Date   : Wed, 01 Aug 2012 12:43:29 +0100
From   : jgh@... (J.G.Harston)
Subject: Screen saving

Tom Pen wrote:
> Is it possible to save the screen on a Master as it was on the model 
> B

You mean *Save screen FFFF3000+5000  ? Exactly the same
as on a BBC model B to save a non-shadow MODE 0/1/2 screen.
Shadow screen memory is at &FFFExxxx, and we had a discussion
here about a year ago about how to transparently always save
the displayed screen on whatever machine is running by
switching in the shadow screen if it is present:
http://mdfs.net/Archive/BBCMicro/2011/04/30/192404.htm

DEFPROCscnsave(A$)
A%=FNfx(108,1):OSCLI "SAVE "+A$+" FFFE3000+5000":A%=FNfx(108,0)
ENDPROC
:
DEFFNfx(A%,X%):LOCAL Y%:Y%=X%DIV256:=((USR&FFF4)AND&FFFF00)DIV256
:
DEFFNerr:A%=FNfx(108,0)
REM Continue error handler

-- 
J.G.Harston - jgh@...      - mdfs.net