Re: Apple II II+ Mountain Comp Expansion Chassis

[David Wilson <david@uow.edu.au>]

"Michael Pender" <mpender@hotmail.com> writes:

>Ernest <leucoplast@seanet.NOSPAM.com> wrote in message
>news:1I4Sa.81664$OZ2.15121@rwcrnsc54...
>> Now THIS is coool!
>>
>>
>http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2743105161&category=4610
>>
>From the advertisement:
>> It is the ONLY 8 slot chassis ever made for the Apple II, and the ONLY
>chassis where ALL the cards in the
>> chassis are acticve simultaneously, NOT just the 1 card at a time switch a
>slot design.

>This doesn't sound like a "feature" to me.   IIRC Apple cards get a slot
>select signal that tells them they are needed.  With all 8 cards on at the
>same time it would be like a cocktail party with everyone talking at once
>because the Apple II bus doesn't have a bus control/negotiation protocol.

>Any thoughts?

I was wondering how this could work as well. I guess one way would be
for the controller card to use the INH line and disable all internal
cards when the external ones were enabled. This would basically allow
you to have two configurations. It really needs a register like the
//gs has that allows enabling each individual slot independently.

These days it would be cheaper and
easier just to have to Apple // computers and a switch box for the
monitor.
-- 
David Wilson  School of IT & CS, Uni of Wollongong, Australia