Re: Apple IIe Card

[Mike <mike@apple2scans.net>]

On Fri, 14 Oct 2011 09:41:34 -0700 (PDT), KP <kjpmail@gmail.com>
wrote:

>On Oct 14, 10:47�am, Mike Maginnis <mmagin...@gmail.com> wrote:
>> On 2011-10-14 04:22:36 +0000, Mike Spurgeon said:
>>
>> > On 10/13/2011 7:14 PM, D Finnigan wrote:
>>
>> >> Apple's Tech Info Library article 8458 lists the following models as IIe
>> >> card
>> >> compatible: LC, Colour Classic, LC II, LC III, LC 475, LC 520, LC 550, LC
>> >> 575, Quadra 605, Performa 4XX, Performa 55X, Performa 56X, Performa 57X.
>>
>> >> The Colour Classic II is not listed in Apple's article but *may* work. No
>> >> other model will work. "
>>
>> > It uses the same motherboard as the newer Performas, hence has a PDS
>> > slot, so it should. �Must have been newer than the list...
>>
>> IIRC, there were a couple of models like that which could be made to
>> work "unofficially". �This is from the hazy, dark cobwebs of my memory
>> so I could be a bit off, but essentially you had to reduce the amount
>> of RAM in these machines to 8 MB, at which point 24-bit addressing
>> could be re-enabled in Mac OS 7.5.5 or earlier and the card would work.
>> �When I was researching this hack, I wrote down the names of a couple
>> of models in which it was supposed to work; I'll have to dig that up
>> again to sure.
>>
>> Ivan Drucker put together a great presentation for KansasFest about
>> this card a year or two ago. �You can download it from the KansasFest
>> website in the Sessions Archive area.
>>
>> --
>> - Mike
>>
>> Podcast:http://open-apple.net
>> Scans:http://apple2scans.net
>> Blog:http://6502lane.net
>
>Would the IIe card work on a Performa 600?

I got it working in my Performa 630CD, which I think is a later model
than the 600 so in theory anyway, it should be possible.  For mine, I
had to remove physical RAM and downgrade the version of Mac OS to
7.5.5 (it came with 8.0 on it) to make it work.

As others have stated above, the Mac has to meet three requirements to
be able to host the card:

1) PDS slot
2) the ability to do 24-bit addressing
3) Mac OS 7.5.5 or below

The 24-bit addressing limits you to a maximum of 8MB of physical RAM
in the machine, and to Mac OS 7.5.5, as Apple removed the option to
enable 24-bit addressing from later versions of the operating system.

My opinion - and I could be totally off-base here - is that Apple
never officially supported some of the later Macs for use with the IIe
Card because it would require customers to downgrade their machines,
which no company would want to advise people to do.

- Mike Maginnis

Blog: 		http://6502lane.net
Scans: 		http://apple2scans.net
Podcast: 	http://open-apple.net