PDP11 PeripheralsHbk 1972 - Trailing-Edge

BIT
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NAME
Error
Card Done
Card Supply Error
Card Reader Check
Timing Error
Reader To on Line
Busy
Reader Ready Status
Column Date
Reader Interrupt Enable
DESCRI PTION
When set, it indicates that an error has occurred.
When set, indicates that one card has
passed through the read station and another
one may be demanded from the input
hopper. ,
When set indicates that the input hopper
is empty or output stack is full. This signal
is provided by mark sense card readers
only and is not normally available with
punched card units.
Set to indicate abnormal condition in the
card reader. Four conditions can cause
this bit to be set:
a)Feed error
b)Motion error
c)Stack Fail
d)Dark Light Check
These signals are only available from
mark sense readers.
When set it indicates that a new column of
data arrived into the CRB before the previously
loaded column was attended to by
a program.
Indicates that the reader went on-line.
Sensing an error or operating the stop
switch on the card reader panel causes the
reader to go off-line. Operating the start
switch brings the reader on-line providing
no error causing condition exists.
Indicates that a card is being read.
When set, indicates the reader is off line;
o indicates on-line and hence ready to accept
read commands.
Indicates that a column of data is ready in
CRB.
If declared as "1" while loading the status
register, this bit allows the CARD DONE,
COLUMN DONE, or ERROR bit, to cause a
program interrupt.
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