Sinclair ZX80 / ZX81 / Z88 Forums

https://code.google.com/archive/p/otla/wikis/ProyectoOtla.wiki still works with chrome. Thanks Paul! My browser was blocking some scripts and now is just slightly broken but fully readable and very interesting! Looking at the source I anyway found out that despite the speed it reaches, it is not us...

Moggy wrote: ↑Thu Jan 28, 2021 3:09 pm In his book "Advanced programming for the ZX81" author Mike Costello shows one such method.

The listing 8.3 is the routine to read 1 byte from cassette (c is the byte read)

Seems there is an utility called OTLA able to speed up a lot the "standard" loading! Here is a video showing it working on a ZX81 https://www.youtube.com/watch?v=zDtySKE9nKU&t=1420s PS: I see that it was already mentioned and used here in this forum, but I was trying the mentioned websites but seems...

From article like this one https://retrocomputing.stackexchange.com/questions/1742/why-did-sinclair-choose-the-z80-for-its-range-of-home-computers seem Clive selected Z80 not to invest too much on the video part, but reading other ones (that I found while researching about KIM-1 and video generation...

Not sure if this website can help: https://ws-nbg.de/zx81/main.php

Seems to offer schemas for an external EPROM to run (e.g. the v3.0 seems very simple circuit!)

Forget tapes, my doughter didn't even know what a 3.5" floppy disk was when I showed to her!! (a 3d printed "save icon"?) LOL

Thank you Johan, as usual GREAT content!! I've still to apply it, but I see possibility for few more bytes shaved from the 1K real chess :) I hope that with this jumpstart introduction more people will start developing on the beautiful and challenging bare 1K ZX81 hardware to exploit it to its fulle...

On one of my systems I updated Ubuntu Linux and I think this caused error "zesarux: error while loading shared libraries: libssl.so.1.1: cannot open shared object file: No such file or directory". From what I read on the openssl website (https://www.openssl.org/source/) seems that the 1.1 library is...

Those pages are from 49 Explosive Games for the ZX81 , which also features 28 programs for the 4K ROM ZX80 at the end of the book. Those ZX80 games were originally published in 50 Rip-Roaring Games for the ZX80 and ZX81 . The programs from the book can be found here: 50 Rip-Roaring Games for the ZX...

With 30 minutes and some keypress logic mangement is possible to reproduce Dragon's Lair