Date : Wed, 16 Nov 2005 07:42:14 +1100 (EST)
From : Peter Craven <cjl_craves@...>
Subject: Re:: Master Shadow RAM access?
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Richard
I'm looking at making a M/Code program (that saves screen memory to
sideway RAM) located underneath any BASIC program. The M/Code program
would cater for the possibility that the BASIC program is using SHADOW
mode and the BASIC program extends beyond &3000.
So when the BASIC program calls the M/Code program, I want the code to
save the screen memory to sideways RAM, but not lose the BASIC program.
I guess I am basically asking Is there a direct way of access the SHADOW
RAM without paging the RAM into Main Memory? I just cannot see a way.
Considered using unknown plot commands, but I think this does page the
SHADOW RAM in anyway??
Cheers
Pete
Richard Gellman <splodge@...> wrote:
*FX 108,1
*SRWRITE 3000+5000 8000 4
*FX 108,0
Job's a good'un :)
(obviously do this from a BASIC proggy, else screen corruption, etc.)
-- Richard
Peter Craven wrote:
> Is anyone aware of a way to transfer the Shadow RAM to Sideways RAM
> on the Master other than byte-by-byte access using JSR&C000?
>
> Cheers
>
> Pete
>
>
>
> Dr Peter Craven (MBBS Uni. of Qld)
> 12 Treacher St
> Mt Gravatt
> QLD 4122
> Ph (H): (07) 3349 0820
>
> ------------------------------------------------------------------------
> ____________________________________________________
> ------------------------------------------------------------------------
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>
Dr Peter Craven (MBBS Uni. of Qld)
12 Treacher St
Mt Gravatt
QLD 4122
Ph (H): (07) 3349 0820
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--0-272018777-1132087334=:60509
<div id="RTEContent">Richard<br> <br> I'm looking at making a M/Code
program (that saves screen memory to sideway RAM) located underneath
any BASIC program. The M/Code program would cater for the possibility
that the BASIC program is using SHADOW mode and the BASIC program extends
beyond &3000.<br> <br> So when the BASIC program calls the M/Code
program, I want the code to save the screen memory to sideways RAM, but
not lose the BASIC program.<br> <br> I guess I am basically asking Is
there a direct way of access the SHADOW RAM without paging the RAM into
Main Memory? I just cannot see a way. Considered using unknown plot commands,
but I think this does page the SHADOW RAM in anyway??<br> <br> Cheers<br>
<br> Pete<br><br><b><i>Richard Gellman <splodge@...></i></b>
wrote:<blockquote class="replbq" style="border-left: 2px solid rgb(16,
16, 255); margin-left: 5px; padding-left: 5px;"> <br>*FX 108,1<br>*SRWRITE
3000+5000 8000 4
<br>*FX
108,0<br><br>Job's a good'un :)<br><br>(obviously do this from a BASIC
proggy, else screen corruption, etc.)<br><br>-- Richard<br><br>Peter Craven
wrote:<br><br>> Is anyone aware of a way to transfer the Shadow RAM
to Sideways RAM <br>> on the Master other than byte-by-byte access
using JSR&C000?<br>><br>> Cheers<br>><br>> Pete<br>><br>><br>><br>>
Dr Peter Craven (MBBS Uni. of Qld)<br>> 12 Treacher St<br>> Mt Gravatt<br>>
QLD 4122<br>> Ph (H): (07) 3349 0820<br>><br>> ------------------------------------------------------------------------<br>>
____________________________________________________<br>> ------------------------------------------------------------------------<br>>
Do you Yahoo!?<br>> Never miss an Instant Message - Yahoo! Messenger
for SMS <br>> <http:> <br><br><br><br><br></http:></blockquote><br></div><BR><BR><DIV>Dr
Peter Craven (MBBS Uni. of Qld) <BR>12 Treacher St <BR>Mt Gravatt <BR>QLD 41
22
<BR>Ph (H): (07) 3349 0820</DIV><p>
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