Doug,
Download this data sheet and take a look.
This is an upgrade to the current 68HC908 chip used in the MegaSquirt.
The current MegaSquirt would benefit from a more powerful chip
as you could then add a MAF and other things without kludging up
the basic MegaSquirt.

It does not make sense to stick with a limited single chipper.
This one looks like the best bet. MC9S08AW60 is 64 pins instead of 42.
You want a single chipper with the most amount of I/O you can find.
That actually makes software easier to write. You can then add the
8 hardware interrupt circuit and make things real easy to program.

http://www.alldatasheet.com/datasheet-pdf/pdf/167748/FREESCALE/MC9S08AW32.html
It has more pins and there are I/O more ports. It is code compatible.
I assume you are getting into 68xxx assemble language programming.

You will have to do a new circuit board but a lot of current MegaSquirt
I/O schematics and ideas can be used.

Paul Lamar

Paul


Agreed.  More I/O ports would be a good thing.  I have stepped back from
ignition and control challenges  at the moment because so many good ideas
are coming out.  I will pass your suggestion on to the MegaSquirt forumn
and the designers to see what they have to say.  I have Version 3 board
which is doable with Map and or MAF and I think both.  For multiple
sparks I would have to make up a seperate  board and basically cascade
fire the caps.

I am now concentrating on more mundane things like making parts.
Last week I made my water rudder retract system, and  boring tool to do
the final inside housing step.


Doug in Japan