Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!umd5!uvaarpa!mcnc!decvax!decwrl!ucbvax!WPI.BITNET!DSEAH
From: DSEAH@WPI.BITNET
Newsgroups: comp.sys.apple
Subject: RAM
Message-ID: <8804222243.AA01975@wpi.local>
Date: 22 Apr 88 22:43:10 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 34

If you write to a //e I/O location, you won't read back what you wrote.
To maintain compatibility with the Apple ][+ yet to provide exhancements
to the Apple //e, some locations are used "twice".  You write to location
xx to set something, and read xx to find out something else.  The
Apple //e Reference Manual is a good source for information regarding
use of the auxiliary memory.  So, so have to keep track of what
bank of memory you are using yourself.  Incidentally, I think the
location for the push buttons are $C061-$C063.

To verify that your Ramcard does work, you may wish to try this small
program.  Get into the monitor and type
this in:

* <- monitor prompt

*300:18 4C 11 C3<return>
*3F8:4C 00 03<return>

This program will make a new monitor move command.  If you type

*2000<2000.3FFF<ctrl-y><return>

the stuff in auxiliary memory 2000 to 3FFF will be moved to main memory
starting at 2000.  To move stuff from main memory to auxiliary memory,
change the 18 at $300 to 38.  Then the above command will move
data from main memory 2000 to 3FFF to auxiliary memory starting at
2000.  Try putting a picture in main memory (2000-3FFF) and moving it
to auxiliary memory.  Load in a different picture, change the bank
to the next one in your ramcard, and move the picture again.  Then
clear hires page 1 and see if you can load the picture back.  $300
must be 18 for auxmem->main, 38 for main->auxmen.
+-----------------------------------------------+---------------------------+
| Bitnet:   DSeah@WPI.Bitnet                    |  We can't receive files!  |
| Internet: DSeah%WPI.Bitnet@CUNYVM.CUNY.EDU    |  EMAIL only! Apples Rock! |
+-----------------------------------------------+---------------------------+