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From: toddpw@tybalt.caltech.edu (Todd P. Whitesel)
Newsgroups: comp.sys.apple2
Subject: Re: Posting a series of questions for a friend.
Message-ID: <1990Oct10.205012.4878@nntp-server.caltech.edu>
Date: 10 Oct 90 20:50:12 GMT
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To answer one of your questions:

When the card's firmware tweaks $cfff, all cards turn off their C800-cfff
space. Cards turn on their c800-cfff space whenever they are accessed in
the range $CnXX -- normally this is the CPU reading the next instruction
after the $cfff reference, but you can do it manually from the monitor.

Notice that 80 columns uses the c800-cfff space so you will have to work
in 40 with the 80 column firmware off (blinking checkerboard cursor, not
solid square).

Todd Whitesel
toddpw @ tybalt.caltech.edu