Re: 3.5 drive on IIe question

[mjmahon@aol.com (Michael J. Mahon)]

>Technically, the IIc+ accelerator _is_ a Zip chip.  Apple licensed the
>accelerator design from Zip Technology, and the IIc+ simply has the ASIC
>and cache RAM separated from the CPU instead of everything being bonded
>together in one package.
>
>There may be minor differences in the design, e.g. the method used to
>access the control registers.  Apple provided a new set of firmware
>entry points to control the operation of the accelerator, but didn't
>document how the underlying hardware worked.

Given the intricate (kludgey?) control logic of the Zip design'I would regard
it as counterproductive to attempt cosmetic changes.  Of
course, Apple has not always shown appropriate discipline in
such situations...   ;-)

>I wouldn't expect there to be any major differences such as changes in
>the behaviour of the caching and system bus accesses.

Agreed.

-michael

 Email:  mjmahon@aol.com
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