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nec765reg.h revision 1.1 
      1 /*-
      2  * Copyright (c) 1991 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  *	@(#)nec765.h	7.1 (Berkeley) 5/9/91
     34  */
     35 
     36 /*
     37  * Nec 765 floppy disc controller definitions
     38  */
     39 
     40 /* Main status register */
     41 #define NE7_DAB	0x01	/* Diskette drive A is seeking, thus busy */
     42 #define NE7_DBB	0x02	/* Diskette drive B is seeking, thus busy */
     43 #define NE7_CB	0x10	/* Diskette Controller Busy */
     44 #define NE7_NDM	0x20	/* Diskette Controller in Non Dma Mode */
     45 #define NE7_DIO	0x40	/* Diskette Controller Data register I/O */
     46 #define NE7_RQM	0x80	/* Diskette Controller ReQuest for Master */
     47 
     48 /* Status register ST0 */
     49 #define NE7_ST0BITS	"\020\010invld\007abnrml\006seek_cmplt\005drv_chck\004drive_rdy\003top_head"
     50 
     51 /* Status register ST1 */
     52 #define NE7_ST1BITS	"\020\010end_of_cyl\006bad_crc\005data_overrun\003sec_not_fnd\002write_protect\001no_am"
     53 
     54 /* Status register ST2 */
     55 #define NE7_ST2BITS	"\020\007ctrl_mrk\006bad_crc\005wrong_cyl\004scn_eq\003scn_not_fnd\002bad_cyl\001no_dam"
     56 
     57 /* Status register ST3 */
     58 #define NE7_ST3BITS	"\020\010fault\007write_protect\006drdy\005tk0\004two_side\003side_sel\002"
     59 
     60 /* Commands */
     61 #define NE7CMD_SPECIFY	3	/*  specify drive parameters - requires unit
     62 					parameters byte */
     63 #define NE7CMD_SENSED	4	/*  sense drive - requires unit select byte */
     64 #define NE7CMD_WRITE	0xc5	/*  write - requires eight additional bytes */
     65 #define NE7CMD_READ	0xe6	/*  read - requires eight additional bytes */
     66 #define NE7CMD_FORMAT	0x4c	/*  format - requires five additional bytes */
     67 #define NE7CMD_RECAL	7	/*  recalibrate drive - requires
     68 					unit select byte */
     69 #define NE7CMD_SENSEI	8	/*  sense controller interrupt status */
     70 #define NE7CMD_SEEK	15	/*  seek drive - requires unit select byte
     71 					and new cyl byte */
     72