Dual Rom's on ECU

[Holden202T]

outside the box thinking and tinkering is how technology progresses, nothing wrong with that!

[norm426]

Just wondering what it is that you're doing that requires using two seperate eeproms?
Bin stacking and switching an A line would be a lot simpler, so assume you must have a reason not to do it that way...

What does "Bin stacking and switching an A line" mean? How do you do this?

I am trying to work out how to use an input to switch between gas and petrol, to turn the injectors and fuel pump off.

Could this be the answer?

[VL400]

Bin stacking is using a single memory chip and having two bins loaded. The memory chip needs to be at least double the factory size for this. "Switching an A line" is switching an address line. If you have a memory chip that is double the size of a stock chip switching the highest address line low and high will access different parts of memory.

In this picture, take the middle column called VR man. If you have a 64k byte chip (or 512k bits) loaded with two 32k byte bins and switch the upper address line you will access the grey section (address 0-7FFF) and white section (address 8000-FFFF) depending on a high or low logic level of the address line.

[jacomms]

Boy this brings back the memories.......

switching address lines and carving up memory locations

VL400 has made it just all to easy for us ....... THANX MAN!!!!


Justin