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From: dale@amiga.UUCP (Dale Luck)
Newsgroups: net.micro.atari16
Subject: Re: DMA port information for DSP and other needs.
Message-ID: <1065@amiga.amiga.UUCP>
Date: Wed, 30-Apr-86 18:21:07 EDT
Article-I.D.: amiga.1065
Posted: Wed Apr 30 18:21:07 1986
Date-Received: Sat, 3-May-86 04:29:16 EDT
References: <1815@utecfa.UUCP> <274@apollo.mentor.UUCP>
Reply-To: dale@tooter.UUCP (Dale Luck)
Organization: Commodore-Amiga Inc., 983 University Ave #D, Los Gatos CA 95030
Lines: 31

In article <274@apollo.mentor.UUCP> dclemans@mentor.UUCP (Dave Clemans) writes:
>/*	NOTE:								   */
>/*	  The 'asm' command in the 'FIFO_RD()' procedure may be required   */
>/*	  if your compiler uses a 'CLR' to zero a memory location.  The	   */
>/*	  two lines must store a LONG 0 into 'FIFO'.  A 'CLR' (what	   */
>/*	  Megamax compiles the commented out line to) will NOT WORK.	   */
>VOID
>fifo_rd(count)
>WORD	count;
>{
>
>	*fifo = 0x90;
>	*fifo = 0x190;
>	*fifo = 0x90;
>	*diskctl_w = count;
>	*fifo = 0x8a;
>/*	*diskctl_l = 0x0L;    DONT use this -- compiler does it WRONG */
>	asm{
>	move.l	#0x00ff8604,A0
>	move.l	#0x00000000,(A0)
>	}
>}
>		*diskctl_l  = ( (LONG) dma << 21) | (sectno & 0x1f0000) | 0x8a;
Whatever you do is a hack to fix the 68000 clr instruction. But for
those that do not have the asm{} feature you might try:
{
	long qwe;
	qwe = 0;
	*diskctrl_l = qwe;
}
Dale Luck