|Photo: IBM 29 Card Punch Reference Manual, A24-3332-1, 1960.|
The alphanumeric ("combination") keyboard layout is shown in this diagram (Click to magnify to full size):
Here's a card punched with each of 64 characters, showing the interpretation across the top:
If you magnify the keyboard diagram or card image, you can see the character
set of the 029, which is similar to ASCII but lacks lowercase letters,
includes two special characters not in ASCII ("not
This is the first version of IBM's EBCDIC (Extended Binary Coded Decimal Interchange Code) character set. Although the repertoire of the 029 card punch is only 64 characters (sufficient to program in Fortran, PL/I, and Cobol), EBCDIC is an 8-bit set with a capacity of 256 characters. As terminals replaced card punches for data entry, lowercase latters, control characters, and other characters were added in the remaining space.
|IBM 029 program drum|
Here's a 1986 view of Columbia's last public keypunch, an 029 model (with a pair of DEC VT101 terminals to its left), in the picturesque SSIO Area:
In 1971, IBM announced its last key punch, the 129, which was an 029 with buffer memory, allowing data to be entered, checked, and edited before committing it to the card; storing up to six different formatting programs (equivalent to program-drum cards); and able to accumulate counts and totals. CLICK HERE for a photo from a 1971 IBM advertisement, and HERE for a higher-resolution (2.5MB) scan of whole ad.
Also see (onsite links):
Offsite Links (checked 6 July 2022):
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|Columbia University Computing History||Frank da Cruz / email@example.com||This page created: January 2001||Last update: 27 August 2022|