Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!rpi!uupsi!sunic!news.funet.fi!cc.tut.fi!cc.tut.fi!mt87692
From: mt87692@lehtori.tut.fi (Mikko Tsokkinen)
Newsgroups: comp.sys.amiga.programmer
Subject: Copper SKIP does not skip WAIT!!!!
Message-ID: <MT87692.91Feb28021402@lehtori.tut.fi>
Date: 28 Feb 91 01:14:02 GMT
Sender: mt87692@cc.tut.fi (Mikko Tsokkinen)
Distribution: comp
Organization: Tampere University of Technology
Lines: 41



 Hello,

 Again I'm programming the copper. From the HRM1.3 page 27:

 The skip intruction causes the Copper to skip the next insruction if video
beam counters are equal to or greater than the value given in the instruction.

Now I was making my copperlist:

Copper2	dc.w	$0001,$8001	; SKIP1 next command allways
	dc.w	$ffff,$fffe	; WAIT1 for frame to end
	dc.w	color,$0fff	; MOVE1 Change bg to white
	dc.w	$ffff,$fffe	; WAIT2 for frame to end

This copperlist should change the bg color to white but it doesn't skip the
WAIT1 instruction.

However this program works fine:

Copper2	dc.w	$0001,$8001	; SKIP1 next command allways
	dc.w	color,$0fff	; MOVE1 change bg to white
	dc.w	$ffff,$fffe	; WAIT1 for frame to end

This copperlist does not change the bg color.

CONCLUSION: SKIP INSTRUCTION SKIPS ONLY MOVE COMMANDS!!!!!!!!!!!

This information is very important to if you are ever making complex
copperlists. Another bug in HRM1.3 (or in the hardware) in two days.

Please someone confirm (from CBM?) is the hardware working wrong or is the
manual wrong or is it just me.

My setup is PAL A2K rev 6.2, 1M CHIP, 8M FAST, A2090, SupraWS, 40MST506 &
Q105LP if that matters.

 MIT

-- 
Bubble Bobble