Sinclair ZX80 / ZX81 / Z88 Forums

I took a snapshot of the UDG designer after loading in the test file. If you load this snapshot into your EightyOne, does it display as per my screenshots?

I've just loaded the test file back into the editor and character 0 and 191 display as I had edited them:


In your screenshots, the I register is shown as 32 whereas in mine they are 33. For 128 character mode, the I register must be odd.

dr beep wrote: ↑Thu May 30, 2024 6:53 pm The chroma-interface is also just setting 2 lines of the character in colour.

Yep. The attributes file always has exactly the same shape of the display file being used.

The problem is whereas at one time all 128 characters could be played with, now only the first 64 show any alteration and when used in a program only characters from the first 64 appear altered with any altered in the 128 region showing as the original character. If I use the designer with a real z...

Do you have WRX enabled in EightyOne? WRX is not compatible with UDGs.

The UDG board creator also wrote a nice simple no complications UDG designer for the zeddy which used to work in Eighty One but now for some reason only works on the first 64 characters Can you point me at where I can download the UDG designer? I don't know why it used to work in EightyOne but no l...

I did not get colour when writing to dfile+#8000 (atrribute mode). What am I doing wrong? Do you have a working exemple? I've put together a quick example. It works with a standard lo-res display file but the principle will work with all forms of pseudo hi-res also. Chroma81AttributeExample.asm Chr...

Here's a screenshot from my demo program:


And here is the asm file for those that wish to see how it works:

Hopefully Dr Beep, you can put it to good use and come up with another 1K masterpiece!

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!

stevenmcdonald wrote: ↑Sat May 11, 2024 1:22 am It blows. my mind that it's highly likely that nobody in the world thought to do this in the 43 years since this computer has been released!

And technically this technique would work on the ZX80 also, and so that's 44 years that no one else has thought of this!