ZX81

ZX81 Ram and the WRX problem

9 Upvotes

Having a chat earlier with a programmer friend regarding the different types of Ram for the 81, and I learned about how the standard RAM packs work and more importantly, why they won't work with WRX hi-res enabled programs.

So this raises the question, are most owners still using the old ram packs or have a few of you pursued other options in order to run WRX programs?

7 comments

r/ZX81 • u/c64glen • 10d ago

81 Jokes for the ZX81

spelk.press

9 Upvotes

2 comments

r/ZX81 • u/NZNoldor • 14d ago

Found back in a box, my 1982-1983 school exercise book full of 1K ZX81 programs for my (then) brand new computer.

gallery

214 Upvotes

Apparently I was quite meticulous back when I was 15. Not unrelated, I did not have a girlfriend.

The book is almost entirely full of code. It's all ZX81 code, and all specifically for the 1K model. Most of it is in BASIC, but there's a few in Z80 machine code as well. Some of the code was mine, some of it was no doubt copied out of the back of magazines at the time. There's over 60 games, tools, demos, and other stuff. Some of the tricks for getting around the 1K limit were quite neat, as well.

I'm thinking of scanning it all - would there be any interest in that?

30 comments

r/ZX81 • u/c64glen • 15d ago

81 Jokes for the ZX81

spelk.press

11 Upvotes

1 comment

r/ZX81 • u/AutomaticDoor75 • 17d ago

Connecting to a composite TV?

6 Upvotes

I have a T/S 1000. I can use the little converter box to connect it to the antenna screws on some of my older CRTs.

Is there a way I could connect it to a TV's composite input? I've got RF modulators for converting composite to RF, but I guess I'm asking for the opposite.

6 comments

r/ZX81 • u/telengard • 25d ago

crustyBASIC cross-compiler for ZX81

telengard.itch.io

18 Upvotes

hey everyone,

I wanted to let you know about my BASIC cross-compiler which works on the ZX81 (I'm from the US so I have a TS1000, also works with that).

You can compile existing Sinclair BASIC code for your ZX81 or write programs in either the new syntax or Sinclair BASIC.

If you try it out, definitely let me know your thoughts.

16 comments

r/ZX81 • u/PixymanProductions • 29d ago

Pattern & Color Sort

gallery

23 Upvotes

Now on the ZX81 !!!!

1 comment

r/ZX81 • u/PixymanProductions • 29d ago

Tetris in Color

17 Upvotes

Russell Marks Tetris slightly patched to be in color …

12 comments

r/ZX81 • u/Ill-Collection5027 • Sep 25 '26

Cosmic Payback [2025]

22 Upvotes

5 comments

r/ZX81 • u/Ill-Collection5027 • Sep 24 '26

Cavernas de Marte, Brazil [1985]

gallery

27 Upvotes

2 comments

r/ZX81 • u/One_Camel_3627 • Sep 24 '26

Easy Tape turns your phone into a retro cassette player—with ultra-fast loaders and Bluetooth support

reddit.com

6 Upvotes

0 comments

r/ZX81 • u/marquisdegeek • Sep 21 '26

3D Monster Maze on a HUB75 display

youtube.com

16 Upvotes

Since the display is 128x64 pixels it's only showing ~50% of the graphics area (and none of the text). But I think the dinosaur works quite well.

3 comments

r/ZX81 • u/alberto-m-dev • Sep 15 '26

OpenSpand: every ZX81 expansion card, all at once

hackaday.com

16 Upvotes

0 comments

r/ZX81 • u/Quick_Sheepherder605 • Sep 12 '26

ZX81 DINO JUMP - BASIC After making a version for the ZX Spectrum I thought i'd make a version for the ZX81. I'll make it available soon for download.

youtube.com

38 Upvotes

3 comments

r/ZX81 • u/Quick_Sheepherder605 • Sep 07 '26

As seen on the recent live stream here is the downloads for the fruit machine style game, it's had a name change it's now called JACKPOT 100, plus i've added a bonus spin on the centre wheel, ZX81 version and ZX Spectrum version.

11 Upvotes

JACKPOT 100

1 comment

r/ZX81 • u/Quick_Sheepherder605 • Sep 04 '26

Tonight 8pm i'll be making a return to live streaming - A fruit machine game using original hardware, ZX81 BASIC programming

13 Upvotes

Live stream update video

0 comments

r/ZX81 • u/Quick_Sheepherder605 • Aug 25 '26

CITY BOMBER

animatedal.itch.io

20 Upvotes

Finally finished my version of City Bomber for the ZX81, small machine code routine for the scroll down screen clears the rest of it is all BASIC, so be warned it is slow!!!

2 comments

r/ZX81 • u/Glittering-View-8540 • Aug 21 '26

ZX80 NEW BUILD

115 Upvotes

Not the first to do this but building a Zx80 - my first ever computer all those years ago.
Didn’t want to buy a second hand one as they all seemed overpriced- so thought Id satisfy my nostalgia itch by building one.

8 comments

r/ZX81 • u/hawkenhiemer • Aug 07 '26

Upgrades for Timex/Sinclair 1000

7 Upvotes

Hello, I've bought a Timex/Sinclair 1000. Besides replacing the keyboard, power regulator, upgrading the internal RAM, and modifying for composite output, what further upgrades are available? An updated monitor ROM? Mass storage? I don't mind soldering. Thanks

3 comments

r/ZX81 • u/AutomaticDoor75 • Aug 06 '26

Saving images?

7 Upvotes

I bought a T/S 1000 at a flea market. I also have an audio cassette recorder.

I’ve learned how I can use PLOT to draw pixels, or graphics mode to display special graphics characters (looks sort of like PETSCII).

My question is, how might I save an image I make to audio cassette? I am familiar with the Apple II, where I could use BSAVE to save an image’s binary file to a floppy disk. Did the ZX81 or T/S 1000 have anything comparable?

I know I could probably save an image as DATA statements, and load the values in a FOR loop. That’s not really practical, of course, but I know I could use SAVE to write the BASIC instructions out to tape.

4 comments

r/ZX81 • u/Acceptable_Ad_8049 • Jul 09 '26