3 Jun
2020
3 Jun
'20
12:53 a.m.
On 6/2/20, arnold(a)skeeve.com <arnold(a)skeeve.com> wrote:
Paul Winalski <paul.winalski(a)gmail.com> wrote:
I first encountered DOS/360 on a System/360 model 25 with 48K of
memory. This was a one-job-at-a-time batch system, but the I/O
primitive (EXCP--execute channel program) was asynchronous. So I
don't think the small memory rationale really applies.
-Paul W.
So I'm curious as to what the rationale was
for Unix to have been
designed with basic I/O being blocking rather than asynchronous.
Also, the early Unixs were on smaller -11s, not the /45 or /70 with
split I&D space and the ability to address lost more RAM.