Output port
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Connector on some MVS boards (like the MV1B) which do not have DA-15 joypad connectors, used to obtain the 6 output lines for special controllers such as trackballs.
Warning: these output lines come straight from NEO-SDR-T chips through resistors and not from open-collector inverters like on joypad port equipped systems ! This means that their state might not be inverted in relation to the REG_POUTPUT register.