I don't see any "lock 2" lights in the matrix.
What is the lamp number I'm looking for?
Ahhh... I spoke too soon.
It's the second Joker, lamp 19.
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I don't see any "lock 2" lights in the matrix.
What is the lamp number I'm looking for?
Ahhh... I spoke too soon.
It's the second Joker, lamp 19.
See if you can replace the pia at 11D.
The strange thing is that both lamp 18 and lamp 19 signal comes from two different inverters, 12F and 11F (7406).
Otherwise I would see the inverter is bad.
The PIA is the communicator between the CPU and the outgoing signals.
See it as a decoder for the data and address signals coming from the CPU.
An inverter inverts the signal from the input to the output.
Say a high signal comes in, the corresponding output goes low.
Replacements are available at the regular parts shops.
Mouser, Marco Specialties, Great Planes Electronics, you name it.....
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