Re: 65816 in a IIe? (or, buddy, can you spare a 65802?)

[dempson@actrix.gen.nz (David Empson)]

Ron Kneusel <rkneusel@mcw.edu> wrote:

> Greetings all!
> 
> I have been told that it might be possible to put a 65816
> CPU (from a IIgs I imagine) into a IIe so that one would have
> the functional equivalent of the rare 65802.  Does anyone know
> for certain if this is possible and how to go about doing it?

Some people claim to have done this and it appeared to work, but I
wouldn't recommend it.

The major difference is that the 65816 uses the data bus pins for a
second function, namely outputting the bank address during the first
half of each cycle.

Here is a slightly reworded extract from an article of mine from about
18 months ago that covers the remaining details.

Several pins are used for totally different functions on the 65C02 and
65816, and some of these happen to include a reversal of the signal
direction.