Missing Computer

I have a Vr4 92 galant E84a 6A12tt 2.0 V6 i just bought but the previous owner lost one of the computer he took to fix. i need to know how much computers should be there under the dash and what are ther for.
Symptoms : The car wont start period.

I located three boxes and the numbers are as follows.: # MB852142, #MB943420 and #MD180564. there are some loose harnesses which i believe are the ones for missing computer. if anyone has the same galant as mine please contact me.

thanks
VR4 addict