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From: ee161abt@sdcc18.ucsd.EDU (Grobbins)
Newsgroups: net.micro.apple
Subject: Re: About the //e upgrade to //GS
Message-ID: <545@sdcc18.ucsd.EDU>
Date: Wed, 8-Oct-86 18:39:19 EDT
Article-I.D.: sdcc18.545
Posted: Wed Oct  8 18:39:19 1986
Date-Received: Thu, 9-Oct-86 06:32:44 EDT
References: <673@sphinx.UChicago.UUCP> <1527@k.cc.purdue.edu> <686@sphinx.UChicago.UUCP> <4217@reed.UUCP>
Reply-To: ee161abt@sdcc18.UUCP (Grobbins)
Organization: U.C. San Diego, Academic Computer Center
Lines: 20
Keywords: //gs, //e upgrade

In article <4217@reed.UUCP> kamath@reed.UUCP (Sean Kamath) writes:
>In article <686@sphinx.UChicago.UUCP> god3@sphinx.UUCP (Peter Godwin) writes:
>>o  Various multifunction cards which work on //e's may not work properly
>>   on a IIgs (call the company and ask if concerned).
>This is because they "Phantom" slot.  Phantom slotting can still be done
>on the GS, but you have to use the 'IOselect line.

Doesn't phantom slotting demand decoding of the address bus rather
than depending on the IO-select line?  And doesn't that preclude the
use of phantom slotting (short of running a jumper to read another
slot's I/O select signal)?

I'd think the problem is all due to the fact that the machine now
uses a 24-bit address bus, but not all of the address lines
are available to the slots.

Study the Slotmaker chip, and let me know...


Grobbins.