IBM Selectric-based Terminals

Paul Koning paulkoning at
Tue Dec 15 09:27:31 CST 2015

> On Dec 15, 2015, at 12:54 AM, Paul Birkel <pbirkel at> wrote:
> ...
> I believe that the Selectric came configured for remote operation, but presumably using an EBCDIC-based data stream.  I vaguely recall a DB-50 connector, but it's been an awfully long time ...
> Does this description sound familiar to anyone?

For a while, RSTS/E supported 2741 terminals, which are Selectric terminals with a UART interface.  It wasn't EBCDIC -- instead, it had one of several possible conversion tables.  I forgot the number of bits per character.  Also, the speed used was peculiar: 134.5 bits per second.  2741 support was dropped at some point; I think V7 has it but it disappeared by V9 if not sooner.


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