On Sat, 7 Mar 2020 20:51:39 -0000 (UTC), Martin Gregorie
 declaimed the following:


>There was almost no commonality between the 2900 and the S/360 S/370
>apart from the decidedly odd decision to use EDCDIC character codes.
>

 EBCDIC had the advantage of mapping practically 1:1 with Hollerith card
codes. EBCDIC and ASCII were both released with a year of each other, and
since IBM already had equipment using "BCDIC" (no "extended") it likely was
faster for them to develop and release EBCDIC than to wait for the ASCII
standard, and only then develop systems using it.


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