthodoxy - Composite modWell, what's brought this on is two things: firstly I composite-modded an Issue 4S board this weekend in preparation for the Vintage Computing Festiv…
... They brushed up the video stage needed for the ZX81 ... -out of the existing video signal is low enough to ... When we consider video as a 10 MHz signal then the ...
The '75 Ohm video' is no real load concerning ... mixing the UHF with the video over this 390 Ohm. ... -
Challenging the orthodoxy - Composite modWell, what's brought this on is two things: firstly I composite-modded an Issue 4S board this weekend in preparation for the Vintage Computing Festiv…
... 'Elektuur'. They brushed up the video stage needed for the ZX81 ... a b&w composite video signal directly out of an ULA ... -
Challenging the orthodoxy - Composite modWell, what's brought this on is two things: firstly I composite-modded an Issue 4S board this weekend in preparation for the Vintage Computing Festiv…
... level is added to the signal. Most TV sets do the ... a stage just before the video driver of the tube. But ... therefore some devices need correct video signal. I had a not very ... direction. Driven with bad leveled signal it does not synchronize the ... -
TV tuning problemI've just discovered that I can't tune in any of my Spectrums on my new TV. (Well, "new" in the sense that it's an old one I was given to replace an …
... also relies on the composite video signal being on the expansion connector ... later models also lack this signal)? -
RGB SCART Not Working on ZX 128K (heatsink)I've just received a SCART RGB to HDMI converter and it is not working with my ZX 128K (heatsink). I do have the correct 128K SCART cable (which is d…
... digital signal. I guess for me digital video signal is things like signal ... analog. The TTL RGB signal from 128K is technically called ... more sensitive than another for signal levels? What's the ... usual solution to correct the signal?
Thank you ... -
Anyone else have a fanboy problem?Over the past 18 months or so, there's been one individual (don't worry, I don't think he posts here, he has a very *ahem* "distinctive" writing styl…
... retro x to convert avi video from pc to sam coupe ... 320x200
anyone worked out interlaced video on sam? do we need ... -
Anyone else have a fanboy problem?Over the past 18 months or so, there's been one individual (don't worry, I don't think he posts here, he has a very *ahem* "distinctive" writing styl…
... retro x to convert avi video from pc to sam coupe ... 320x200
anyone worked out interlaced video on sam? do we need ... -
RGB SCART Not Working on ZX 128K (heatsink)I've just received a SCART RGB to HDMI converter and it is not working with my ZX 128K (heatsink). I do have the correct 128K SCART cable (which is d…
... ]um, VGA monitors use analog signal..[/QUOTE]
Yes, but ... lot of processing on the video signal, and therefore, require strict ... very little processing on the video input, so they are more ... forgiving to non uniform video signals. So forgiving that you ... -
Silly question on Russian clonesIv a silly question to ask... Iv been looking at web links about Russian ZX clones with envious eyes, wondering if I might spend money on something…
... them has no color composite video signal encoder, RGB only. Clones with ... -
Aphex Twin -VS- ZX SpeccyThere?s no need to introduce this musician to the islanders (..means GB and roundabouts). You surely know him very well. Imaginative, strongly experi…
... codes that retuned the TV signal so that it made this ... induced excessive sidebands in the video signal, the lower sideband was forced ... audio portion of the TV signal's spectrum. While the ZX81 ... the lower sideband of the video signal out, its simple circuitry did ... -
Getting a ZX Spectrum to work in the USHello all, I'm terribly new to these forums but not to the use of the Spectrum. I have a few in my collection of old machines and one of them I am …
... to the luminance video signal to form a composite video baseband signal. The frequency ... the colour information on the video signal is reversed with each line ... in the transmission of the signal by cancelling them out, at ... -
Help me understand ZX RGB signal (long)This will be a long post so please bear with me and most importantly help me. I have a 128K+ and +2A that I'm trying to get working with my 15kHz RG…
... pin16 is connected to composite video 1,2V.
AFAIK ... , composite video is not 1,2V. it ... voltage or something. its a signal, not DC.
try it ... time did not get any video signal. Maybe it needs more than ... -
Developing ZX Spectrum using 8 chipsHello. Sorry, my english is not perfect. I am developing new realising of ZX Spectrum. There are 8 chips in my sch. Central processor and video proce…
... AND generate spectrum resolution colour video in a '128.
