I have just done a search and not found much on the subject, I want to be able to switch between chips, what do I need to buy and do to make this happen please chaps and chapettes ....... :bow: :bow:

boost can be limited by the ECU by a fuelcut, be it very rough.

it feels a bit like running around with the MAF disconnected.

 

having the "check engine" light blink as soon as knock or safetyboost is detected is also possible, although it needs some reprogramming of the code.

Never thought of that.

With my setup I suppose I could just remove my chip when I leave the car and it ain't going anywhere even if they got past the alarm/imobiliser LOL

 

could you use a hidden switch to disable the chip when you leave the car less chance of damaging the chip

could you use a hidden switch to disable the chip when you leave the car less chance of damaging the chip

 

The socket I have is a ZIF (Zero Insertion Force) type that you just flick a lever and the chip is loose for removal with your fingers but yes it could get damaged by static etc I suppose.

I could probably wire a switch to the power line of the chip so it doesn't respond. Not sure if it might cause problems with the ECU though...

could you not use a memory stick or something

could you not use a memory stick or something

 

Is that a stick for beating you over the head with? :rolleyes: :rofl:

 

If you have a PHD in electronics and lots of cash maybe :)

could you not use a memory stick or something

 

 

hmm no theres a awsome idea, anyone rich lol :D :D :D

could you not use a memory stick or something

 

Not a hope in hell.

 

 

Back to the original concept, two maps on a single chip is easy, four is messy and after that I don't even want to think about it !

IIRC doesn't the 'dual map' chip just use the switch to address the upper memory bank by changing the MSB address line? If so then can't you use a bigger 8-bit EPROM than a 27512 or do they become 16-bit after that?

I think 512 is the biggest that's pin compatible with the 256 layout. For the 1001 I made a daughter board with 2 opto isolators to switch the 2 MSB address lines.

Using optos is a great idea. I can see that one is controlling A15 but isn't the other connected to OE?

Nah, they're both on address lines, board and jumper layout maybe just makes it look like that. Used resistors for soft pull down then opto switches up.