Sinclair ZX80 / ZX81 / Z88 Forums

Hmm, I don't think so... as ARX is based on UDG, it is necessary that the RAM address lines A0~A8 are generated by the ULA, which is not the case with memory expansions connected to the rear expansion bus. Yes, good point! :oops: If I had a 64K RAM pack then this would have been obvious during my t...

Here is the source code for the new ARX display driver and demo program, along with the demo program .p file:

The ARX display technique devised by Andy Rea in 2006 is fascinating in that it could have given true high resolution graphics back in the day using an off-the-shelf 64K RAM pack if only someone had thought to write a suitable display driver [*Correction* - See comment in post from kmurta lower down...

A minor update to EightyOne is now available which addresses 4 small issues:
https://sourceforge.net/projects/eightyone-sinclair-emulator/

You can reposition all windows automatically from within EightyOne using:
View -> Gather Windows.

And you can delete the current .ini file from within EightyOne using:
Options -> Configuration -> Reset To Default Settings

Is it still based on the very first ZX128 emulator? Yep. Many of my lowres games use a trick to store data on the screen. Load games like DIGgIT, MINESWEEPER, SNAKEBINGO, K-MAN, LODERUNNER, 8BITWARS to see what I mean. It is on my Sinclair TO DO list (along with many other things). The necessary ch...

JohnsBargs wrote: ↑Mon Jul 31, 2023 11:50 am https://www.zx81.nl/files/bomber.p

...but it crashes constantly with a 2 error that I can't figure out, so it's hard to tell.

If you start it using RUN then you get a 2/22 error. If your start using GOTO 1 then it appears to run ok.

v1.39 installed for the new debugger menu but it seems that v139 has issue with some of my games. The game works fine using EO v1.39 for me, but only when using the edition 2 or 3 ROM. If the edition 1 ROM is used then the times do not appear as you reported. This is due to the CALL NZ,$19F9 at $42...

I've added a link to the program on my website, along with a note about the need for 8K-16K RAM.

GCHarder wrote: ↑Wed Jun 28, 2023 9:21 pm Hardware required: ZX81 with 16K Rampack optional Chroma interface.

The program works nicely, although I found to get Chroma colour working I needed to enable RAM in the 8K-16K region. The edition 2 or 3 ZX81 ROM is also required else an error 4/1020 occurs.