sys/h/htreg.h

/*      htreg.h 4.1     81/03/21        */

struct  htdevice
{
        int     htcs1;          /* control status register */
        int     htds;           /* drive status register */
        int     hter;           /* error register */
        int     htmr;           /* maintenance register */
        int     htas;           /* attention status register */
        int     htfc;           /* frame counter */
        int     htdt;           /* drive type register */
        int     htck;           /* nrzi check (crc) error character */
        int     htsn;           /* serial number register */
        int     httc;           /* tape controll register */
};

/* htcs1 */
#define HT_GO           000001          /* go bit */
#define HT_SENSE        000000          /* no operations (sense) */
#define HT_REWOFFL      000002          /* rewind offline */
#define HT_REW          000006          /* rewind */
#define HT_DCLR         000010          /* drive clear */
#define HT_RIP          000020          /* read in preset */
#define HT_ERASE        000024          /* erase */
#define HT_WEOF         000026          /* write tape mark */
#define HT_SFORW        000030          /* space forward */
#define HT_SREV         000032          /* space reverse */
#define HT_WCHFWD       000050          /* write check forward */
#define HT_WCHREV       000056          /* write check reverse */
#define HT_WCOM         000060          /* write forward */
#define HT_RCOM         000070          /* read forward */
#define HT_RREV         000076          /* read reverse */

/* htds */
#define HTDS_ATA        0100000         /* attention active */
#define HTDS_ERR        0040000         /* composite error */
#define HTDS_PIP        0020000         /* positioning in progress */
#define HTDS_MOL        0010000         /* medium on line */
#define HTDS_WRL        0004000         /* write lock */
#define HTDS_EOT        0002000         /* end of tape */
/* bit 9 is unused */
#define HTDS_DPR        0000400         /* drive present (always 1) */
#define HTDS_DRY        0000200         /* drive ready */
#define HTDS_SSC        0000100         /* slave status change */
#define HTDS_PES        0000040         /* phase-encoded status */
#define HTDS_SDWN       0000020         /* settle down */
#define HTDS_IDB        0000010         /* identification burst */
#define HTDS_TM         0000004         /* tape mark */
#define HTDS_BOT        0000002         /* beginning of tape */
#define HTDS_SLA        0000001         /* slave attention */

#define HTDS_BITS \
"\10\20ATA\17ERR\16PIP\15MOL\14WRL\13EOT\11DPR\10DRY\
\7SSC\6PES\5SDWN\4IDB\3TM\2BOT\1SLA"

/* hter */
#define HTER_CORCRC     0100000         /* correctible data or ecc */
#define HTER_UNS        0040000         /* unsafe */
#define HTER_OPI        0020000         /* operation incomplete */
#define HTER_DTE        0010000         /* drive timing error */
#define HTER_NEF        0004000         /* non-executable function */
#define HTER_CSITM      0002000         /* correctable skew/illegal tape mark */
#define HTER_FCE        0001000         /* frame count error */
#define HTER_NSG        0000400         /* non-standard gap */
#define HTER_PEFLRC     0000200         /* format error or lrc error */
#define HTER_INCVPE     0000100         /* incorrectable data error or vertical
                                           parity error */
#define HTER_DPAR       0000040         /* data parity error */
#define HTER_FMT        0000020         /* format error */
#define HTER_CPAR       0000010         /* control bus parity error */
#define HTER_RMR        0000004         /* register modification refused */
#define HTER_ILR        0000002         /* illegal register */
#define HTER_ILF        0000001         /* illegal function */

#define HTER_BITS \
"\10\20CORCRC\17UNS\16OPI\15DTE\14NEF\13CSITM\12FCE\11NSG\10PEFLRC\
\7INCVPE\6DPAR\5FMT\4CPAR\3RMR\2ILR\1ILF"
#define HTER_HARD \
        (HTER_UNS|HTER_OPI|HTER_NEF|HTER_DPAR|HTER_FMT|HTER_CPAR| \
        HTER_RMR|HTER_ILR|HTER_ILF)

/* htdt */
#define HTDT_NSA        0100000         /* not sector addressed; always 1 */
#define HTDT_TAP        0040000         /* tape; always 1 */
#define HTDT_MOH        0020000         /* moving head; always 0 */
#define HTDT_7CH        0010000         /* 7 channel; always 0 */
#define HTDT_DRQ        0004000         /* drive requested; always 0 */
#define HTDT_SPR        0002000         /* slave present */
/* bit 9 is spare */
/* bits 8-0 are formatter/transport type */

/* httc */
#define HTTC_ACCL       0100000         /* transport is not reading/writing */
#define HTTC_FCS        0040000         /* frame count status */
#define HTTC_SAC        0020000         /* slave address change */
#define HTTC_EAODTE     0010000         /* enable abort on data xfer errors */
/* bits 8-10 are density select */
#define HTTC_800BPI     0001400         /* in bits 8-10, dens=1600 */
#define HTTC_1600BPI    0002000         /* in bits 8-10, dens=800 */
/* bits 4-7 are format select */
#define HTTC_PDP11      0000300         /* in bits 4-7, pdp11 normal format */
#define HTTC_EVEN       0000010         /* select even parity */
/* bits 0 - 2 are slave select */

#define b_repcnt  b_bcount
#define b_command b_resid