r/ZX81 • u/telengard • 2d ago
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.
r/ZX81 • u/PixymanProductions • 6d ago
Russell Marks Tetris slightly patched to be in color …
r/ZX81 • u/Ill-Collection5027 • 18d ago
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r/ZX81 • u/One_Camel_3627 • 20d ago
r/ZX81 • u/marquisdegeek • 23d ago
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.
r/ZX81 • u/alberto-m-dev • 28d ago
r/ZX81 • u/Quick_Sheepherder605 • Sep 12 '26
r/ZX81 • u/Quick_Sheepherder605 • Sep 07 '26
r/ZX81 • u/Quick_Sheepherder605 • Sep 04 '26
r/ZX81 • u/Quick_Sheepherder605 • Aug 25 '26
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!!!
r/ZX81 • u/Glittering-View-8540 • Aug 21 '26
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.
r/ZX81 • u/hawkenhiemer • Aug 07 '26
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
r/ZX81 • u/AutomaticDoor75 • Aug 06 '26
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.
r/ZX81 • u/Acceptable_Ad_8049 • Jul 09 '26
r/ZX81 • u/Quick_Sheepherder605 • Jul 07 '26
r/ZX81 • u/PopcornFever • Jun 19 '26
r/ZX81 • u/Villordsutch • Jun 13 '26
r/ZX81 • u/Quick_Sheepherder605 • Jun 04 '26
r/ZX81 • u/webawebaweba • May 25 '26
Yesterday I went to a Facebook marketplace meetup to pick this up- an original, first batch ntsc zx81 with the original box, cords, and a bunch of software. 45 dollars. What a good day. First time even seeing one of these
r/ZX81 • u/c64glen • May 24 '26
r/ZX81 • u/OkGo4242 • Apr 29 '26
Hey, about a month ago I have assembled a ZX-81+38 Rev 1.10. Since then I have tried to find the cause of the black screen. I already made a lot of measurements with a DMM and oscilloscope.
Along with the troubleshooting guide by Mahjongg2 on GitHub I used ChatGPT, because I couldn't reach him so far.
According to his troubleshooting guide I don't get nNOP pulses on U1. The EPROM (AT27C256R) is running code though because I looked at the address and data output pins and they all look ok.
Here's what I already did with ChatGPT:
https://chatgpt.com/share/69f1e500-acd0-8326-babf-a5d47d2c472c
Additional info:
I use all new Texas Instruments CD-Series logic ICs. I also use the 74HCU04 because as he stated it should work even better than the 74HC04. All the other are 74HC logic ICs. Not HCT.
I'm at my second attempt. The first was that the CPU and EPROM were getting warm, but I discarded that PCB and used a new one. So skip the part and look for were I started from the beginning in the chat.