look at a 128k card to see how
2nd 64k bank is selected.
RW cards have bank select
register (I/O location mapped
into C000 area). You'd have
to have a chip to latch the
bank select register, and then
have that 8bits of data tell another
chip to select the appropriate
64k bank. Should be very easy
to do with some programmable
logic.
have to disable RAM on motherboard
(128k card will show you how)
send select lines from BANK SELECT
to the appropriate bank, connect
data lines from aux slot to RAM. all
64k banks data lines and address
lines can be parallel, with chip selects
connected to logic chip.
you could have 256 extra 64k
banks, this is equal to 16 megabytes.
AppleWorks is the only software
I know of for the IIe that takes advantage
of ram over 128k.
Rich