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CPM OPERATING SYSTEMS/CPM 8000 (CPM8K)/P-CP M-Z8K SOURCES/bdos/pktio.h

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+/********************************************************
+*							*
+*		P-CP/M header file 			*
+*    Copyright (c) 1982 by Digital Research, Inc.	*
+*    Structure definitions for doing I/O in packets	*
+*							*
+*    Modified for data in other address space		*
+*							*
+********************************************************/
+
+/* May use this information structure instead of disk parameter header and
+   disk parameter block in future, but for now it's unused
+struct dskinfo
+{
+	UBYTE	*dbuffp;
+	UBYTE	*csv;
+	UBYTE	*alv;
+	UBYTE	blksize;
+	UBYTE	didummy;
+	UWORD	dskmax;
+	UWORD	dirmax;
+	UWORD	chksize;
+};
+			*/
+
+struct iopb
+{
+	UBYTE	iofcn;		/*  function number, see defines below	*/
+	UBYTE	ioflags;	/*  used for login flag and write flag	*/
+	UBYTE	devtype;	/*  device type, see defines below 	*/
+				/*  currently unused			*/
+	UBYTE	devnum;		/*  device number, or, devtype and devnum
+				    taken together form int device number */
+	LONG	devadr;		/*  item nmbr on device to start xfer at */
+		/* note -- item is sector for disks, byte for char devs */
+	UWORD	xferlen;	/*  number items to transfer		*/
+	XADDR	xferadr;	/*  memory address to xfer to/from	*/
+	struct dph *infop;	/*  pointer to disk parameter header	*/
+				/*  return parm for fcn 0, input for rest */
+};
+
+
+/*  Definitions for iofcn, the function number */
+#define	sel_info 0		/*  select and return info on device */
+#define	read	 1
+#define	write    2
+#define	flush    3
+#define	status   4		/* not currently used */
+
+
+/*  Definitions for devtype, the device type */
+/*  This field not currently used	*/
+#define	console	 0
+#define	printer	 1
+#define	disk     2
+#define	memory   3		/* gets TPA boundaries */
+#define	redir    4		/* read/write IOByte   */
+#define	exc_vec	 5		/* set exception vector */
+