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From: bruce@stride.UUCP (Bruce Robertson)
Newsgroups: net.arch,net.micro.68k
Subject: Re: 68k dbcc
Message-ID: <571@stride.UUCP>
Date: Sun, 13-Apr-86 23:16:57 EST
Article-I.D.: stride.571
Posted: Sun Apr 13 23:16:57 1986
Date-Received: Fri, 18-Apr-86 08:44:00 EST
References: <1511@decwrl.DEC.COM> <5100028@ccvaxa>
Reply-To: bruce@stride.UUCP (Bruce Robertson)
Organization: Stride Micro, Reno, NV
Lines: 17
Xref: watmath net.arch:3091 net.micro.68k:1628

> but you can't poll an I/O device's busy bit
> 	M:	btst #3,a0@
> 	dbeq	d7,M
> and still remain within the cache.

	The btst instruction above is a 32-bit instruction, since the
immediate value takes a whole 16 bit word.  What you really want to
do is:

	moveq	#3,d0
M:	btst	d0,a0@
	dbeq	d7,M
-- 

	Bruce Robertson
	UUCP: cbosgd!utah-cs!utah-gr!stride!bruce
	ARPA: stride!bruce@utah-gr.arpa