Re: max IEC bus length and loading?

From: Groepaz <groepaz_at_gmx.net>
Date: Sun, 31 Oct 2010 20:51:19 +0100
Message-Id: <201010312051.19192.groepaz@gmx.net>
On Sonntag 31 Oktober 2010, you wrote:
> On Sun, 31 Oct 2010, Vanessa Ezekowitz wrote:
> > On Sun, 31 Oct 2010 11:57:27 -0700
> > 
> > Nate Lawson <nate@root.org> 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.
> >> 
> >> http://www.root.org/~nate/c64/xum1541/
> >> 
> >> 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).

i remember 4 devices beeing the official specified limit ... no idea where i 
got that number from though :)

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