IBM 1620 User Manual

Tape Punch
The tape punch (Figure 3), housed below the tape
reader in the
IS <[ 1621 , punches data from core storage
into paper tape
at the rate of 15 characters per second.
The characters are sent serially from core storage
starting with the location addressed by an
output in-
struction. Each character
i translated to 8-track code
before being punched.
If a character with incorrect parity is transmitted
from core storage and punched, or if a valid character
is incorrectly punched, the tape feed does not advance.
The computer stops in both the automatic and manual
mode; the automatic and manual lights and the punch
no feed
and write check lights on the 1620 console are
turned on. Functions of these lights are described under
o
SOLE. Program processing can be resumed with the
following procedure:
Figure 3. IBM Tape Punch
1. Position t~e tape feed switch ON .
a. The feed code (all punches) is punched over
the incorrect character.
b. The
plillch no feed and write check lights are
turned
off.
c. The machine is returned to manual mode only.
2. Press the start key on the 1620 console.
a. The original character from storage is again
punched.
If an incorrect character still persists,
the record may
be corrected, if desired, before
processing continues.
b. The computer continues processing.
If the tape punch runs out of paper tape, the machine
stops in automatic mode and the punch no feed light
turns on.
Th e "character correction procedure" out-
lined
is used to resume operation.
Appendix B 85

IBM 1620 Specifications

General

Brand	IBM
Model	1620
Category	Desktop
Language	English