This "Pfutz's Programming experience with hardware" applies to:
Pinball Magic, Airborne, Flipper Football, & KingPin Pinball
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"Improper Driver Board Error"
Disclaimer: Remember that are getting hardware advice from a software person, would you let a used car salesman give you stock market advice?
Is an error message, in the dot matrix display, meaning that the Driver Board is not connected to the CPU board, or the I/O board is malfunctioning, or not powered.
(something is very wrong!). The Driver Board was assigned a "number", and if this number is not correctly read, you get this error.
There is a high probability that the problem is on the I/O board. HOWEVER, it can also be: the CPU board, the ribbon cable or connectors that connect the 2 boards, or a power supply to or on the I/O board.
Theory of operation:
The CPU reads data at an address that goes through the ribbon cable to the connector J12,
then to the Chip U14. The address triggers U14.14 ("BRD_ID") signal low at CPU speeds (micro seconds).
This select line goes to chip U55 which puts certain data on the data BD8 to BD11 lines.
Specifically BD8=1, BD9=1, BD10=0, BD11=0.
This data goes back to the CPU and these data bits HAVE to match.
If they do not match, you get the "Improper Driver Board" error.
Be sure that at least these chips have the proper supply power.
The schematic, as a routine, does not list those "boring" (but required!) power supply pins.
Here are some internet picutres of those chips.