I have allready wrote: for video signal i am using one processor ... -
Developing ZX Spectrum using 8 chipsHello. Sorry, my english is not perfect. I am developing new realising of ZX Spectrum. There are 8 chips in my sch. Central processor and video proce…
... ]I have allready wrote: for video signal i am using one processor ... -
Developing ZX Spectrum using 8 chipsHello. Sorry, my english is not perfect. I am developing new realising of ZX Spectrum. There are 8 chips in my sch. Central processor and video proce…
... emulating and making of colour video signal using 2 ATMega 128. I ... more: i have allready made video signal and wrote about 80 % emulating ... -
Developing ZX Spectrum using 8 chipsHello. Sorry, my english is not perfect. I am developing new realising of ZX Spectrum. There are 8 chips in my sch. Central processor and video proce…
... ? I have SCH, PCB and video record of video signal i formed. -
Developing ZX Spectrum using 8 chipsHello. Sorry, my english is not perfect. I am developing new realising of ZX Spectrum. There are 8 chips in my sch. Central processor and video proce…
Developing ZX Spectrum using 8 chipsHello. Sorry, my english is not perfect. I am developing new realising of ZX Spectrum. There are 8 chips in my sch. Central processor and video proce…
... you .PCB, .SCH and video record of video signal. You only must tell ...DMA interface for ZX Spectrum[url]http://velesoft.speccy.cz/data-gear.htm[/url] This is internal DATA-GEAR interface for any 8-bit computer with Z80CPU. Use Direct Memory Access…
any chance of some video of wokring dma for sam?< ... -type smooth scorlling ? pixel sprites? interlaced video 384x256 with tv 90degrees to ...DMA interface for ZX Spectrum[url]http://velesoft.speccy.cz/data-gear.htm[/url] This is internal DATA-GEAR interface for any 8-bit computer with Z80CPU. Use Direct Memory Access…
... ;479292]any chance of some video of wokring dma for sam ... -type smooth scorlling ? pixel sprites? interlaced video 384x256 with tv 90degrees to ...+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…
... that adds sound to the video signal! This isn't documented in ...+2a CompositeWhile faffing around with my +2a I did a down and dirty mod from pin 6 of the tea2000 straight to the modulator output bit like the womble hack for t…
... to work with a composite video input, but the datasheet implies ... , any problem in the composite video and you'll burn your ... the mixing of sound into video signal, and after solving that I ... do something useful with the video output.DMA interface for ZX Spectrum[url]http://velesoft.speccy.cz/data-gear.htm[/url] This is internal DATA-GEAR interface for any 8-bit computer with Z80CPU. Use Direct Memory Access…
... ;479292]any chance of some video of wokring dma for sam ... -type smooth scorlling ? pixel sprites? interlaced video 384x256 with tv 90degrees to ... ram refresh and certainly no video ula ram contention to contend ...emulatorsplease help can we see clearly which emulator emaulates which hardware is there any that has a pc function key for the mulitface nmi button and the +…
... ;479292]any chance of some video of wokring dma for sam ... -type smooth scorlling ? pixel sprites? interlaced video 384x256 with tv 90degrees to ...Challenging Common Knowlege: The +2A/B[I]I was going to write a big long essay about my research on this subject, but being an incredibly lazy person I never really got anywhere with that…
... 's been modulated onto the video signal, but this isn't the ...Challenging Common Knowlege: The +2A/B[I]I was going to write a big long essay about my research on this subject, but being an incredibly lazy person I never really got anywhere with that…
... 's been modulated onto the video signal, but this isn't the ...Help, I have no idea what I'm doing :-)Hi guys, As it says in the title and my user name, I have no idea what I am doing :-) Both Hubby and I are 'children of the 80's', whereas I had an…
... it supplies a strong enough signal and doesn't apply any ... output a composite video signal instead of an RF signal, but this is ...Running a Spectrum in the USI didn't realise how much hastle it was to set up a UK PAL Spectrum in the US. [url]http://wn.com/List_of_ZX_Spectrum_games[/url]. I knew about the …
... ...
As for composite video mod: 'tape apart ZX Spectrum ... for NTSC). Gives a PAL video signal but with NTSC-frequency color ...Question about ZX81 componentAfter I cleaned and replaced some components (7805, two electrolytic caps) with fresh ones, and replaced the RF board with a composite one, on an iss…
... signals from getting into the video signal (which is now happening cause ...48k rubber key screen corruption[IMG][URL=http://img195.imageshack.us/i/img7398g.jpg/][IMG]http://img195.imageshack.us/img195/5563/img7398g.th.jpg[/IMG][/URL] Uploaded with [URL=htt…
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The ULA generates the video signal. So with a dead ULA ...
