Re: iMac upgradability

[rkidd@uiuc.edu (Robert Kidd)]

In article <judis-1011981400270001@pool-207-205-167-251.nwrk.grid.net>,
judis@mindspring.com (Judi Sohn) wrote:

> In article <B26E3CBD-7777F@195.57.97.239>, "Bennett Rudder" <malk@tnet.es>
> wrote:
> 
> > Also, keep in mind that a USB bus can support 127 devices. And the
> > iMac has two USB buses - so you can add scanners, joysticks, tablets,
> > hard drives, floppies, DVD (soon) . . . etc. Plus USB is hot
> > swappable, so you can plug and unplug devices without powering down or
> > resetting. Now that's plug and play! <<g> It can be daisychained, but
> > works best if you use hubs, which are widely available, average around
> > $70. And try as I might, I can't imagine what I would want more than
> > 254 devices for. <<wink>
> 
> Are you sure about that? You may be right, but it has always been my
> understanding that the iMac has 1 USB bus with 2 ports.Therefore, the
> total devices supported is 127 (not 254), with the first two ports
> available right out of the box. Anything more, and you need a hub and/or
> additional devices. Of course, this point doesn't really matter...as using
> 127 devices at once is just as unrealistic as using 254. ;-)

I think the internal hub in the imac takes one spot, so there's a max of
126 devices.  (at least that's what I have read)

Robert