Re: The Apple IIgs, Disk II Interface Cards, and UDC clone

Newsgroups	comp.sys.apple2
Date	2021-03-24 18:34 -0700
References	<99662515-b278-465a-9118-d00f12ebfbccn@googlegroups.com> <g0M6I.123586$398.32083@fx46.iad>
Message-ID	<3a67dba9-b137-478c-9e2b-e46ac955019en@googlegroups.com> (permalink)
Subject	Re: The Apple IIgs, Disk II Interface Cards, and UDC clone
From	Nick Westgate <nick.westgate@gmail.com>

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On Thursday, March 25, 2021 at 5:01:41 AM UTC+10, Scott Alfter wrote:
> Slots 1 and 2 were taken by the serial ports and slot 3 was taken by the 
> 80-column firmware.

Sure, that's the typical usage. It's just weird that Disk II Interface cards would have magically worked in the higher slots, and tragically crashed in the lower slots. They could've supported all slots without problem, so I wonder if they did it this way to free up bits in the speed register (unlikely) or free up transistors in the FPI (more likely I suppose).

It was a long time ago, so I forget how well this limitation was known. I'd forgotten - if I ever knew.

Cheers,
Nick.

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Thread

The Apple IIgs, Disk II Interface Cards, and UDC clone Nick Westgate <nick.westgate@gmail.com> - 2021-03-24 06:24 -0700
  Re: The Apple IIgs, Disk II Interface Cards, and UDC clone Scott Alfter <scott@alfter.diespammersdie.us> - 2021-03-24 19:01 +0000
    Re: The Apple IIgs, Disk II Interface Cards, and UDC clone Nick Westgate <nick.westgate@gmail.com> - 2021-03-24 18:34 -0700
    Re: The Apple IIgs, Disk II Interface Cards, and UDC clone Mike Spangler <mspangler@ifiber.tv> - 2021-03-25 10:33 -0700

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