🚀 go-pugleaf

Has anyone had any experience programming the dma port ? I have build
an interface to use on the port, but I have some problems accessing
it in software. I used the following code segment to access the port:
	{
	short rv;
	short *flock = (short *)0x43e;	   /* flag to disable flpvbl routine */
	short *hdcreg = (short *)0xff8604; /* the fdc/sector count register */
	short *dmareg = (short *)0xff8606; /* dma mode/status register */

		while(!*flock)		/* wait for flock */
			;
		*flock++ ;		/* and set it */

		*dmareg = 0x08;		/* select hdc register with A1 = 0 */
		*hdcreg = 0x00;		/* now write to it */
		rv = *hdcreg;		/* now read from it */

		*flock = 0;		/* enable flpvbl routine */
		return(rv);
	}
When this was run in supervisory mode, there was no activity on the dma port
control signals ( CS R/W* d0-d7 .. ) at all. Although the returned value
did reflect the state on the data lines, for example pulling one low would
reset the coreesponding bit in the returned value.  I have also tried putting
some delays between the reads and writes. Any hints or pointers would be
greatly apreciated.

				Ingo Cyliax
				cyliax@ee.ecn.purdue.edu
				cyliax@ihnp4!pur-ee