Search found 346 matches

by Fruitcake
Tue Mar 19, 2024 1:06 am
Forum: Development
Topic: Enhanced ARX True High Resolution Display Driver
Replies: 13
Views: 633

Re: Enhanced ARX True High Resolution Display Driver

I have tried the demo on Andy's UDG4ZXpand board on an issue one ZX81 with an issue three ZXpand and got the following results. Thanks. It is nice to know ARX can work with the UDG4ZXpand board, at least in 64 character mode, and therefore there is a base of hardware out there that can run ARX soft...
by Fruitcake
Mon Mar 18, 2024 4:18 pm
Forum: Development
Topic: Enhanced ARX True High Resolution Display Driver
Replies: 13
Views: 633

Re: Enhanced ARX True High Resolution Display Driver

I recall there was an UDG4ZXpand board (which I think Andy created also but correct me if I am wrong). I'm wondering if this will make the 8K-16K RAM provide by the ZXpand ARX compatible. Does anyone know?
by Fruitcake
Mon Mar 18, 2024 4:10 pm
Forum: Development
Topic: Enhanced ARX True High Resolution Display Driver
Replies: 13
Views: 633

Re: Enhanced ARX True High Resolution Display Driver

Moggy wrote: Mon Mar 18, 2024 11:57 am Works with SZ-81 ok.
Thanks, good to know. I used EightyOne to get perfect timing in the display driver but there is of course a chance its emulation is still not 100% accurate. So it is good if other emulators that have been written independently agree with the results from EightyOne.
by Fruitcake
Mon Mar 18, 2024 4:04 pm
Forum: Development
Topic: Enhanced ARX True High Resolution Display Driver
Replies: 13
Views: 633

Re: Enhanced ARX True High Resolution Display Driver

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...
by Fruitcake
Mon Mar 18, 2024 2:38 am
Forum: Development
Topic: Enhanced ARX True High Resolution Display Driver
Replies: 13
Views: 633

Re: Enhanced ARX True High Resolution Display Driver

Here is the source code for the new ARX display driver and demo program, along with the demo program .p file:
ARX_Driver.asm
(12.32 KiB) Downloaded 7 times
Arx_Demo.p
(498 Bytes) Downloaded 21 times
ARX_Demo.asm
(21.13 KiB) Downloaded 15 times
by Fruitcake
Mon Mar 18, 2024 2:35 am
Forum: Development
Topic: Enhanced ARX True High Resolution Display Driver
Replies: 13
Views: 633

Enhanced ARX True High Resolution Display Driver

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...
by Fruitcake
Sat Feb 10, 2024 1:04 pm
Forum: Emulators
Topic: New release of EightyOne available
Replies: 342
Views: 335303

Re: New release of EightyOne available

A minor update to EightyOne is now available which addresses 4 small issues:
https://sourceforge.net/projects/eightyone-sinclair-emulator/
by Fruitcake
Sun Oct 22, 2023 12:20 am
Forum: Emulators
Topic: Eightyone emulator tools issue
Replies: 5
Views: 5305

Re: Eightyone emulator tools issue

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
by Fruitcake
Fri Aug 04, 2023 2:51 pm
Forum: Emulators
Topic: New release of EightyOne available
Replies: 342
Views: 335303

Re: New release of EightyOne available

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...
by Fruitcake
Fri Aug 04, 2023 2:38 pm
Forum: GAMES
Topic: Does this ZX81 Bomber game exist?
Replies: 16
Views: 9356

Re: Does this ZX81 Bomber game exist?

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.