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Re: What is the oldest computer that could be used today for real work? [message #410903 is a reply to message #410887] Sat, 11 September 2021 02:42 Go to previous messageGo to previous message
Anonymous
Karma:
Originally posted by: maus

On 2021-09-10, Scott Lurndal <scott@slp53.sl.home> wrote:
> Thomas Koenig <tkoenig@netcologne.de> writes:
>> 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).
>
> But it is unlikely that a single drive was dense enough to drive
> anywhere near that rate. Regardless of the channel speed, the
> drive is limited by how fast it can get the data off the platter.
>
>
> The fastest NVME SSDs can read three GByte/second and write one Gbyte/second.
>
> The fastest USB SSDs are limited to 600MByte/sec, but few can reach that speed.
>
> As NVME simply requires a PCI express port, which is available on many raspberry
> pi boards, the max I/O speed for a pi is the speed of a single PCI Express Gen 3
> (1GByte/s) or Gen 4 (2Gbytes/s) lane depending on the pi. Might even see
> Gen 5 in the next couple of years (4Gbytes/sec) in future Pi processors.


I have several Pi's, and only in the last have I found what I think is
a grievious error, installed heat sinks, turned it on. After a few
minutes I noticed a searing pain where my hand was leaning on one of
the heat sinks.

greymausg@mail.com
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