Re: TurboRez - Released Yet?

[seah@ee.rochester.edu (David Seah)]

In article <9303261514.aa25848@Bonnie.ics.uci.edu> jlee@Bonnie.ICS.UCI.EDU ("Joseph T. Lee") writes:
>In <1993Mar26.202410.16125@news.columbia.edu> Steven T Chiang writes:
>>	Maybe... However, the 1 mhz bottleneck is a pain.
>Isn't there a way to bypass that bottleneck? [stuff deleted]

In a previous chat on AOL, Bill mentioned that he bypassed the 1MHz
bottleneck.  I/O and DMA to a peripheral card are limited to 1MHz by the
IIGS, but there is nothing that stops a peripheral card from "snooping" the
system bus to essentially read data at 2.8MHz.  Apparently, there is a
special sequence of instructions that is executed that activates the
TurboRez, which then reads data from the multiplexed data lines as put there
by another special sequence of instructions.  Hence, there is no mucking
about with DMA or the $E0/C0xx range.

>Hey, who and which Bill are you talking about?  It can't be Bill Heineman..:)

That's Bill St Pierre, the designer of the TurboRez board.  Very nice
guy in person.
-- 
Dave Seah (seah@ee.rochester.edu, AFCDaveS@aol.com)