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.
Search found 302 matches
- Sun Mar 24, 2024 10:20 pm
- Forum: Software
- Topic: Forth Hints & Tips: Kaleidoscope
- Replies: 11
- Views: 774
- Wed Mar 20, 2024 1:41 am
- Forum: GAMES
- Topic: Snake Game - a game written in Forth
- Replies: 3
- Views: 352
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: 13
- Views: 667
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: 61573
- Mon Mar 18, 2024 4:25 pm
- Forum: Development
- Topic: Enhanced ARX True High Resolution Display Driver
- Replies: 13
- Views: 667
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: 13
- Views: 667
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...
- Sun Mar 17, 2024 3:17 am
- Forum: Development
- Topic: werewolf for the zx81 16k
- Replies: 11
- Views: 793
Re: werewolf for the zx81 16k
KEY is missing but INKEY isn't, so you can define KEY as
: KEY BEGIN INKEY ?DUP UNTIL ;
Take a look at chapter 16 of the manual, it will help a lot!
: KEY BEGIN INKEY ?DUP UNTIL ;
Take a look at chapter 16 of the manual, it will help a lot!
- Sat Mar 16, 2024 10:59 pm
- Forum: Development
- Topic: JOY81 - Programmable Joystick Interface for ZX81
- Replies: 102
- Views: 61573
Re: JOY81 - Programmable Joystick Interface for ZX81
Remembering that you must provide the piggyback connector, although I think this other solution is better: https://www.zx81keyboardadventure.com/2 ... iGfnhStNoE
- Sat Mar 16, 2024 10:43 pm
- Forum: GAMES
- Topic: Snake Game - a game written in Forth
- Replies: 3
- Views: 352
Snake Game - a game written in Forth
There is this good tutorial on the Forth language which presents at the end a small game written in Forth, Snake!. We will see that the task of transcribing it for the Forth-79 is very simple, even though the game was written to run on modern PCs. Before proceeding, I suggest you read the original a...
- Sat Mar 16, 2024 9:50 pm
- Forum: Development
- Topic: JOY81 - Programmable Joystick Interface for ZX81
- Replies: 102
- Views: 61573
Re: JOY81 - Programmable Joystick Interface for ZX81
I know that there are still people interested in obtaining a JOY81, but unfortunately at the moment I am unable to start producing a new batch. I still have some PCBs left but unfortunately the cost to send them outside of Brazil is excessive (more than 30GBP), so I will make the files available her...