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THe 88-89 Accord OBD-0 B20A ECU uses an Electronic Advance distributor. It has an External 27c256 ROM and is oki 80c154 based
This ECU is very similar to the PK2 ECU for the 88-91 Prelude. However, it has the second O2 sensor disabled via BR8
The 86-87 Accord OBD-0 B20A is oki80c514 based but has a 27c128 rom.
It does not have a backup processor but seems to use 2 OKI processors instead
This ECU has 2 diagnostics Leds
Note, the latest PH3 and PK2 ECUs share almost the same board they are 99% similar, only slight differences can be seens between them.
They are so similar that they can even share the same program so far.
I posted the Options Close-up for the PH3-0732 and PH3-0632 88-89 Accord B20A ECUs.
The 0732 is supposedly from an auto car and the 0632 a manual.
I don't know if these options are related to the transmisson type or emissions.
The manual PK2 ECU has the same options configuration as this Auto ECU so I'm not sure what these do yet
There is also a close-up of the BR8 jumper. This jumper seems to be the one deactivating O2 sensor B input on the PH3 board. It's connected directly on the Sensor's pin. The PK2 shares almost the same Boads as the PH3 but has this jumper Blank. (see the PK2 ECU section)
Carotman
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