Re: RAM cards for IIe

[apple2pd@ground.ecn.uiowa.edu (ground.ecn AppleII Librarian)]

In article <20040720183153.19209.00002065@mb-m04.aol.com>,
Michael J. Mahon <mjmahon@aol.com> wrote:
>
>And all later models, like the Q-RAM, conform to the RAMWorks extended
>standard, since it established a _de facto_ bank-switching extension to
>Apple's standard.
>
>If there are any exceptions, it would be interesting to hear about them.

Well, I bought a extended 1MB board (Super Expander IIe, IIRC) that was a
RamWorks work-alike, except the bank switching used a different I/O
address.  From cloudy memory, if RW used $C071, then the SE used $C073, or
some such gimmick.  To use a SE in place of RW in AppleWorks, eg, just
replace the couple of LDA 71 C0 with LDA 73 C0 (SEG.AUX?).  Because of the
way RW decoded addresses I believe this patch worked with both types of
cards.

Trivial difference, I do not know if this qualifies as an exception to the
RW defacto standard.

  --Steve

-- 

 --Steve  (apple2pd@ground.ecn.uiowa.edu)