Search found 257 matches
- Tue Apr 30, 2024 4:32 pm
- Forum: Development
- Topic: 384 rows super HRG
- Replies: 10
- Views: 194
Re: 384 rows super HRG
The idea was to show two different high resolution frames. The second time the CRT beam should pass slightly shifted, between the previously displayed lines. This could produce a 192x2 picture, slightly flickering with overlapped pixels no clue on how to slightly shift the lines but the idea seems ...
- Tue Apr 30, 2024 12:50 pm
- Forum: Software
- Topic: Block save / load
- Replies: 29
- Views: 10169
Re: Block save / load
The loader routine is just 17 bytes ("_BEG" to "_END"), and it is relocated to the end of the memory at the program start. Everything else is rewritten as all the rest of the memory during the load process. And become even 16 bytes because the loader stop when it starts overwriting itself (for now j...
- Tue Apr 30, 2024 3:13 am
- Forum: Software
- Topic: Block save / load
- Replies: 29
- Views: 10169
Re: Block save / load
I have at the moment no means to test it (my dev environment is broken), but the following program should be able to fully load 1008 bytes into memory (from 0x4000 to 0x4400 - 16 bytes)... The block to be load should be saved with standard routines and should be equal or bigger than 1008 bytes (if b...
- Tue Apr 30, 2024 3:04 am
- Forum: Development
- Topic: 384 rows super HRG
- Replies: 10
- Views: 194
Re: 384 rows super HRG
384 lines :o :o :o what type of sourcery are you trying to use?? I was thinking about the fact that since the ZX is "executing" the display and on a standard machine if I remember properly just 25% is left for the program execution, doubilng the "execution of the display" should not be possible sinc...
- Sun Apr 28, 2024 3:01 am
- Forum: Software
- Topic: Block save / load
- Replies: 29
- Views: 10169
Re: Block save / load
... Advantages: 1. will load from 4000h instead of 4009h allowing to immediately fill this space with data 2. will allow immidiate utilization and filling of system variables needed by BASIC (program will start immediately the machine code) 3. will avoid the basic program skeleton to start the mach...
- Fri Apr 26, 2024 8:54 pm
- Forum: Welcome Area
- Topic: Mandatory intro post / 6502 Z80 content
- Replies: 4
- Views: 1141
Re: Mandatory intro post / 6502 Z80 content
Beautiful collection!!!
- Fri Apr 26, 2024 5:22 pm
- Forum: Software
- Topic: Block save / load
- Replies: 29
- Views: 10169
Re: Block save / load
This is an interesting thread. Is a long time that I was thinking that in order to fully (at least to the maximum extent) utilize the 1K memory it would be good to have a extremely small piece of code that (also reusing the standard load routines) could load programs. It means that first you would l...
- Sun Nov 19, 2023 7:26 pm
- Forum: ZX BASIC
- Topic: ZX81 1K Space Saving Tips by Sean A Irvine
- Replies: 2
- Views: 8031
Re: ZX81 1K Space Saving Tips by Sean A Irvine
As an additional comment, if you don't need floating point or flicker free running screen, ZX80 basic is both more efficient on memory and much much faster!
- Sun Oct 08, 2023 5:10 pm
- Forum: Development
- Topic: A veri nice escursion on the ZX80 and ZX81 video generation
- Replies: 0
- Views: 13430
A veri nice escursion on the ZX80 and ZX81 video generation
A bit longish but very nicely done. This series of videos take you step by step to the final design: 1. https://www.youtube.com/watch?v=pVQJxV9JCSE - ZX80/81 Video circuit generated from scratch 2. https://www.youtube.com/watch?v=T5yu_0K32s8 - Video circuit revealed, hi-res display of 256 x 192 pixe...
- Tue Sep 26, 2023 11:48 am
- Forum: WANTED
- Topic: Looking for a ZX80 manual
- Replies: 1
- Views: 5679
Re: Looking for a ZX80 manual
Here online in case useful: https://archive.org/details/zx80operati ... l/mode/2up