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

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

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:

• EEPROM pinouts:
  

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