"Mine is a 1217-54, so the earlier revision. I assume this won't have the multilevel output?
Looking at the schematics again, they seem to be for a 9 pin connector, whereas this board has a 15 pin connector."
The original MB1217 board only used 9 pins of the 15 pin connector. so only the used pins were shown on the schematic.
The latter version use some of the pins not originally used to keep compatibility.
The latter version had the circuit built in for taking the RGB high intensity and the RGB low intesity outputs and put then together to give a three level analog type output suitable to analog RGB monitors.
There was a circuit diagram around that enables this adaption to be done externally, I have a small plugin box that goes between the 15pin output and goes to a SCART connector of an old Monitor TV which works a treat.
Call me if you would like to borrow it for testing, assuming you have a SCART input monitor/TV to plug it into.
Ernest
Looking at the schematics again, they seem to be for a 9 pin connector, whereas this board has a 15 pin connector."
The original MB1217 board only used 9 pins of the 15 pin connector. so only the used pins were shown on the schematic.
The latter version use some of the pins not originally used to keep compatibility.
The latter version had the circuit built in for taking the RGB high intensity and the RGB low intesity outputs and put then together to give a three level analog type output suitable to analog RGB monitors.
There was a circuit diagram around that enables this adaption to be done externally, I have a small plugin box that goes between the 15pin output and goes to a SCART connector of an old Monitor TV which works a treat.
Call me if you would like to borrow it for testing, assuming you have a SCART input monitor/TV to plug it into.
Ernest