GE 235 System Manual page 50

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GE-235 PUNCHED CARD EQUIPMENT
The GE-235 information processing system features two types of card readers and two types of
card punch units with which to process tabulating cards.
CARD READERS
400 CARD P E R MINUTE UNIT
1000 CARD
PER
MINUTE UNIT
Punched cards may be read in decimal (Hollerith), 10-row binary, and 12-row binary
modes.
Card readers can operate simultaneously with central processor computation and other
input/output operations.
Cards a r e read serially, column by column, by photocells, providing reliable and
accurate card reading in either continuous o r demand type operations.
Intermixed Hollerith and 12-row binary coded cards can be read by detecting a 7-9 punch
in column one of binary cards.