A totally different TP application (bin attached)

[1BadAction]

Noticed that the Mercury marine digital EFI Race boxes used a 28 pin removable chip, so I got a bit curious...

Pulled the attached bin off the chip. 64kb. Scrolling through the 3d Data viewer there are definitely some tables that look like the correct fueling profile for a 2 stroke. This particular ECM used a MAP only, no TPS or any other sensor, other than RPM input. There was also no control of ignition, that was all mechanically controlled by a linkage and trigger.

Anyhow, let me know what you guys can see in this hex file and post up. I have no idea where to start writing an XDF for this because there's no hack, only comments(?) So I am open to any suggestions.

[RobertISaar]

got any idea of what microcontroller is in that box? knowing that, one can start disassembling the BIN.

[1BadAction]

got any idea of what microcontroller is in that box? knowing that, one can start disassembling the BIN.

As far as we know, it's a Motorola 68C11.

[RobertISaar]

pictures/description of the main chip?

after looking at the BIN in a hex editor, it repeats itself right at $8000, so it is actually a 32KB BIN. it has enough vectors at the end of the file to imply to me that it's a standard part, not something like a GM P4 which is its own little brand of different in the world of 6811.

I can look at this more later, I have to leave for a few hours.

[1BadAction]

pictures/description of the main chip?

after looking at the BIN in a hex editor, it repeats itself right at $8000, so it is actually a 32KB BIN. it has enough vectors at the end of the file to imply to me that it's a standard part, not something like a GM P4 which is its own little brand of different in the world of 6811.

I can look at this more later, I have to leave for a few hours.

28 pin UV style chip that I ripped the bin from just like I would from a 27sf512. ECU is a MAP/RPM only marine unit that is used on high performance 2 stroke V6 outboards. There are multiple variations of this ECU that are the same thing with different chips. The bin I posted is from the most desirable A48 version, which is a 9200 RPM limit. Fueling should be mapped out past 11k (a common mod is upping the rev limit to 11,500 so the high compression drag motors aren't on a limiter at half track)

[RobertISaar]

preliminary info: standard 6811 from what I can tell. has 256 bytes of RAM. most of the PROM is just completely open... code runs from C379 to D48A, a little more than 4000 bytes. calibration seems to run up to 90BF, at most, even then a lot of it looks like filler.

[Hog]

28 pin UV style chip that I ripped the bin from just like I would from a 27sf512. ECU is a MAP/RPM only marine unit that is used on high performance 2 stroke V6 outboards. There are multiple variations of this ECU that are the same thing with different chips. The bin I posted is from the most desirable A48 version, which is a 9200 RPM limit. Fueling should be mapped out past 11k (a common mod is upping the rev limit to 11,500 so the high compression drag motors aren't on a limiter at half track)

Could you please tell me what the tube is for?

peace
Hog