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Re: What is the oldest computer that could be used today for real work? [message #410881 is a reply to message #410869] Fri, 10 September 2021 11:54 Go to previous messageGo to previous message
Anonymous
Karma:
Originally posted by: Thomas Koenig

John Levine <johnl@taugh.com> schrieb:
> According to Thomas Koenig <tkoenig@netcologne.de>:
>>> A brand new Z can emulate the 370/145. So can my Raspberry Pi if I
>>> don't expect any performance.
>>
>> Surely, a higher performance than the original? ...
>
> CPU speed, sure, but the point of a mainframe is that it has high performance
> peripherals. A /145 could have up to four channels and could attach several
> dozen disk drives.

The "Functional characteristics" document from 1972 from Bitsavers
gives a maximum rate per channel of 1.85 MB per second with a
word buffer installed, plus somewhat lower figures for four channels
for a total of 5.29 MB/s (which would be optimum).

> These days one SSD holds more data than two dozen 2314 disks, but I wouldn't
> think a Pi has particularly high I/O bandwidth.

A single USB2 port can do around 53 MB/s theoretical maximum, a factor
of approximately 10 vs. the 370/145. I didn't look up the speed
of the Pi's SSD.
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