IBM System/370 Operator's Reference Manual page 195

IBM 1403 Printer
Source: SR20-1078 S/360 Operator's Reference Guide
1403
Suggested Restart Procedures for 1403
An 1/0 error causes an interruption condition. When unit check is detected by the
program, sense information sent from the device control unit provides more detailed
infonnation concerning the cause of the unit check. As a result of program analysis of
the sense information, an error message should be made available to the operator to
indicate the condition.
The following information describes the minimum actions that should be performed
when the program detects unit check.
The actions are related to particular sense indications that can occur. These bits are
analyzed by the program. The choice of action(s) to be taken by the operator must be
established at the installation.
Intervention Required (Sense Bit 1)
The printer enters a not·ready condition (Ready light off) because one of the follow·
ing has accurred:
1. The 1403 Stop key is pressed. (Possible operator error).
2. A mechanical interlock, such as the print unit, is open. (Possible operator
error).
3. A forms check. When the Forms-Check light is on, paper feed trouble has
occurred or the Carriage Stop Key has been pressed. (Also, the Ready light
is off). Any jam condition must be corrected and the Check-Reset key must
be pressed before the Start Key is effective. The program should provide an
operator message and exit from this error recovery procedure. The operator
should then perform one of the following:
a. Correct the not-ready condition, accept the record, and allow the
application program to proceed without further retries of the command,
b. Correct the not-ready condition and restart the program from a logical
restart point. The logical restart point should be detenn ined at the
installation and specified to the operator.
4. End of forms. If an end-of-forms has occurred, the End-of-Forms light is on
and the Ready light is off. To reset the printer, press the printer Start Key.
The remaining lines of the form are then printed under program controL
(Note that the Start Key is pressed only once.)
When a hole is then sensed in channel 1 of the carriage tape (either space to or skip
.!Q
or .Qy channel-1), the operation is tenninated with both the End-of-Fonns and
Forms-Check lights on and the Ready light off. Printing does not occur for the line at
which the channel-l hole is sensed. Therefore, a carriage tape with a hole punched in
channel 1. should be on the carriage. If there is no hole in channel 1, printing contin-
ues even if no forms are in the printer (except for Selective Tape Listing operations).
If no skip-to-channel-1 command is issued, lines are printed (after the last fonn) until
the channel-1 punch is sensed. (For Selective Tape Listing operation, new tapes should
be mounted when the end-of-forms indication occurs.)
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