Re: max IEC bus length and loading?

From: Gene Buckle <>
Date: Sun, 31 Oct 2010 11:52:00 -0700 (PDT)
Message-ID: <>
On Sun, 31 Oct 2010, Vanessa Ezekowitz wrote:

> On Sun, 31 Oct 2010 11:57:27 -0700
> Nate Lawson <> wrote:
>> We have been doing some robustness testing of the ZoomFloppy board. It
>> uses a 7406 for driving the lines in order to be able to sink a decent
>> amount of current to support multiple IEC devices on the bus.
>> What is the defined worst-case IEC bus configuration that we should
>> support? I'd like a reasonable limit we can support while not adding too
>> much delay for users of one or two drives.
> I'd say 6 devices is reasonable, but if the amount of delay doesn't 
> increase all that quickly with the number of devices you're willing to 
> deal with, go for something that no one in the real world is likely to 
> ever actually exceed - perhaps 8 or so.

Isn't six the max?  Four drives (8,9,10,11) and two printers (4 and 5).


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