CR(4)               UNIX Programmer's Manual                CR(4)



NAME
     cr - card reader

DESCRIPTION
     The file /d_e_v_/c_r_ accesses our Documation M200 card reader,
     interfaced with an MDB controller.

     It presently supports only cards containing text (i.e. no
     binary cards).  As each card is read, trailing blanks are
     stripped off and a trailing newline is added.

     The read routine returns error code ENXIO in case of pick
     check, hopper check, or read check, which require that the
     last 0, 1, and 2 cards, respectively, be reread.  EIO is
     returned for serious errors, such as timing error.

FILES
     /dev/cr

SEE ALSO
     crdaemon(8)

BUGS
     Possibly.  Occasionally gets stuck (lost interrupt?), not
     known whether problem is sick hardware or driver bug.

HEP INFO
     Has funny kludge (vestige of old RJE system) which turns 789
     punch into ``~7'' and 6789 punch into ``~f''.  This should
     probably be removed.

     Written by Mark Bartelt, based on earlier version by Larry
     White.






















Printed 6/15/82                HEP                              1