I see what you are saying.. but if you look at the first diagram I posted there are only 36 connections on the Input/Output control cable CN-I/F.

I've counted inside the connecter and there and theres 36 connections (18 each side - not 19 and 17 as shown in my numbering...sorry). Then on the other end (connection to the AHHA board) is a 36 pin serial connector. Would they really use a 72 pin connector when they only used 36 of them?

Also the pin out picture you posted (from the manual) uses 4 rows of 9 pins (making 36 pins). Which is also just strange.... if there was more pins would they really only use the top half?

The whole thing would be so simple if they just had Pin 1, Pin18, pin 19 and 36 marked on the device. I posted hoping someone had fitted these type of drives before and would instantly know. It looks like one of situations where if you "know" you know, but if you don't... you don't and there no way to actually work it out.

I do appreciate your time and effort though, it's just very frustrating trying find out this info that should be readily available in the manual.

thanks again