NYYRIKKI wrote:
> I know, that I have only questions, that nobody can answer, but I'm trying
> my luck once again...
Yes, I found a bug on this code.
The PUSH/POP instructions save/restore the register A
on RAM. Using D/E registers for save PPI Slot status, the
problem is solved.
> IN A,(#A8)
> PUSH AF ; use LD D,A
> LD A,(#FFFF)
> CPL
> PUSH AF ; use LD E,A
> LD A,XXX
> OUT (#A8),A
> LD A,YYY
> LD (#FFFF),A
> .
> .
> .
> POP AF ; use LD A,E
> LD (#FFFF),A
> POP AF ; use LD A,D
> OUT (#A8),A
If your program crashed with these corrections, or your
MSX is turbo, use delays instructions before OUTS and
LDs on address #FFFF , like NOPs.
Regards from Brazil,
MARUJO.
_______________ _ _ _______________ _______________________
| | |_| |_ __ _ __ | WALTER BERNARDO NUNES |
| /|| |_ _| \| |/ / | [EMAIL PROTECTED] |
\ / || | | | _| / / Graduacao Fisica-UFRGS |
\ / || |_| |_ |_| | /__________________________|
\__/______||___|___|___|_|_ / MSX: ainda estou nessa.
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