[Kenneth434]

Also, these are the same parameters the machine have been set on since I've owned the machine for last 8 years

I checked my parameters and they are:
0020: 1
0021: 1
0022: 1
0023: 1
5001: 1
5002: 0
5003: 3
5011: 1
5013: 1
5090: 0
5110: 3
5111: 2
5112: 9

The RS232 port being used is on the CRT board. I've located the other CD1 port on the mother board but I do not have a spare cable or 20 pin Honda plug to build an extra cable. The CD1 cable now runs from the back of the machine, through the base, through the door and up in to monitor area. It will be a pain fishing the cable out to plug it into the mother board. I'm guessing that should be what I try next? Really appreciate everyone's help on this!

Thanks,
Ken