Re: Wanted: a faster protocol for IEEE devices

Date: Tue, 17 Sep 2013 20:02:01 -0700
Message-ID: <>
On 2013/09/17 7:02 pm, Julian Perry wrote:
[Jim Brain wrote, attribution did not survive:]
>> d82 was created from 8250 disk in 12 minutes.
> That's quite respectable, considering it's shovelling a meg of data.

I'm not sure I agree with that. That's not even 1.5 KB/s. Considering 
the IEEE-488 bus is capable of over 1MB/s with a faster machine driving 
it, I have to say I'm a little underwhelmed.

Anyone have any ideas as to how much of the sluggishness is due to the 
ancient and slow floppy drive mechanism? Of course, a good bit would 
have to be due to the inadequate buffering capacity, as well. Not sure 
about the 8250 without looking it up, but I seem to recall the 2040/4040 
only has a couple of KiB on board. Those RAM chips cost a lot in the 
late 1970s.


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Received on 2013-09-18 04:00:08

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