Panasonic JB-3300 Technical Manual page 208

5.10
I/O Interface Circuit
This chapter describes the interface capabilities and various options
available in the computer.
A parallel port for communications with printer, and a serial port for
asynchronous RS-232C communications are available. There are also two
option slots for IBM-PC compatible boards.
The RAM expansion option is also described.
This chapter also describes the proper settings for the internal
configuration DIP switches for the computer.
The following diagram illustrates the positions of the external ports
found on the lower left-hand side of the computer.
Figure 5-63
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