Re: IIc SD/MMC RAM

[grent@comcast.net]

Michael J. Mahon wrote:
> David Empson wrote:
> > Roger Johnstone <roger@roger.geek.nz.removethisbit> wrote:
> >
> >
> >>In <1homysl.1akj9zoco0cx2N%dempson@actrix.gen.nz> David Empson wrote:
> >>
> >>>kaos116 <kaos116@comcast.net> wrote:
> >>>
> >>>
> >>>>Yes there is a memory expanision header inside. from what I have read
> >>>>and remember. All of the ][c's had it except the very first revisions.
> >>>>I think you could get up to 1 meg inside.
> >>>
> >>>The memory expansion slot was added in the third generation of the IIc,
> >>>but the second generation (with UniDisk 3.5 support) had basically the
> >>>same logic board as the first generation (differed only in default ROM
> >>>size and serial port clocking).
> >>>
> >>>The expansion slot is functionally equivalent to a RamWorks card in a
> >>>IIe: it has a single byte bank address which allows auxiliary memory
> >>>to be switched between up to 256 banks of 64KB, so the theoretical
> >>>limit is 16 MB, but the hardware interface might not provide all of
> >>>the bits of the higher address bus.
> >>
> >>David, I think your books have been stashed away for too long. The
> >>original third-party memory cards for the IIc used bank switched memory,
> >>but Apple's memory card had a slinky interface just like the Apple II
> >>Memory Expansion Card used in the Apple II models with regular Apple Bus
> >>slots.
> >
> >
> > Oops, you're right. Sorry about that folks. I was getting confused with
> > the Applied Engineering product which plugged into the MMU socket.
> >
> > Maybe I should think about getting rid of my books and stop posting here
> > if I'm starting to forget important details.
>
> Please don't.  ;-)
>
> I'm in awe of the level of detail that you routinely remember!
>
I agree with Mike, you have forgotten more than most of us has ever
knew about apple II. You still have a lot to contribute.

The trick to making more room is stacking the stuff. But it does making
it hard to get was is at the bottom.

Take Care