University of Iowa
Department of Computer Science
Punched cards were, in the 1960's the universal symbol of computing, and
even in the 1930's, they were a symbol of modernity. Today, cards are
all but forgotten, surviving in a few applicatons such as turnpike toll
receipts and automatic voting systems.
Codes used on Punched Cards
There were multiple mappings
between the 12 holes of one card column and the character sets of various
machines and keypunches.
Punched Card Emulation
The following software is available to encourage the development of museum
quality emulators for antique computing and punched-card tabulating
These are supported by a
shared translation table that includes some of the many mappings
between ASCII and hole patterns punched on cards.
The file format used by these programs is
available, and I hope that emulators for historical computer architectures
will support interchangable punched card I/O using this format and that a
suite of emulated punched card data processing machines will be developed.
Other punched card resources