On Oct 18, 2005, at 11:30 PM, Robert A. Rosenberg wrote:
--SNIP------------------
And a 2501 which was an Unbuffered Card Reader (unlike the others)
where the card's data was transmitted as it passed the read station. I
had some fun with a 2501 when a shop I was in replaced a 2540 with one
and then found out that there was a set of programs that needed to
read cards punched with both Column Binary and EBCDIC Data Columns at
the same time. With the 2540, the programs would issue a Read Column
Binary/No-Stacker-Select to get the 160 Column Binary Bytes followed
by a Read EBCDIC/Stacker-Select/Data-Check-Off. Since you only got on
crack at the card with the 2501, they had to be read as Column Binary
and then have the EBCDIC columns converted from the internal version
of Card Image to the real internal EBCDIC mappings. This was done with
a sequence of TRs followed by a OC (to overlay rows 12-3 over rows
4-9) and a final TR to do the actual conversion from the Card Punch
Image mapping to Internal mapping. The hardest part was creating the
mapping TR table for that last TR (the other TR Tables were mechanical
and a simple pattern of progressions).
---SNIP----------
Robert,
Congrats.. you are the first person that I have ever heard of that used
column binary. It seems it was a legit reason as well. Here I thought
it was only used by some IBMer that was in a back room.
Ed
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