[COFF] In memoriam: Gene Amdahl
Dave Horsfall
dave at horsfall.org
Tue Nov 12 07:38:02 AEST 2019
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
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