1991/0831/pc/devfloppy.c (diff list | history)

1991/0823/sys/src/9/pc/devfloppy.c:26,34 – 1991/0831/sys/src/9/pc/devfloppy.c:26,37 (short | long | prev | next)
1991/0727		Fseek= 0xf, /* seek cmd */ Fsense= 0x8, /* sense cmd */ Fread= 0x66, /* read cmd */ Fwrite= 0x47, /* write cmd */
1991/0831		Fwrite= 0x45, /* write cmd */
1991/0727		Fmulti= 0x80, /* or'd with Fread or Fwrite for multi-head */
1991/0831		Fchanged= 0x3F7, /* disk changed register */ Fchange= 0x80, /* disk has changed */
1991/0728		DMAchan= 2, /* floppy dma channel */
1991/0727		/* status 0 byte */
1991/0823/sys/src/9/pc/devfloppy.c:281,286 – 1991/0831/sys/src/9/pc/devfloppy.c:284,301
1991/0802		}
1991/0809		/*
1991/0831		* look for a floppy change */ void floppychange(Drive *dp) { if((inb(Fchanged) & Fchange) == 0) return; } /*
1991/0809		* the floppy is so slow, we always read a cylinder * at a time and cache the extra bytes. */
1991/0823/sys/src/9/pc/devfloppy.c:299,304 – 1991/0831/sys/src/9/pc/devfloppy.c:314,320
1991/0802		dp = &floppy.d[c->qid.path & ~Qmask]; switch ((int)(c->qid.path & Qmask)) { case Qdata:
1991/0831		floppychanged(dp);
1991/0809		if(c->offset % dp->t->bytes) errors("bad offset"); if(n % dp->t->bytes)
1991/0823/sys/src/9/pc/devfloppy.c:343,348 – 1991/0831/sys/src/9/pc/devfloppy.c:359,366
1991/0802		dp = &floppy.d[c->qid.path & ~Qmask]; switch ((int)(c->qid.path & Qmask)) { case Qdata:
1991/0831		floppychanged(dp); dp->ccyl = -1;
1991/0802		for(rv = 0; rv < n; rv += i){ i = floppyxfer(dp, Fwrite, aa+rv, c->offset+rv, n-rv); if(i <= 0)