[TUHS] core

Warner Losh imp at bsdimp.com
Wed Jun 20 15:41:41 AEST 2018

On Tue, Jun 19, 2018 at 11:04 PM, Peter Jeremy <peter at rulingia.com> wrote:

> On 2018-Jun-20 08:55:05 +1000, David Arnold <davida at pobox.com> wrote:
> >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).

So what could an old mainframe do as far as I/O was concerned? Google
didn't provide me a straight forward answer...

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