Hello gentlemen

this looks like a Honda ECU serial communication code....i'll post the dissambly that i found on a 90 Civic MPFI ecu...

push acc
push psw
mov psw,#018H
mov r1,sbuf
mov a,@r1
jnb rb8,L804A
mov r0,#00FH
movx a,@r0
add a,#0FCH
movx a,@r1
jc L804A (i started at org $8000)
clr ea
inc p2
movx a,@r1
dec p2
setb ea

email me if you want to join efforts on this!
i want to be able to communicate with a PC and retrieve data from it (for now)