Re: 32-bit ProDOS FST

[harold.h@genie.com (Harold Hislop)]

Orion Pax...

(excuse the lac of quotebackl here, am still recovering from the loss
(harrdware failure) of a hard drive here and can't use what I usually
do)
 
Actually I haven't been =too= badly innundated with email about the
work I (and others) are involved in with trying to come up with a
"mega prodos" FST. Most of the questions have been quite good, as have
been a couple of the suggestions :)
 
You comment that instead of the 14/32 TWGS I have, that I should have 
a 16/64 Zip. Sorry, but no... I want my faster accelerator :) The Zip
drops to 1.024 or 2.6/2.8 Mhz on =every= CPU write cycle due to haveing
a write-thru cache manager. The TWGS instead uses a write-back cache so
it does not typically slow down on write cycles (the writeback cache is
only four bytes though... and at 16Mhz it becomes apparent that a larger
one would be desirable).
 
In "real life hands on" human perceived performance, a 14/32 TWGS is
noticably faster than a 16/64 Zip (I've only modified about 100 Zips
to better than 12.5Mhz, and about 20 TWGS's to 14Mhz or so, but I think
thats enough to generalize from :)
 

--
-Harold Hislop
Hardware Coordinator,
Apple II RoundTable, GEnie
14Mhz/32k TWGS, 1Mb Rev-C RamFast, Prototype ROM_03 in tower
(Heritage Mac hardware also spoken (great IIgs peripheral ;))