RDR(nn) - Local Card Reader
The RDR(nn) statement specifies the characteristics of one local card reader. Each reader is defined by a RDR(nn) statement with a unique value (1-99) specified for nn. Use the subscript (nn) in an ascending range (n-*) to indicate from n to 99 or, in a descending range (*-n) to indicate 99 to n, or * to indicate all readers.
The dual reader/punch feature is supported by JES2 as shown in the following
example. Assume that a 3525 with the read feature has a unit address of 013
and that the following two items appear in the JES2 initialization data set:
RDR(2) UNIT=013,START=NO
PUN(1) UNIT=013When JES2 is started, the reader is stopped and the punch feature is activated. If the operator later wishes to read data from the 3525, punch 1 can be stopped and reader 2 started with JES2 operator commands.
Reader characteristics are specified by the following parameters.