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Path: utzoo!mnetor!seismo!rochester!cornell!batcomputer!braner
From: braner@batcomputer.tn.cornell.edu (braner)
Newsgroups: comp.sys.atari.st
Subject: Problem doing screen dump
Message-ID: <2064@batcomputer.tn.cornell.edu>
Date: Sat, 17-Jan-87 18:32:25 EST
Article-I.D.: batcompu.2064
Posted: Sat Jan 17 18:32:25 1987
Date-Received: Sun, 18-Jan-87 07:37:42 EST
Reply-To: braner@batcomputer.UUCP (braner)
Organization: Theory Center, Cornell University, Ithaca NY
Lines: 35

[]

I'm trying to write a RAM-resident program, activated by the screen-dump
vector at $502, to dump the screen in DEGAS format to a prepared space
in RAM.  Here is the basic code:

	LEA	space(PC),A1
	MOVE.B	0xFF8260,D0	/* video resolution		*/
	ANDI.W	#3,D0
	MOVE.W	D0,(A1)+
	MOVE.L	#0xFF8240,A0	/* palette			*/
	MOVE.W	#15,D0
dopal:	MOVE.W	(A0)+,(A1)+
	DBF	D0,dopal
	CLR.L	D0
	MOVE.B	0xFF8201,D0	/* video address		*/
	LSL.W	#8,D0
	MOVE.B	0xFF8203,D0
	LSL.L	#8,D0
	MOVE.L	D0,A0
	MOVE.W	#15999,D0
domap:	MOVE.W	(A0)+,(A1)+	/* <<<<<<<<<< BIG PROBLEM!!!!!	*/
	DBF	D0,domap

After installing the program, and then pressing Alt-Help (from the desktop),
everything looks OK, until I try to click on something on the desktop:
  BOOM! - fiery crash!

Checks I've done:  The address calculated for A0 IS the screen address,
there IS enough space at 'space', and there is no problem if the 15999
is reduced to, say, 100.

HELP!

- Moshe Braner