[A83] Re: What the heck is RST???
[Prev][Next][Index][Thread]
[A83] Re: What the heck is RST???
Well, then, it would be an idea to include some of the rom routines
into the program, are the _vputs, _ipoint, and _dispop1a routines
found somewhere, or should I use VTI to find them out?
--Peter-Martijn
> You can't use *any* system RAM (that includes flags, OP registers, graph
> buffer, saveSScreen, appBackUpScreen, etc) while you have the page swapped,
> and you can't use any ROM routine that would use system RAM (additionally,
> TIOS checks to make sure a RAM page is loaded in port 7 in some places).
>
> And yes, for restoring the page, you can get the current page that's there
> with "in a,(7)", save that value, and output it to port 7 after you're
> through.
>
> -Dan Englender
>
>
> > -----Original Message-----
> > From: assembly-83-bounce@lists.ticalc.org
> > [mailto:assembly-83-bounce@lists.ticalc.org]On Behalf Of Hyperbyte
> > Sent: Saturday, July 07, 2001 2:27 PM
> > To: assembly-83@lists.ticalc.org
> > Subject: [A83] Re: What the heck is RST???
> >
> >
> >
> > Are there any implications to doin so?
> > Since 8000h+ is normally used by flags and so, I assume they can't be used
> > directly.
> > Also, how do I get the ram page back.
> > (I assume "in a,(07h)"
> >
> > is this correct to modify the pointers read from the VAT:
> >
> > hl contains the location in the 4000h range...
> >
> > res 6,h
> > set 7,h
> >
> > ld a,(hl)
> > ...
> >
> > It would be a whole lot faster than ld[a|c]indpaged'ing
> >
> > --Peter-Martijn
> >
> >
> >
>
>
>
Follow-Ups:
References: