IBM 2790, Manual, Page: 9 / 88

Data Entry Units
The 2795 DEU and the 2796 DEU (designed for ruggedness
and simplicity) are operator-oriented devices for use in a
factory. The 2795 DEU is a small mechanical unit
(approximately 7 inches by 10 inches) containing a badge-
card reader, two 10-position rotary switches, a phone-jack,
an error indicator/reset button, an entry flag, and an entry
request lever, all packaged in a single compact unit for
bench or wall mounting (Figure 3). Wall mounting requires
| a customer-furnished shelf or bracket.
The 2796 DEU contains all the functions of the 2795
DEU plus two additional 10-position rotary switches, four
rocker-thumbwheel switches, and a monitor key(Figure 4).
The DEU is connected to the AS by a customer-furnished
two-wire communications line, and controlled by the AS.
2795 D A T A E N T R Y U N IT
The 2795 DEU includes the following features.
Badge-Card Reader
A badge-card reader located on the top of the DEU reads
ten digits of numeric information punched as shown in
Figure 5.
The badge-card reader can read ten columns of numeric
data from either end of a punched card or ten columns of
numeric data from a 357/1030 style badge. Cards to be
read on a DEU should not have a 9-edge corner cut; a
9-edge corner cut may cause reading problems.
The DEU’s read 0 through 9 punches and blanks. If no
0 through 9 punch is in a data column, the DEU reads that
column as a blank. If a data column is double punched, the
DEU reads the punch closest to the 9-edge and ignores the
other punches in the column.
This numeric information is provided by the following
combinations of punches in a standard 80-column card, or
in the equivalent positions (Figure 5) of an identification
badge.
Entry Flag
Carcf/Badge Slot
Error Indicator/Reset Button
Phone Jack Entry
Request
Lever
Figure 3. IBM 2795 Data Entry Unit
Data Entry Units 9