Peeps
Can't communicate with my 4020 that we purchased at auction . I have another fadal so have tried swapping some bits
I have tried the following to 1030-1c

2 known good pc
2 know good cables from pc to vmc.
Swapped the rs232 cable from the cab to the 1030 board
Removed the card cleaned contacts with a rubber and installed.
Replaced both the 1489 and 1488 chips on the 1030 card.

Still nothing.

The only thing I haven't changed is the 1030 card.
My other fadal has a 1030-1 card with a different suffix maybe a 'b'
Can they be interchanged safely?