Re: IIc SD/MMC RAM

["kaos116" <kaos116@comcast.net>]

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.
My idea is to have a very small unit that attaches directly to the back of 
the ][c and has a pass through for adding additional floppy drives. I want 
it to be completely Prodos compatible. Meaning no special drivers. You plug 
it in an Prodos sees it and knows what to do with it. This would also make 
it compatible with the ][e/gss'. From what I have been reading in the Prodos 
Tech Ref Manual and Beneath Prodos. Their doesn't seem to be limit to the 
size of a volume. Just a limit to the number of files per directory. If 
there is a limit to volume size(32meg) which I have read in the docs for the 
CF adapters for the ][e/gs , I could add a small dip switch on the side to 
select different volumes. 4x32meg volumes on a 128meg SD card. Not sure 
about this yet.

My first step is to figure out what signals come out of those pins during 
boot up . I need to find and read those books referenced in the reply above.



"mmphosis" <markstock@mail.com> wrote in message 
1163184281.700229.42670@b28g2000cwb.googlegroups.com">news:1163184281.700229.42670@b28g2000cwb.googlegroups.com...
> Isn't there a way to connect more RAM to a port underneath the keyboard
> of the IIc?  I have old manual describing a 256K/384K/512K RAM card
> that was installed in the IIc underneath the keyboard.  It bank
> switched 64K RAM at a time in the auxiliary memory space.  Would it be
> much of a leap to add more address lines (and IO memory locations) to
> access all of the memory on SD/MMC and connect this in the same way
> underneath the keyboard of the IIc?  You could also give other options
> of access rather than just bank switching RAM in the auxiliary memory
> space, like the way AE Ramfactor provides an IO address to read/write
> one byte at a time to/from RAM and automatically positions to the next
> byte.  If one could build a IIc SD/MMC RAM card, I imagine a ProDOS
> driver for this would follow.
>