[Diy_efi] Factory turbo motorcycle reverse engineering project

[Alexis PAVLOV]

I know nothing about these ECU, but would assume the
8755 is for knock signal processing. Just like on early
Bosch M2.1 Motronics.

Adam Wade wrote:
> 
> Well, I am working on developing chips for the Honda
> CX500 Turbo and hopefully the CX650 Turbo as well.
> 
> Here's what I have so far:
> 
> "As I surmised in an earlier post, the CX500T unit had
> a 8xxx MPU of some sort as the box used the 8253 PIT,
> which is used with the 8xxx family. Futher
> investigation of the pinouts leads me to believe the
> MCU is in the 8035/39/40 sub-family. Nipondenso is
> large enought to fab their own chips, but I think they
> only "branded" the available chip with their
> number...ND079753-0021. I tried to read on-board ROM
> as an 8048/49, but got nothing in the read buffer. The
> 8035 units are CPU only with no memory on-board. All
> these chips use the same pinout.  The companion chip
> is a 8755.  The 2716 eeprom is standard."
> 
> I have hex dumps of both the 2716 and the 8755.  I am
> trying to sort out which maps are where, and to
> disassemble the machine code, as there is an overboost
> fuel cut-off I wish to eliminate.
> 
> If I can't get it sorted to where I can burn my own
> chip, I may just build a Megasquirt.  But since I can
> socket the EPROM, it makes more sense to me to just do
> tabletop work and save my money and testing effort.
> :)  I have access to a step-testing eddy current dyno,
> as well as an attached four-gas analyzer and an
> emulator, so once I get the code and the maps sussed,
> tuning and burning a replacement chip will be simple
> and easy.
> 
> Old-tech wizards, I'm looking forward to hearing from
> you.  :)
> 
> =====
> | 82 Honda CX500 Turbo (Cassandra)  90 Kwak Zephyr 550 (Daphne) |
> | "It was like an emergency ward after a great catastrophe; it  |
> |   didn't matter what race or class the victims belonged to.   |
> |  They were all given the same miracle drug, which was coffee. |
> |   The catastrophe in this case, of course, was that the sun   |
> |     had come up again."                    -Kurt Vonnegut     |
> |   Buy my M/C Fuel Inj. Handbook  -  http://tinyurl.com/2e8eu  |
> 
> 
> 
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