1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)nec765.h 8.1 (Berkeley) 06/11/93 8 */ 9 10 /* 11 * Nec 765 floppy disc controller definitions 12 */ 13 14 /* Main status register */ 15 #define NE7_DAB 0x01 /* Diskette drive A is seeking, thus busy */ 16 #define NE7_DBB 0x02 /* Diskette drive B is seeking, thus busy */ 17 #define NE7_CB 0x10 /* Diskette Controller Busy */ 18 #define NE7_NDM 0x20 /* Diskette Controller in Non Dma Mode */ 19 #define NE7_DIO 0x40 /* Diskette Controller Data register I/O */ 20 #define NE7_RQM 0x80 /* Diskette Controller ReQuest for Master */ 21 22 /* Status register ST0 */ 23 #define NE7_ST0BITS "\020\010invalid\007abnormal\006seek complete\005drive check\004drive_rdy\003top head\002unit_sel1\001unit_sel0" 24 25 /* Status register ST1 */ 26 #define NE7_ST1BITS "\020\010end_of_cyl\006bad_crc\005data_overrun\003sec_not_fnd\002write_protect\001no_am" 27 28 /* Status register ST2 */ 29 #define NE7_ST2BITS "\020\007control_mark\006bad_crc\005wrong_cyl\004scan_equal\003scan_not_found\002bad_cyl\001no_dam" 30 31 /* Status register ST3 */ 32 #define NE7_ST3BITS "\020\010fault\007write_protect\006drdy\005tk0\004two_side\003side_sel\002unit_sel1\0012unit_sel0" 33 34 /* Commands */ 35 #define NE7CMD_SENSED 2 /* sense drive - requires unit select byte */ 36 #define NE7CMD_SPECIFY 3 /* specify drive parameters - requires unit 37 parameters byte */ 38 #define NE7CMD_WRITE 5 /* write - requires eight additional bytes */ 39 #define NE7CMD_READ 6 /* read - requires eight additional bytes */ 40 #define NE7CMD_RECAL 7 /* recalibrate drive - requires 41 unit select byte */ 42 #define NE7CMD_SENSEI 8 /* sense controller interrupt status */ 43 #define NE7CMD_SEEK 15 /* seek drive - requires unit select byte 44 and new cyl byte */ 45