Sinclair ZX80 / ZX81 Forums

Hi Jessica

Should you visit these forums again, I've sent you a private message which you'll need to log in to access.

RobertK wrote: ↑

Wed Oct 24, 2018 3:09 pm

Fruitcake: do you think you can patch the ZX81x2 ROM for the Chroma Interface to allow loading programs via RS232?

I'll add it to my TO DO list.

The inlay for the game says: Tempest.gif And this thread provides some details on how the Mikrogen joystick interface is read: https://www.sinclairzxworld.com/viewtopic.php?t=860#p8527 Why I try the game with and without Chroma in EightyOne, both show "PRESS ANY KEY" so Chroma is not conflicting wit...

I managed to load the file and run it, but the game screen remains static. However, pressing BREAK returns to BASIC and so it isn't crashing. Placing a breakpoint at 18823 shows that the machine code is being run at the correct entry point and it does go through the motions of regularly checking the...

I've managed to reproduce the issue you reported using the EightyOne emulator by setting the Chr$ Generator setting in the Hardware dialog to dk'tronics instead of CHR$16 . Even with CHR$16 mode selected, the same issue is seen if the output format selected in CPEC is 8K-64 ; it needs to be 8K-128 ....

I've tried the files again and I don't see the issue you describe. Are you testing in an emulator or real hardware? If an emulator then which one?

I just tried the SPONZY ROM via a ZXC4 ROM cartridge plugged into a Chroma interface and it worked remarkably well. After a bit of trial and error with volume levels I managed to load the Spectrum game Flippit (Sinclair Research Ltd, G26/S) via cassette! Great stuff!!

I programmed the ZX81x2 ROM into a ZXC4 ROM cartridge plugged into a Chroma interface and ran a simple loop that filled the screen with random numbers. The difference in speed compared to the running the same loop using the standard ZX81 ROM is very noticeable and highly impressive! Congratulations ...

Jetpac looks great! Nice work. Have you considered including Chroma colour support in the game? ;) If you have a Window PC then you can use winTZX to create audio files from .p files as and when needed. The utility was improved last year to produce more accurate audio waveforms and also to include s...

A plastic case for the Chroma interface is now available. It is 3D printed and coloured black, with a red reset button to match the red logo of the ZX81's case. All sockets of the interface are exposed, with a hinged cover over the ROM cartridge socket. ChromaInterfaceCase.png The case is composed o...