Re: Apple II GS Question

[dempson@actrix.gen.nz (David Empson)]

Brian Uhreen <bduhreen@spots.ab.ca> wrote:

> : In article mportune@telerama.lm.com (Matt Portune) writes...
> 
> [snip]
> : >And yes, especially with a meg of cache on the RamFAST and the slot set
> : >to "fast" on the Zip, hard drive performance is SCARY.  What was our
> : >shift boot speed, Mitch?  I know mine is about 3.5 seconds from
> : >splash-screen to desktop, and yours was a hair faster if I remember
> : >correctly.  (I'm still running at 14.33 MHz)   :)
> 
> How, exactly, does the Zip accelerate the slot speeds?

It doesn't.  If the Zip has a slot set to "slow" mode, then accessing
the slot I/O locations or firmware causes the ZIP to stop accelerating
the machine for the next 50 milliseconds.  This is intended to allow for
devices which have firmware or support software which is relying on the
processor speed for timing.

If the slot is set to "fast" then there is no slow down, except for the
actual cycles in which memory are accessed, which are at 1 MHz or 2.8
MHz as appropriate.

-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand