TMSCP(4)                                                              TMSCP(4)



NAME
       tmscp - DEC TMSCP magtape interface

SYNOPSIS
       controller tmscp0 at uba? csr 0174500 vector tmscpintr
       tape tms0 at tmscp0 drive 0

DESCRIPTION
       Tape controllers compatible with the DEC Tape Mass Storage Control Pro‐
       tocol (TMSCP) architecture such as the TU81  and  the  TK50  provide  a
       standard  tape drive interface as described in _m_t_i_o(4).  The controller
       communicates with the host through a packet oriented protocol.  Consult
       the file _<vax/tmscp.h_> for a detailed description of this protocol.

DIAGNOSTICS
       tmscp  controller failed to init.  The controller initialization proce‐
       dure failed.  This probably indicates a hardware problem.

       tmscp%d: sa 0%o, state %d.  (Additional status information given  after
       a  hard  I/O  error.)  The values of the controller status register and
       the internal driver state are printed.

       tmscp%d:  random  interrupt  ignored.   An  unexpected  interrupt   was
       received (e.g. when no i/o was pending).  The interrupt is ignored.

       tmscp%d:   interrupt  in  unknown  state  %d ignored.  An interrupt was
       received when the driver was in an unknown internal state.  Indicates a
       hardware problem or a driver bug.

       tmscp%d:  fatal error (0%o).  The controller detected a ‘‘fatal error’’
       in the status returned to the host.  The contents of the status  regis‐
       ter are displayed.

       OFFLINE.  (Additional status information given after a hard I/O error.)
       A hard I/O error occurred because the drive was not on-line.

       The following  errors  are  interpretations  of  TMSCP  error  messages
       returned  by  the  controller  to the host.  Each is preceded by either
       tmscp%d: hard error or tmscp%d: soft error.

       controller error, event 0%o.

       host memory access error, event 0%o, addr 0%o.

       tape transfer error, unit %d, grp 0x%x, event 0%o.

       STI error, unit %d, event 0%o.

       STI Drive Error Log, unit %d, event 0%o.

       STI Formatter Error Log, unit %d, event 0%o.

       unknown error, unit %d, format 0%o, event 0%o.

SEE ALSO
       mt(1), tar(1), tp(1), mtio(4), tm(4), ts(4), ut(4), dmesg(8)



4.3 Berkeley Distribution        June 4, 1986                         TMSCP(4)