[TUHS] v7 K&R C

Brantley Coile brantley at coraid.com
Tue May 19 01:51:42 AEST 2020

CDC NOS on the 6600 (I used a 70/74, actually) used 12 bits to store ASCII. Mostly, we used six bit display code. Since there was a printable character for every code, you could just look at the binary files. Ten characters to the word!


> On May 18, 2020, at 11:13 AM, Rich Morin <rdm at cfcl.com> wrote:
>> On May 17, 2020, at 09:24, Paul Winalski <paul.winalski at gmail.com> wrote:
>> ...  The PDP-10 addressed memory in 36-bit units.  The character manipulating
>> instructions could deal with a variety of different byte lengths:  you could
>> store ... five ASCII 7-bit characters (with a bit left over) ...
> IIRC, this format was called 5/7 IOPS ASCII.  The PDP-7, 9, and 15 computers used
> a variant of this format, but they had to start with a pair of (18-bit) words.
> Around 1970, I wrote a pair of (assembly language) routines to extract and insert
> characters, because our PDP-15 did NOT have character manipulating instructions.
> -r

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