Search found 306 matches
- Sun May 19, 2024 11:48 pm
- Forum: Software
- Topic: ASM : Lambda speaker.
- Replies: 5
- Views: 658
Re: ASM : Lambda speaker.
Am not real keen on hardware additions, such as what would be required for a real ZX81, such as a LPT1 DAC, or even playing through plugged in amplified speakers into the cassette port. Since Emulators cant really emulate this stuff. Believe me, ZX81 emulators can emulate the sound generated throug...
- Mon Apr 01, 2024 12:14 am
- Forum: Development
- Topic: ZX81 Toddy Forth-79
- Replies: 48
- Views: 18585
Re: ZX81 Toddy Forth-79
When compiling I get this error. (real ZX81 not emulator) I apologize Fred, it was my fault, the HTERM.BLK file was incomplete, missing a page, hence the compilation error. I have already fixed the issue and updated the zip package above. In any case, the ARX.F79 and EDARX.F79 files were compiled c...
- Sun Mar 31, 2024 5:34 pm
- Forum: Software
- Topic: Forth Hints & Tips: Kaleidoscope
- Replies: 13
- Views: 5757
Forth Hints & Tips: C64 one line labyrinth
Forth variant: TF79 (Requires UDG or HGR extension) You probably know this famous one-line BASIC program from the Commodore 64 : 10 PRINT CHR$(205.5+RND(1)); : GOTO 10 Here my version for the TF79: : LAB CR BEGIN 47 45 2 RND * + EMIT AGAIN ; As it uses special characters, it must be run with UDG mo...
- Sun Mar 31, 2024 5:06 am
- Forum: Development
- Topic: ZX81 Toddy Forth-79
- Replies: 48
- Views: 18585
ZX81 Toddy Forth-79 - Enhanced ARX Driver
I bring here Paul Farrow's Enhanced ARX Driver , ported to the TF79. The main advantage of the ARX driver over the WRX, especially for those using the UDG4ZXpand board, is being able to switch from the text terminal to the graphics terminal without having to worry about jumpers or switches. However,...
- Sun Mar 24, 2024 10:20 pm
- Forum: Software
- Topic: Forth Hints & Tips: Kaleidoscope
- Replies: 13
- Views: 5757
Forth Hints & Tips: Truchet Quarter-circles tiles
Forth variant: TF79 (Requires the HGR extension)
Reference: https://en.wikipedia.org/wiki/Truchet_t ... er-circles
Note how screen 7 was used to load the program, since screens 1 to 6 are occupied by the high-resolution screen.
Reference: https://en.wikipedia.org/wiki/Truchet_t ... er-circles
Note how screen 7 was used to load the program, since screens 1 to 6 are occupied by the high-resolution screen.
- Wed Mar 20, 2024 1:41 am
- Forum: GAMES
- Topic: Snake Game - a game written in Forth
- Replies: 4
- Views: 3143
Snake Game - Some optimizations
We saw previously that the snake becomes slower as it grows and the main reason for this is the DRAW-SNAKE routine: : DRAW-SNAKE LENGTH @ 0 DO I SNAKE-X C@ I SNAKE-Y C@ DRAW-BLACK LOOP LENGTH @ SNAKE-X C@ LENGTH @ SNAKE-Y C@ DRAW-WHITE ; Note that the snake is completely redrawed for each cycle, whi...
- Tue Mar 19, 2024 12:12 pm
- Forum: Development
- Topic: Enhanced ARX True High Resolution Display Driver
- Replies: 53
- Views: 13327
Re: Enhanced ARX True High Resolution Display Driver
So it sounds like on the UDG4ZXpand there is a physical jumper that must be set to enable 128 character mode. For Chroma 81, the RAM in the 8K-16K region (if enabled) is always capable of 128 character mode and it is bit 0 of the I register that determines whether to use 64 or 128 character mode. I...
- Mon Mar 18, 2024 7:31 pm
- Forum: Development
- Topic: JOY81 - Programmable Joystick Interface for ZX81
- Replies: 102
- Views: 67888
- Mon Mar 18, 2024 4:25 pm
- Forum: Development
- Topic: Enhanced ARX True High Resolution Display Driver
- Replies: 53
- Views: 13327
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? Yes, all external RAM connected to UDG4ZXPAND is capable of providing UDG xor WRX. Selection ...
- Mon Mar 18, 2024 3:09 pm
- Forum: Development
- Topic: Enhanced ARX True High Resolution Display Driver
- Replies: 53
- Views: 13327
Re: Enhanced ARX True High Resolution Display Driver
Excellent! ARX is a great option to use with Brazilian TKs clones, which do not tolerate WRX very well. As soon as I have time I will test it on my TK85. 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 usi...