Ang: RE: [Gmecm] New ROM-code in a 1227747?

[Bill Shaw]

As Dennis said,  the ROM is contained in the CPU.  Removing the CPU and
replacing it with 'something else' is a very big job.  You'd be much better
off using the thirdgen device.  It should be fairly easy to accomplish your
goals that way.

The CPU is a 68hc11 variant with a few special instructions,  built by
Motorola for GM.  You can't replace it with a commercial part without
re-writing the code.

Bill

> --- Per Lonnborg <perlon at passagen.se> wrote:
> 
>> Wow!
>> That was an impressing project going on over there,
>> a complete new TBI-code with better options than in
>> many new EFI-system it seems!
>> 
>> This was a bit more than I had plans for though, so
>> I will ask again if there is a possibility at all to
>> change the onboard ROM with
>> "something else"?
>> 
>> On Ludis pages there are instructions to dump the
>> ROM-content into a computer, so I guess the hard
>> part is to replace
>> that stock ROM chip. What chip is that btw?
>> 
>> I might add that I am quite new to both diy-efi and
>> assembler programming, so maybe some of my
>> questions seems strange!
>> 
>> Thanks,
>> 
>> /Per
>>