Re: What is max IIe RAM? 24meg possible? ;-)

[behrenss@muc.de (Soenke Behrens)]

In article <1994Mar22.180933.13618@cnsvax.uwec.edu>,
 <perlockp@cnsvax.uwec.edu> wrote:
>Just a minor question for those hardware gurus out there who know the normal
>Apple II (not IIgs) system..
>The Applied Engineering memory boards can hold 4 or more megs of RAM 
>(RamFactor III or similar?) and fit on one slot...
>What if we put, oh, SIX 4-meg memory boards into the Apple II? Could the system
>handle having 24megs of memory in it? What exactly is the maximum RAM the
>system can handle? *wild grin*

If you designed it that way, it could. The maximum physical memory range of
a 65C02 is 64k. Everything beyond that is accessed by "bank-switching" in
relatively small amounts of memory (<= 64k). Actually <, since you need some
code to stay where it is (like OS, parts of the current program, I/O switches,
etc.). So, yes, you could build a 24MB card. And it would be near useless:
Slow, and too much mem for such a small machine, anyway.

Soenke