Error at 7FFE

[Tim Ganger]

Message text written by INTERNET:gmecm at efi332.eng.ohio-state.edu
>On a bin for a 730/727 ecm what would a error entry at 7FFE do?, or if to
complex of answer, if it was 00 instead of B0 would a flashing SES light,
and poor running sound like what would happen
Bruce
<

Bruce
        The 68hc11 which is the core prosser used in the 730/727 uses
address FFFE and FFFF as the 
address to jump to on reset. FFFE and FFFF would be 7FFE and 7FFF in the
eprom as read by most eprom readers.
Thus if 7FFE was changed to 00 the resulting address the prosser would jump
to would be 0000 which I belive is the static
RAM aera of the mem map. Then the SES light would flash and the engine run
like do-do because the prosser would not have any usable data to work 
with. 
        If anything were to happen like this again, just look for the
beginnig of the program part of the code and change the reset vector to
that address. The code will always start with the menonic LDS  #???? where
???? is the address of the stack pointer. If you don't have the source code
look for 8E ???? at the beginnig of the program block.

                        Tim Ganger