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Interlaced ZX Spectrum graphic on LCD TV ( vertical hi-res 256x384 )

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This group is about new interlaced ZX Spectrum graphic on LCD TV. This modern TV (ideally full-hd) may show ZX graphic in interlaced mode with 2x higher vertical resolution. Then TV show 2x more TV lines, even… Plus lines contain pixels from one zx tv frame, odd lines contain pixels from next zx tv lines. In this hi-res mode may be visible both videorams from ZX128, similar as on gigascreen, but next colors are realised only via combination of two different hi-res pixels using original 15 zx colors. I will sign this interlace as "LCD mode". Both tv frames are visually mixed and you can see new colors or nice hi-res graphic. For active LCD mode need ZX very very small CPU time (after each interrupt use only OUT 32765,xx for videoram switching).
Dee John, profile picture

Dee John‎Interlaced ZX Spectrum graphic on LCD TV ( vertical hi-res 256x384 )

5 février, 11:20
This years standard Spectrum ULA and ULAplus graphics compo will soon be upon us and will be hosted again at the 2020.1 Speccy.pl Party in April.
This is currently in its 3rd year and hosts various ZX/Sam Coupe… Plus events and demo scene competitions twice yearly in Warsaw, Poland. The second event will be hosted at the end of summer so watch out for the 2020.2 party if you need more time to prepare.
For anybody interested in entering the 2020.1 compo then here are two common art packages that support both standard ULA and ULAplus. These are ZX Paintbrush for Windows and Multipaint for Windows, Mac and Linux.
Remember to complete the registration on the web page below to submit your entry. There is… Plus
Aucune description de photo disponible.
Benjamin Brown, profile picture

Benjamin Brown‎Interlaced ZX Spectrum graphic on LCD TV ( vertical hi-res 256x384 )

2 août, 17:13

Hey chaps, just a quick note to say I'm not sure RetroX is actually interlacing correctly. Test with an image 256x384 and see what happens with padding.

I *think* it's not interleaving. Does anybody have proof it is?

In comparison, if you switch interlace on and off in Image to ZX Spec (256x192 then 256x384 interlaced in drop down), and press the "… Plusplay" button on the main screen, you can quite clearly see a vertical pixel shift.

Basically, in attempting to match the gold standard in detail (RetroX), I *think* I've been chasing something that doesn't actually work but users can't tell the difference... (and which is why the dithering is still correct on Retro X but genuinely interleaved/line skipped in Image to ZX Spec).

Silverio M. Rosales Santana, profile picture

Silverio M. Rosales Santana‎Interlaced ZX Spectrum graphic on LCD TV ( vertical hi-res 256x384 )

23 juillet, 23:10

Good evening everyone, just I crossed over this tittle and my curiosity woke up, and catches my eyes, what a wonderful bunch of pictures, are all of them from a Spectrum? what is it? trying to figure it out and get more information. Is it a gadget? Is a coding technique? How to get it? I am shocked out! Thank you

Benjamin Brown, profile picture

Benjamin Brown‎Interlaced ZX Spectrum graphic on LCD TV ( vertical hi-res 256x384 )

18 mai, 12:15

Does anybody have an algorithm to support 256x384 (256x192 interlace)? I.e. should I be resizing the original image to 256x384, then on the first SCR take the even rows, on the second the odd?
If so how do you compute Gigascreen colour values given that there is different pixel data on both screens (i.e. row 1 on screen 1 shows a different part of… Plus the image to row 1 on screen 2)?
The colours would be completely wrong using data from both screens, e.g. on the original 256x384 image row1 would be pink, and the next pixel down could be dark grey, confusing these to would end up with an interlaced blended red-brown gigascreen pixel, not a pink gigascreen pixel followed by a grey one.

George Velesoft, profile picture

George Velesoft a partagé un lien.

16 mai, 14:53
BUSYSOFT release new utility for convert ZX pictures to GIGASCREEN. Here is original text:

A little app for your pleasure.
In pictures, it converts pixel grid into solid color for gigascreen.
For displaying, it… Plus uses 25Hz switching of two videorams so you can use it on real (CRT) 50Hz monitors, but (of course) the best result you can get with gigascreen mode on MB03+.
Download (app + a few pictures):
http://busy.speccy.cz/tmp/gigascreener1.zip

BUSY.SPECCY.CZ

busy.speccy.cz

George Velesoft, profile picture

George Velesoft a partagé un lien.

28 septembre 2019, 21:23
Today I test also program "Image To ZX Spec" for conversion to gigascreen picture (gigascreen is usable as interlace picture). Conversion is not so fast as in RETRO X but sometime may be usable. Here is absence of RGB setting.

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