Sinclair ZX80 / ZX81 / Z88 Forums

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...

Play audio from SD-card using a ZX81 and ZXpand classic or plus! Output on tape out AND sound chip if available, with pretty display effect. Binary player with 4 songs are attached. I only got it working on real ZX81, no emulators. Read the details or get the source code at https://github.com/NollKo...

I did some quick calculations.
A single video file @20fps can be a bit longer than 54 minutes. Max 65536 frames.
A 2h video divided into chapters, would take about 211MiB. A LOT of video can live on a modern SD-card

Does this work with sx81p? All I get in the player window (the rectangle in centre of screen) is what looks like static 1. copy all files to the ZXpand_SD_Card directory 2. start sz81-win32\sz81p.exe 3. LOAD "MENU" 4. arrow to zvj60.p and press NEWLINE I have not tested on sz81, so could not say. I...

I made a video player for the ZXpand plus a while ago https://sinclairzxworld.com/viewtopic.php?f=6&t=2641 The time has now come for an updated version, working on both the ZXpand classic and the plus. This time only video, no fancy audio. I've done the code and have a github repo ready, a proper re...

I just constructed the ZX-wespi video-version, and installed the esp32-tools for Linux. What was missing is how to flash the different binaries to the esp32 the first time. Here are the commands I used in the correct order: esptool.py --port /dev/ttyUSB0 write_flash 0x8000 partition-table.bin esptoo...