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Re: What is the oldest computer that could be used today for real work? [message #410893 is a reply to message #410887] Fri, 10 September 2021 18:03 Go to previous messageGo to previous message
John Levine is currently offline  John Levine
Messages: 1405
Registered: December 2011
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According to Scott Lurndal <slp53@pacbell.net>:
>> 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.

That's why there were four channels. Each channel can have a
disk transfer going. An IBM web page said a 2314 could transfer
312L bytes per second so the fastest burst speed would be four
times that, say 1.2M bytes/sec.

I'd think later on people would be more likely to use 3330 or 3340
disks, which were 800K bytes/sec so say total data rate of 3.2MB/sec.

> USB3.0 on a raspberry pi crushes that by orders of magnitude.

Yeah, I would think so. No seek time on your SSD either.

--
Regards,
John Levine, johnl@taugh.com, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. https://jl.ly
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