Page 35 of 39
Re: New ZX81 Games
Posted: Mon Nov 06, 2023 4:43 pm
by dr beep
If that ROM uses some sysvar that could be the problem.
I only allow
DFILE
LASTK
FRAMES and
CDFLAG
Rest is used as code
Re: New ZX81 Games
Posted: Mon Nov 06, 2023 7:23 pm
by siggi
Which other of your games uses the same sysvars? I would like to check whether it runs on my ZXNU ..
Re: New ZX81 Games
Posted: Mon Nov 06, 2023 8:36 pm
by dr beep
siggi wrote: ↑Mon Nov 06, 2023 7:23 pm
Which other of your games uses the same sysvars? I would like to check whether it runs on my ZXNU ..
Almost all. You could try CUBICMAZE (page 30), YAHTK (page 30) or LUNAPARK81 (on top of page 33)
Re: New ZX81 Games
Posted: Mon Nov 06, 2023 8:59 pm
by dr beep
Latest version with option to do a CLS
Re: New ZX81 Games
Posted: Mon Nov 06, 2023 9:27 pm
by siggi
Cubimaze works as expedted and does not crash ...
Re: New ZX81 Games
Posted: Tue Nov 07, 2023 8:00 am
by dr beep
siggi wrote: ↑Mon Nov 06, 2023 9:27 pm
Cubimaze works as expedted and does not crash ...
But GOL starts and creates a blanc inverted screen in 2 steps? First leaving corners, the clear corners?
If so then game loads ok. And then pressing a key (latest version NEWLINE/SPACE) gives the cursor?
And THEN setting a colony with Z gives a crash?
Re: New ZX81 Games
Posted: Tue Nov 07, 2023 8:59 am
by siggi
dr beep wrote: ↑Tue Nov 07, 2023 8:00 am
siggi wrote: ↑Mon Nov 06, 2023 9:27 pm
Cubimaze works as expedted and does not crash ...
But GOL starts and creates a blanc inverted screen in 2 steps?
First leaving corners,
Yes
the clear corners?
NO
If so then game loads ok. And then pressing a key (latest version NEWLINE/SPACE) gives the cursor?
And THEN setting a colony with Z gives a crash?
No cursor, no (visible) reaction on any key (except "Z"': crash)
AFAIK the Bigbang rom has a modified "CLS"-routine to clear an expanded screen faster (stores the state of the un/expanded screen in a bit in a system variable).
And the "scroll" routine is modified to not create a compressed line at the bottom of the screen.
Re: New ZX81 Games
Posted: Tue Nov 07, 2023 11:45 am
by dr beep
Well, I don't use CLS from the ROM.
Very weird that not even a cursor appears since that test is only reading LASTK.
So the game does create an inverse screen?
Make video of what happens. Then I can determine where it goes wrong.
Re: New ZX81 Games
Posted: Tue Nov 07, 2023 12:18 pm
by siggi
Re: New ZX81 Games
Posted: Tue Nov 07, 2023 2:05 pm
by dr beep
I see only 1 loop working properly (corners do not erase)
so somehow after the first loop the second is not run.
This is possible if LASTK is somehow effected.
It could be that LASTK is the sysvar used by the ROM.
Can I see the ROM somewhere?