Sinclair ZX80 / ZX81 / Z88 Forums

In a p-file there are some unused bytes that could hold a routine to lower RAMTOP for those programs that need that. Old p files could be upgraded to contain this routine and then you would call it from the BASIC program. Sea Mines needs lower RAMTOP and it might be possible to fix it so that you do...

There is support for exporting a snapshot, but where does it get stored? Is it a p-file (edit: it should be a z81-file)? It also hangs for a long time on my iPhone 8+ when exporting and no file seems to be stored. I have discovered I can export in most cases and it is a .z81 snapshot file that gets...

I use a hacked version of JtyOne that can run other programs, see https://www.sinclairzxworld.com/viewtop ... f=3&t=5387

I have some feature requests and a possible issue for iOS ZX81 app v1.13.3: I have a switch on my ZX81 that inverts the colors, i.e. white becomes black, and vice versa. It would be good to have a similar switch near the screen, because I like dark mode and did so 43 years ago. It also flips colors ...

I think it would be a good thing if EightyOne also was a package on Chocolatey. It would simplify updates and increase the number of users on Windows. They already have e.g. a VIC20 and C64 emulator, WinVice: https://community.chocolatey.org/packages/winvice-nightly They also have a PC emulator, DOS...

You can run my "Aritm - mental calculation" online on https://mobluse.github.io/zx81js/zx81kb.html?track=Aritm.tzx.zip. Aritm has also been published on this site earlier https://www.sinclairzxworld.com/viewtopic.php?f=6&t=4694. The site where it's linked from is on https://mobluse.github.io/zx81js/...

Sea Mines is here: http://www.df.lth.se.orbin.se/~mikaelb/sinclair/zx81/yc/
sea-mines.p
sea-mines.txt
sea-mines.png

There is another, modified, version of Sea Mines here:
https://www.sinclairzxworld.com/viewtop ... 079#p48079

Aritm is short for "aritmetik" i.e. arithmetic in English. Aritm for ZX81 works better if you use the improved ROMs such as "X2": https://sinclairzxworld.com/viewtopic.php?p=40327#p40327 When I ran Aritm for MS-DOS in C (1992) I also had flashbacks to classroom competitions in the 70s which I was no...

CONT in a programme is like a REM I don't agree to that because CONT is like GOTO last executed line unless STOP because then GOTO last executed line +1. In this program you RUN and then press CONT and then SPACE/BREAK key, then CONT again and BREAK etc. You can also try RUN 75 and then press CONT ...

Is there any use for CONT (or CONTINUE for ZX Spectrum) inside a BASIC program? CONT inside programs works different in e.g. ZX81/ZX Spectrum vs VIC20/C64. I know that CONT is useful on the command line. CONT Suppose p/q was the last report with a non-zero. Then CONT has the effect GOTO q if p <> 9,...