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Re: Apple //e motherboards

Subject: Re: Apple //e motherboards
From: "David Wilson" <mcs6502@gmail.com>
Date: 2 Apr 2006 07:03:09 -0700
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dave wrote:
> Why do the North American //e's have the auxillary slot next to the
> power supply whilst the European & Australian models don't ?

I wish they didn't. In a USA model IIe you can put some cards in slot 3
at the same time as a RAM card in the Aux Slot. Any card that only uses
/DEVSEL (the 16 byte I/O space) and not /IOSEL or /IOSTB (the 256 byte
and 2KiB memory areas) will work without affecting the 80-column
firmware - eg Stellation Mill 6809 co-processor card.

I have found one card which uses both the Aux slot and slot 3 at the
same time - it is a 64KiB video card with onboard composite video out
(PAL I assume) that picks up a power rail from slot 3 that is not
available from the Aux slot.

Follow-Ups:
- Re: Apple //e motherboards
  - From: heuser.marcus@freenet.de
- Re: Apple //e motherboards
  - From: Eric Smith <eric@brouhaha.com>

References:
- Apple //e motherboards
  - From: dave <dave@nospam.net>

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