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!
Search found 356 matches
- Thu May 16, 2024 12:58 am
- Forum: Development
- Topic: LOWRES -demo
- Replies: 36
- Views: 2454
- Wed May 15, 2024 9:37 pm
- Forum: Development
- Topic: LOWRES -demo
- Replies: 36
- Views: 2454
Re: LOWRES -demo
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!
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!
- Sat May 11, 2024 3:50 pm
- Forum: Development
- Topic: LOWRES -demo
- Replies: 36
- Views: 2454
Re: LOWRES -demo
And technically this technique would work on the ZX80 also, and so that's 44 years that no one else has thought of this!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!
- Sat May 11, 2024 2:51 pm
- Forum: Development
- Topic: LOWRES -demo
- Replies: 36
- Views: 2454
Re: LOWRES -demo
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:
- Sat May 11, 2024 1:49 am
- Forum: Development
- Topic: LOWRES -demo
- Replies: 36
- Views: 2454
Re: LOWRES -demo
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.
- Fri Apr 05, 2024 6:14 pm
- Forum: Development
- Topic: Enhanced ARX True High Resolution Display Driver
- Replies: 53
- Views: 13333
Re: Enhanced ARX True High Resolution Display Driver
While testing the new driver I noticed that DSTAR crashes in 192 rows mode unless I add at least one NOP instruction. I'm not sure whether the crash is caused by a memory alignment problem or timing/sync issues, other programs run smoothly on EO. Can you share the program with and without the NOP a...
- Wed Apr 03, 2024 1:21 pm
- Forum: Development
- Topic: Enhanced ARX True High Resolution Display Driver
- Replies: 53
- Views: 13333
Re: Enhanced ARX True High Resolution Display Driver
could anybody see if it fixes the problem ? The program now displays ok in EightyOne but still has issues that my new display driver resolves. Here is the output from EightyOne: NewHangman.png The VSync pulse starts and ends about 2/3rds of the way across a scanline and this upsets the output from ...
- Wed Apr 03, 2024 1:17 am
- Forum: Development
- Topic: Enhanced ARX True High Resolution Display Driver
- Replies: 53
- Views: 13333
Re: Enhanced ARX True High Resolution Display Driver
I tried to compare it with the Paul's one but it's tricky ! Yeah, it would be as I completely rewrote it from scratch. Paul, do you have an old version of the same driver to understand how it evolved ? Sure, below is the ARX display driver that Andy originally posted on his now defunct website. 15/...
- Wed Apr 03, 2024 12:47 am
- Forum: Development
- Topic: Why Does The Border Have to Be White?
- Replies: 4
- Views: 1481
Re: Why Does The Border Have to Be White?
Well, today is the 2nd of April. And for those of us that don't have a ZX8-CCB fitted then a software mechanism that can output the border black will just have to do.
- Mon Apr 01, 2024 1:45 pm
- Forum: Development
- Topic: Why Does The Border Have to Be White?
- Replies: 4
- Views: 1481
Why Does The Border Have to Be White?
Doesn't time fly? It's the beginning of April already! What better than to start off the first day of the new month with an interesting development. Have you ever played a ZX81 game that is set on a black background but felt that the look of it was somewhat let down by the border having to remain wh...