Panasonic JB-3300 Technical Manual page 124

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Parallel Port
The parallel port in the I/O board controls the printer. It is
Centronics compatible.
HD Controller Slot
The I/O board has a edge connector for HD controller. In the HD
version, an HD controller is installed to this connector.
Serial Port
The serial port in the I/O board is used for communication with
external device.
The serial port employs an INS8250 control LSI (UART) and is capable
of communicating with an external device through either the RS-232C
or current loop interface.
Option Slots
The I/O board has two option slots. Both are IBM-PC compatible;
"13" option board for either an IBM-PC or IBM-XT can be connected.
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