On Mon, 11 Nov 2019, Clem Cole wrote:
According to my friend Russ Robulen (his coworker,
lead on the 360/50,
worked on /91 and later lead for the IBM ASC), Amdahl wanted the byte
to be 7-bits for S/360, but Fred Brook's overruled him. Brooks was said
to have thrown Amdahl out his office and told him "not come back unless
it was a power of 2", as "he could not program it sanely otherwise."
Amdahl semi-won the 24/32 bit war. Brooks let he have a 24 bit basic
word, only if it stored it as 32 bits and ensured that all pointers were
stored in the same. Russ says that Amdahl always thought both choices
were a terrible waste of hardware. Gordon Bell later said, those two
choices were the most important in S/360's lasting impact.
Interesting; I'll try and summarise that for my calendar. In the meantime
I'm glad that Brooks' view prevailed, having worked with byte-less 12-bit
(PDP-8) and 60-bit (CDC); I don't remember the word length of the
Burroughs series.
-- Dave