Re: RAMWorks 2 Chips

["ict@ccess" <gids.rs@sasktel.net>]

On Jun 13, 10:16 pm, mdj <mdj....@gmail.com> wrote:
> On Jun 14, 1:06 pm, demp...@actrix.gen.nz (David Empson) wrote:
>
> > It looks like it may have been written originally to claim 16 MB maximum
> > capacity, but then amended to reflect the actual maximum they were
> > planning on selling, but someone missed changing the "16" to "3".
>
> I believe that > 3mb capacities were in fact sold made to order, by
> piggybacking additional 2mb expanders on top of the existing one.
> While I've not ever seen such a thing myself, it seems that by re-
> exporting the piggybacks physical interface you could support as many
> as you needed, and simply supply a different PAL for each board so
> that it selected the correct bank based on the high order nibble of
> the bank select register. Since all expanders would have the same
> memory configuration, you could probably get away with only generating
> refresh on the first card and have the others piggyback off it.
>
> I'm somewhat surprised that nobody has bothered to re manufacture a
> higher capacity version of the expander. There are times when having 4
> (or 5) mb on the IIe would be rather handy.
>
> Matt

Even the Ramfactor claimed to access up to the 16 MB but only with the
65c816 apple IIe card

http://ae.applearchives.com/all_apple_iis/ramfactor/ramfactor_brochure.pdf