burns@bobcat.bobcat.gatech.edu (James E. Burns) (12/13/89)
I finally managed to find a cheap source for memory chips
($3 each for 256Kx1 100 nanosecond, from a local electronics
parts store) and filled in the Apple Memory Expansion Card on
my Apple IIGS. It turned out I had misinstalled one chip,
leading to a stuck-at-zero error in banks 8,9,A and B.
When I called my local dealer for help, he said he had a
diagnostic that could check things out but could not help
me help myself. A call to Apple only referred my back to
the memory. After some experimentation (involving strapping,
swapping chips, etc) I was able to find and correc the error.
I deduced that banks 8,9,A and B correspond to chip slots
UA9-UA16. Presumably, 2,3,4,5 correspond to UA1-UA8,
6,7,10,11 correspond to UB1-UB8 and C,D,E,F correspond to
UB9-UB16, but once I got things running I quit messing around.
The question is:
Does anyone KNOW what the mapping is?
Where is it documented?
For future reference (I plan to eventually expand again,
probably via GS-RAM Plus), does anyone know where the
AE expansion memory maps?
jim burns
--
James E. Burns (404) 894-3816
School of Information & Computer Science, Georgia Tech, Atlanta GA 30332-0280
CSNet & ARPA : burns@GATech.edu
uucp: ...!{akgua,allegra,hplabs,ihnp4,linus,seismo,ulysses}!gatech!burns