ICL 1901 A
IBM's last tabulator last unitrecord punch card machine See Msg body
I was in the last clbutt in the USAF to be trained on the 407. Our final included an interface with a 513 Summary Punch. IBM was still making the 029 & 059 punches...
I have noticed that in TP4999-1, there is one page in the table of contents which seems to have a problem; the page appears, then a later page comes up over it.
A practical use for old system emulators
I responded to a request for help on data formats used on ICL 1900 systems by the Population Studies Centre, University of Pennsylvania for The problem...
But, in any case, it is a fascinating document.
However could I have gotten through life without knowing that the zone punches are in the *upper curtate* of a punched card, and the numeric punches are in the *lower curtate* of the same card?
(For this purpose, the 0 punch is considered a zone punch. Why the 8 and 9 punches didn't have a third curtate of their own is another question.)
I am suitably amazed by one punched-card characteristic of the ICL 1900. It may well have been the only machine to ever offer support for both the 80-column punched card and the 90-column punched card - not counting Univac machines coming from an architecture that had 90-column punched cards, to which the option of 80-column cards was then added, of course. On this side of the Atlantic, the Univac market was apparently far too tiny for anyone else to make even the slightest effort at nibbling at it.
And I will eventually correct the name of ICL in my diagram...
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