Sinclair ZX80 / ZX81 / Z88 Forums

Try CONFIG "M=H" before the program...
EDIT: now included in the release-files.

This software enables a ZX81 with a ZXpand-interface to do a slideshow of hires pictures, all programmed in BASIC.<br> The pictures are monochrome 256x384 pixels, and can be created quite easily. Docs and code at https://github.com/NollKollTroll/mono_slideshow EDIT: Now with CONFIG "M=H", 50 & 60Hz ...

This software enables a ZX81 with both Chroma- and ZXpand-interface to do a slideshow of hires colour pictures, all programmed in BASIC.<br>
The pictures are 15 colours 256x384 pixels, and can be created with the included converter.

Docs and code at https://github.com/NollKollTroll/chroma_slideshow

Moggy, forget about 16-bit audio. But it WOULD be possible to do 8-bit stereo... And possibly logarithmic u-law audio to get better/different sound quality.

Updated the code to remove a pesky bug. Binary in the first post, source and more documentation on Github.

No problem reading an audio book, the only limit is each track can be max 12.5 minutes long. Split into multiple files, and the next limit is rhe size of the SD-card. Not a tight limit

Doing things it never even dreamed of...

Moggy there is indeed an 8-bit R2R-DAC player already out, see https://www.sinclairzxworld.com/viewtopic.php?f=6&t=4844 The documentation on how to build the DAC is non-existing though... It's basically using the same stuff as the old printer port sound cards for PCs, like this one: https://www.juba...

Moggy was wondering how this is done, so here is a general description of the tech behind it all. The code runs in FAST mode, shutting of the picture generation. The HSYNCs are still generated in the background at 15700Hz though, impossible to turn off on the ZX81. The code is divided into 2 state-m...

I made a version of Zeddy Audio Jukebox that plays 8-bit audio through a simple R2R-DAC on port B of the AY/YM sound-chip. Sample rate 22109 Hz is less than 0.27% faster than 22050 Hz, so easier to convert audio with any sound programs. Here is a binary release with a player that replays the wonderf...