Sinclair ZX80 / ZX81 / Z88 Forums

I am working on a game using this method so no time trying the trick you worked out.

Haha.... you did the same trick as I did in the character8 display.

Dr Beep, your ZX81 work is truly inspiring! Your new approach got me thinking and I've came up with a twist on your original idea and put together a simple 1K demo. I hope you like it! LoHiRes.p Wel done, you are close to my current idea in the display so I am gonna take a look in your screen.

I had an idea how to make it work for all 8 lines.

My first try last week did not work flawlessly but my current approach is working.

This is character 8 with the even lines inverted so you get 4 lines on a character.

I need to write a manual how you can do both methods.

You are indeed correct. But if you only wanted to display one row of characters then you'd save a byte at least. Or if you wanted to display multiple rows and your program could tolerate having a non-uniform row length then you could start each row with LD H,D / LD L,E: My next game needs fixed len...

It's a very interesting new technique. As an optimisation, you can replace the two instructions LD H,D and LD L,E with single instruction EX DE,HL to achieve the same effect but using 1 less byte per row. That was my first try too, but now try printing 2 lines of telephone, then you get an errordis...

Lardo Boffin wrote: ↑Tue May 07, 2024 6:44 pm This works fine on my TS1000. Very impressive!

How do I attach a video? It says the file is too large.

Otherwise set the video on facebook or youtube and the link here.

Moggy wrote: ↑Tue May 07, 2024 2:56 pm Can't wait to see a practical use for this.

I have a conversion of a game on the shelf for years.
I wanted to be LOWRES, not TRUE HIRES. Pseudo hires was not quite a simple thing to use. Now I have already generated some necessary graphics.

Why doesn't it fit 1K? I can help to make it fit. It really wasn't even that close to fitting into 1K, so I'm okay with it being 2K. Optimization tips would be welcome, but I will likely use them to fit as much as I can into 2K. I have experience with 6502 assembly, but this is my first time using ...

I have made a generator to use:

QAOP for control
Space is invert current character