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

[david@osiris.cs.uow.edu.au (David E A Wilson)]

ntt@cleese.apana.org.au (Jonathan Pratt) writes:
>Never actually used one myself but most s/w (including ProDOS) only
>actually looks for one RAM card, beginning with slot 3, then from 7 to 1. 
>You may have to actually write your own software for multiple cards. 
>(dunno what comes with RamFactor)

ProDOS would have no problem with 6 standard slot RAMcards (Apple 1MB, Cirtech
or RamFactor) as they are just Smartport devices. ProDOS only uses the first
bank in an Aux slot card (you need a custom driver to access the rest).
Appleworks can use some Aux slot cards itself.

>If you want to build your own card, get a couple of 16meg SIMMS and attach
>them to a card.  All you need now is some memory refresh, address decoding
>and bank select (buffer) circuitry.  Stick your card in the aux slot of
>the //e and you've got as much RAM as you can afford.  Just gotta write
>the software for it.  Not unless you have many other cards, or an aweful
>lot of RAM will power consumption or heat dissipation become a major
>consideration.

Don't forget to add circuitry so that video only comes from the 1st bank
of aux memory otherwise your 80 col and double hires displays will look
awful each time you access another bank.