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This page describes how the hardware in an ECU works, and fun things you can do with it. If you are just wanting to learn how to chip your ECU, you should look at What You Need instead. If you are looking for detailed information about what is going on inside a particular program, you might want to look at Rom Maps.

Honda definitely did not reinvent the wheel in terms of ECU technology for each new motor they released. Each "family" of ECU generally shares one or more PCBs that are populated with different components in order to run different motors. This really opens the door for ECUHardware Mods. Additionally, there are design peculiarities that carry over from one family to another.

ECU Families:

If you want to learn about how the Oki 66K MCU works, you should look at 66k Assembler Docs.

There are many ECUHardware Mods you can do to change how ECU hardware works.

Honda often used MCUs that had internal (on-chip) programs. These were often copy protected. There are Mcu Readers to defeat the copy protection.

Ever wonder who designed honda's ECUs? Kehein Indiana Precision Technology is to blame...

It is possible to switch between more than one program on your oversized EEPROM. All you need to do is add a pullup resistor to the extra address lines (A15, A16, Etc.), then to switch them, just add a debounced switch to the address lines to ground them.

Here is a diagram of 28 & 32 pin EEPROMS:

Attachment?: Modify: Size: Date: Who: Comment:
1.32_pin-2-28PinIC.jpg mod 39713 06 Feb 2007 - 01:39 Jared Karagen? EEPROM pinouts

Revision: r1.4 - 06 Feb 2007 - 01:40 GMT - Jared Karagen? { Edit | Attach | History | More }
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