7 Jan
2019
7 Jan
'19
8:37 a.m.
On 01/06/2019 11:24 PM, Dave Wade via cctalk wrote:
I am also pretty sure that prior to S/360 the term
"character" was generally used for non 8-bit character
machines. I am not familiar with the IBM 70xx series machines
The IBM 7070
(business machine) was a word-addressed
machine, but all decimal.
The IBM 709x series (scientific machine) was also word
addressed, but binary.
I seem to recall that some IBM machines also had
facilities to read all 9 bits from a 9-track tape as data
so 9-bit bytes but I can't find references. I also feel
the use of the term Octet was more marketing to distance
ones machines from IBM..... Dave
The earlier machines were mostly using 7 track
tape, not 9
track. You did have your choice of even or odd parity. I'm
pretty sure that the 360 tape controls did not support any
handling of the 9th track other than parity, and odd parity
was the only option.
Jon