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Article #564Re: DMA port information for DSP and other needs.
From: Dale Luck
Date: Wed, 30 Apr 1986 22:21
Date: Wed, 30 Apr 1986 22:21
31 lines
1525 bytes
1525 bytes
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
Technical Details
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!linus!philabs!prls!pyramid!amiga!dale 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