IBM Selectric-based Terminals

Paul Berger phb.hfx at
Tue Dec 15 11:42:58 CST 2015

On 2015-12-15 11:27 AM, Paul Koning wrote:
>> 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.
> 	paul
They used a 6 bit code with odd parity so some of the code sheets refer 
to it as a 7 bit code because they include the "C" parity bit.


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