+/* mtreg.h 4.1 81/11/11 */
+
+struct mtdevice {
+ int mtcs; /* control status register */
+ int mter; /* error register */
+ int mtca; /* command address, rec cnt, skp cnt reg */
+ int mtmr1; /* maintenance register */
+ int mtas; /* attention summary register */
+ int mtbc; /* byte count register */
+ int mtdt; /* drive type register */
+ int mtds; /* drive status register */
+ int mtsn; /* serial number register */
+ int mtmr2; /* maintenance register */
+ int mtmr3; /* maintenance register */
+ int mtner; /* non-data transfer error register */
+ int mtncs[4]; /* non-data transfer command registers */
+ int mtia; /* internal address */
+ int mtid; /* internal data */
+};
+
+/* mtcs */
+#define MT_GO 000001 /* go bit */
+#define MT_NOOP 000002 /* no operation */
+#define MT_UNLOAD 000004 /* unload tape */
+#define MT_REW 000006 /* rewind */
+#define MT_SENSE 000010 /* sense */
+#define MT_DSE 000012 /* data security erase */
+#define MT_WTMPE 000014 /* write phase encoded tape mark */
+#define MT_WTM MT_WTMPE /* generic write tape mark */
+#define MT_WTMGCR 000016 /* write GCR tape mark */
+#define MT_SFORW 000020 /* space forward record */
+#define MT_SREV 000022 /* space reverse record */
+#define MT_SFORWF 000024 /* space forward file */
+#define MT_SREVF 000026 /* space reverse file */
+#define MT_SFORWE 000030 /* space forward either */
+#define MT_SREVE 000032 /* space reverse either */
+#define MT_ERGPE 000034 /* erase tape, set PE */
+#define MT_ERASE MT_ERGPE /* generic erase tape */
+#define MT_ERGGCR 000036 /* erase tape, set GCR */
+#define MT_CLSPE 000040 /* close file PE */
+#define MT_CLS MT_CLSPE /* generic close file */
+#define MT_CLSGCR 000042 /* close file GCR */
+#define MT_SLEOT 000044 /* space to logical EOT */
+#define MT_SFLEOT 000046 /* space forward file, stop on LEOT */
+#define MT_WCHFWD 000050 /* write check forward */
+#define MT_WCHREV 000056 /* write check reverse */
+#define MT_WRITEPE 000060 /* write phase encoded */
+#define MT_WRITE MT_WRITEPE /* generic write */
+#define MT_WRITEGCR 000062 /* write group coded */
+#define MT_READ 000070 /* read forward */
+#define MT_EXSNS 000072 /* read extended sense error log */
+#define MT_READREV 000076 /* read reverse */
+#define MT_GCR 000002 /* make generic ops GCR ops */
+
+/* mtds */
+#define MTDS_RDY 0100000 /* tape ready */
+#define MTDS_PRES 0040000 /* tape unit has power */
+#define MTDS_ONL 0020000 /* online */
+#define MTDS_REW 0010000 /* tape rewinding */
+#define MTDS_PE 0004000 /* tape set for phase encoded */
+#define MTDS_BOT 0002000 /* tape at BOT */
+#define MTDS_EOT 0001000 /* tape at EOT */
+#define MTDS_FPT 0000400 /* write protected */
+#define MTDS_AVAIL 0000200 /* unit available */
+#define MTDS_SHR 0000100 /* unit is shared */
+#define MTDS_MAINT 0000040 /* maintenance mode */
+#define MTDS_DSE 0000020 /* DSE in progress */
+
+#define MTDS_BITS \
+"\10\20RDY\17PRES\16ONL\15REW\14PE\13BOT\12EOT\11FPT\10AVAIL\
+\7SHR\6MAINT\5DSE"
+
+/* mter */
+#define MTER_INTCODE 0377 /* mask for interrupt code */
+
+/* interrupt codes */
+#define MTER_DONE 001 /* operation complete */
+#define MTER_TM 002 /* unexpected tape mark */
+#define MTER_BOT 003 /* unexpected BOT detected */
+#define MTER_EOT 004 /* tape positioned beyond EOT */
+#define MTER_LEOT 005 /* unexpected LEOT detected */
+#define MTER_NOOP 006 /* no-op completed */
+#define MTER_RWDING 007 /* rewinding */
+#define MTER_FPT 010 /* write protect error */
+#define MTER_NOTRDY 011 /* not ready */
+#define MTER_NOTAVL 012 /* not available */
+#define MTER_OFFLINE 013 /* offline */
+#define MTER_NONEX 014 /* unit does not exist */
+#define MTER_NOTCAP 015 /* not capable */
+#define MTER_ONLINE 017 /* tape came online */
+#define MTER_LONGREC 020 /* long tape record */
+#define MTER_SHRTREC 021 /* short tape record */
+#define MTER_RETRY 022 /* retry */
+#define MTER_RDOPP 023 /* read opposite */
+#define MTER_UNREAD 024 /* unreadable */
+#define MTER_ERROR 025 /* error */
+#define MTER_EOTERR 026 /* EOT error */
+#define MTER_BADTAPE 027 /* tape position lost */
+#define MTER_TMFLTA 030 /* TM fault A */
+#define MTER_TUFLTA 031 /* TU fault A */
+#define MTER_TMFLTB 032 /* TM fault B */
+#define MTER_MBFLT 034 /* Massbus fault */
+#define MTER_KEYFAIL 077 /* keypad entry error */
+
+/* mtdt */
+#define MTDT_NSA 0100000 /* not sector addressed; always 1 */
+#define MTDT_TAP 0040000 /* tape; always 1 */
+#define MTDT_MOH 0020000 /* moving head; always 0 */
+#define MTDT_7CH 0010000 /* 7 channel; always 0 */
+#define MTDT_DRQ 0004000 /* drive request required */
+#define MTDT_SPR 0002000 /* slave present; always 1 ??? */
+/* bit 9 is spare */
+/* bits 8-0 are formatter/transport type */
+
+/* mtid */
+#define MTID_RDY 0100000 /* controller ready */
+#define MTID_CLR 0040000 /* controller clear */
+
+#define b_repcnt b_bcount
+#define b_command b_resid
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