Sinclair ZX80 / ZX81 / Z88 Forums

I think you mean this document ?
http://problemkaputt.de/zxdocs.htm

Yep, sort of, anyway that's what i wanted. some more info to read up on, saw the Hires mod that i still would like to do, and in my head i had also come to a quick transfer of progs using a small USR routine and i also came to 4 bits at a time and 1 clock bit, but using the IO port i build and a velleman USB interface , hooking it up where 5 bits are send, and echo-ing the opposite of the clock-bit back to indicate a ready to recieve. velleman has 5 digitial in and 8 digital out, but then it could go both ways, and reside in RAMTOP (or partly at least the function calling the function and retrieving it from EXTMEM Anyway i'll want to modify my Ram extension first and start with simple data copy stuff. I won't actually need to store all system variables, hmm i'll experiment until i get something working right. the idea for behind the storing to EXTMEM is actually more to have a quick save before test running a program so as not to lose work in case of a hang-up.

I didn't explain that right i mean sending 1xxxx for msNibble and then waiting for the echo being 0---- and then sending 0xxxx for the lsN and echo will be 1---- i don't know what the speed will come to, but for sure it's quicker then tape, and i have a velleman USB and experience in using it. and i don't think the timing can really go wrong either way (eg i understood that clock-bit thing, but what if the receiver isn't ready yet ? i actually used a velleman to create a flip-flop chain with 72 data-bits 6-bit at a time, something between a byte and a nibble, i called it a bibble but a nyte could also be a word, 1 clock-bit and a reset-bit.)
I noticed in a USR routine (i think it was a RENUM routine that the routine called a routines from ROM (3751 a 2520) i might want to call some of the standard zx81 basic code, Just to perform a NEW could be nice somehow for instance. There probably is a document describing the whole ROM isn't there ?

Do you mean this?

Complete Timex TS1000/Sinclair ZX81 ROM Disassembly, The
See here

But don't bother trying to down load the book from World of Spectrum, as parts of the site are being reconstructed like the books section.

Instead Download it from this mirror:
http://wos.meulie.net/pub/sinclair/book ... blyThe.pdf
http://wos.meulie.net/pub/sinclair/book ... blyThe.zip

There is also Geoff Wearmouth's site http://www.wearmouth.demon.co.uk which includes ZX Spectrum and ZX81 disassemblies.

Mark

Yeah pretty much that's it. Wow i have so much documentation now that i'll reading for a bit.

Perhaps it is this one ?
https://web.archive.org/web/20081021130 ... zxdocs.txt

Archive.org is magic, you can shift later in time and see if there's another file you need or browse and see what else was published in 2008


About this tool: I totally missed it ! It is absolutely worth to try, I extensively used the Mathias' tool but it is not for beginners

that is actually the same document as in Pokemon's link, but in a txt format. i'll switch back to the other thread for the HiRes RAM Mod.

mcleod_ideafix wrote: ↑Tue Aug 06, 2013 12:28 pm

The last version is available at the following address:
http://www.zxprojects.com/images/storie ... 1putil.zip

Hello,

I try to save an old zx81 game.

I could retreive Argolath (a zx81 french game) but now, I have an old tape with another game but I see a lot of noise/bleed. The ZX81 tape converter bug when I save some bit correction.

Do your soft is still available ? The link is broken.

Thank you for your help !!

Yup,, links are gone does anyone have a copy of this?

A google found this. Maybe it's the one.

https://github.com/mcleod-ideafix/zx81putil