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Al Grippo and Bruce Bowling have created on MegaSquirt-II, which is a plug-in daughter card which replaces the MC68HC908GP32 with a MC9S12 processor. MegaSquirt-II is basically a plug-in processor card which has the MC9S12 processor plus support hardware as well as a stepper motor chip, and an ignition module controller.
You simply remove the 68HC908GP32 processor on your existing MegaSquirt® and plug in the MegaSquirt-II daughter card and their MegaSquirt® controller is now a MegaSquirt-II® controller - it takes less than a minute to do.
MegaSquirt-II adds the following enhancements over MegaSquirt-I:
|CPU core||8 bit||16 bit|
|Speed||8 MHz||24 MHz|
|Flash||32 Kbytes||64 Kbytes|
|User RAM||512 bytes||2048 (2K) bytes|
MegaSquirt-II (v2.6+ code) has user-configurable fuelling corrections for:
The processor is from the Motorola HCS12 family. It has plenty of excess capability and is a 16 bit machine allowing as much timing resolution as anyone can practically use. Since it is in the Motorola family the MegaSquirt® embedded code will port over quite easily, however the MegaSquirt-II code has been converted to the C programming language since there is a free GNU cross-compiler for this CPU. This will make it much easier for others to customize the algorithms to meet their needs.
The MegaSquirt-II daughter card plugs in to the existing MegaSquirt® processor socket, replacing the MegaSquirt® 68HC908
How to Buy MegaSquirt-II Hardware
The price for MegaSquirt-II is about $90 (US) in 2008.
MegaSquirt-II is an add-on option for a standard MegaSquirt® controller. To learn more about MegaSquirt® EFI Controller, go to the MegaSquirt FAQ and manual. The assembly, testing, and installation of MegaSquirt® is covered at those sites. This site deals only with the MegaSquirt-II add-in board.
The distributors listing can be found at:
Full installation instructions are at the MegaSquirt-II installation page.
There is also a huge amount of collective experience and knowledge related to the assembly and installation of MegaSquirt/MegaSquirt-II in various vehicles available on the MegaSquirt® Forums website.