Question about connector numbering (J20, Asteroids Deluxe)
For Asteroids Deluxe main PCB, can someone decode the J20 numbering? The schematic has strange entries like "J20 X", "J20 2 B" as well as normal ones like "J20 21".
J20 21 clearly means pin 21, but how do you count the pins? Where is 1 and how does the numbering handle both sides of the PCB?
Are things like "J20 X" just symbolic info and you should, through some other source, know that X is actually PIN something or other?
Thanks
For Asteroids Deluxe main PCB, can someone decode the J20 numbering? The schematic has strange entries like "J20 X", "J20 2 B" as well as normal ones like "J20 21".
J20 21 clearly means pin 21, but how do you count the pins? Where is 1 and how does the numbering handle both sides of the PCB?
Are things like "J20 X" just symbolic info and you should, through some other source, know that X is actually PIN something or other?
Thanks

