20 Jun
2018
20 Jun
'18
11:41 a.m.
On Tue, Jun 19, 2018 at 11:04 PM, Peter Jeremy <peter(a)rulingia.com> wrote:
On 2018-Jun-20 08:55:05 +1000, David Arnold
<davida(a)pobox.com> wrote:
So what could an old mainframe do as far as I/O was concerned? Google
didn't provide me a straight forward answer...
Warner
Does the screen count as I/O?
I was thinking about that as well. 1080p30 video is around 2MBps as H.264
or
about 140MBps as 6bpp raw. The former is negligible, the latter is still
shy
of the disparity in CPU power, especially if you take into account the GPU
power needed to do the decoding.
I’d suggest that it’s just that the balance is
(intentionally) quite
different. If you squint right, a GPU could look like a
channelized I/O
controller.
I agree. Even back then, there was a difference between
commercial-oriented
mainframes (the 1401 and 360/50 lineage - which stressed lots of I/O) and
the
scientific mainframes (709x, 360/85 - which stressed arithmetic
capabilities).