On Tue, 15 Jun 1999, Adriano Camargo Rodrigues da Cunha wrote:
>
> Jon,
>
> > Slotswitching routines (like #001C) in MSXDOS1 destroy the IY register.
> > That explains everything.
>
> Nice. But it raises two questions:
> a) What if IY is destroyed? It's only used by #001C, not by the
> subrom routine;
oops; indeed IY is required by the #001C routine itself;
but I remember -last summer- when I was busy with Compass #2.0 (be patient
people :) ) I had a same sort of bug when setting the palette through the
subrom. Everything worked fine (in DOS2), but when I tested the whole
thing in DOS1 it crashed. After many hours of searching for the bug, it
was something with the IY register... I will look it up in my docs...
jon
> b) This crash also happens with DOS2 in my MSX; :(
>
> > possible solution: page the subrom in with #0024 en call the routine
> > directly.
>
> Nice idea... I didn't try it... Thanks!
>
>
> Adriano Camargo Rodrigues da Cunha ([EMAIL PROTECTED])
> Engenharia de Computacao - UNICAMP
> http://www.adrpage.cjb.net MSX-TR:I have one.And you?
>
> * ----->8----- Don't cut here or you'll destroy your monitor! ----->8----- *
>
>
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