OpenSpand announcement

[nollkolltroll]

Mustermann: yes you are correct, unfortunately both Minstrel 2 & 3 resist key-data injection. I will test your diode-pullups and hope it works. It is too good a feature to have it not working!

[siggi]

Is it possible to switch over from one rom to another one without doing a reset?
E. g. to LOAD a program using Zxpand rom, then switch to ZX81 rom to LLIST the program on printer (because ZxPand rom does not contain printer code)?

Siggi

[Paul]

Is it possible to switch over from one rom to another one without doing a reset?
E. g. to LOAD a program using Zxpand rom, then switch to ZX81 rom to LLIST the program on printer (because ZxPand rom does not contain printer code)?

Siggi

Just load the program LOAD "PROG;X"
Which deactivates the ZXPand ROM after loading.
Works on any ZXPand in the wild as well as in emulators

[Paul]

There might be other solutions in the future which we don't discuss until finalized.
Anyway, ideas and questions are always welcome

[siggi]

Is it possible to switch over from one rom to another one without doing a reset?
E. g. to LOAD a program using Zxpand rom, then switch to ZX81 rom to LLIST the program on printer (because ZxPand rom does not contain printer code)?

Siggi

Just load the program LOAD "PROG;X"
Which deactivates the ZXPand ROM after loading.
Works on any ZXPand in the wild as well as in emulators

Yes, but there is no way back to ZxPand-rom except doing a reset ....

[siggi]

There might be other solutions in the future which we don't discuss until finalized.
Anyway, ideas and questions are always welcome

There are other solutions like POKE 8, something or POKE 0, something...

[Moggy]

Is it possible to switch over from one rom to another one without doing a reset?
E. g. to LOAD a program using Zxpand rom, then switch to ZX81 rom to LLIST the program on printer (because ZxPand rom does not contain printer code)?

Siggi

Just load the program LOAD "PROG;X"
Which deactivates the ZXPand ROM after loading.
Works on any ZXPand in the wild as well as in emulators

Yes, but there is no way back to ZxPand-rom except doing a reset ....

Charlie posted this as a way to get back into the overlay ROM but it was for very early firmware I'm not sure if it works with up to date firmware or the ZXpand+.

Code: Select all

re-enable the overlay
ld bc,$e007
ld a,$b1
out (c),a

The thread can be found here....

https://www.sinclairzxworld.com/viewtop ... ter+module

[nollkolltroll]

The hard part about going back to expanded rom will be to decide HOW to do it from basic... Doing it in asm or via configuration will work easily.
Maybe poke a magic number to rom area?

[nollkolltroll]

Code: Select all

re-enable the overlay
ld bc,$e007
ld a,$b1
out (c),a

Had to take a look. That is implemented in OpenSpand, just as in ZXpand+ Tomte rom source. Set a=$b1 to switch to OpenSpand rom, set a=$b0 to switch to ZX81 rom. So not possible from BASIC, but no problem in asm.

[Moggy]

A small BASIC and M/C program to relaunch the Spand back into overlay mode then launch ZXpand commander

Should you not use commander then just delete the RAND USR 0 line.

This works well enough on the spand+ and whilst it works on the older spands it shows an error ( B/10 ) so never gets to line 20 (RAND USR 0 ), quite why it does this I have no idea but at least it re-launches the overlay without having to pull the plug.