Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!usc!jarthur!nntp-server.caltech.edu!toddpw
From: toddpw@nntp-server.caltech.edu (Todd P. Whitesel)
Newsgroups: comp.sys.apple2
Subject: Re: speed loss
Message-ID: <1991Apr22.223109.24617@nntp-server.caltech.edu>
Date: 22 Apr 91 22:31:09 GMT
References: <643@generic.UUCP>
Organization: California Institute of Technology, Pasadena
Lines: 20

sb@pnet91.cts.com (Stephen Brown) writes:

>I have never heard of "cya", just FPI. What does CYA stand for, what are the
>differences between it and the FPI? Any other info will not satiate my
>curiousity, but it will be appreciated nevertheless... :)

CYA? Cover Your A**.

The differences are documented in the hardware ref 2nd edition, the only
notable stuff was hardware shadowing for text page 2 and a real powered-up
bit that you can read to see if the machine really has just been turned on.

They didn't bother to fix the brain dead refresh timing or the DMA bank
problem (Apple now uses 65816's which are fast enough to allow the FPI/CYA
to spit out the DMA bank on a DMA access without a bus fight). Maybe there
were other reasons but I don't know what they'd be (except no budget, which
I could understand).

Todd Whitesel
toddpw @ tybalt.caltech.edu