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PK-88 OPERATING MANUAL
2.11
Detailed Connections for Specific Computers
Many computers require a serial port adapter card that incorporates the
necessary interface circuitry. Some popular computers in this category are the
Apple II series, the IBM PC (and many compatibles), the Tandy 1000, 1200 and
3000-series computers and the Sanyo MBC-55X series. If you are using one of
these computers refer to the section, 'Other Computers with Nonstandard Serial
Ports.'
Computers that do not have a serial port and do not permit use of a suitable
adapter or level converter cannot be used with the PK-88.
2.11.1
Computers with Specific Serial Interfaces
Apple Macintosh
The Macintosh serial port is compatible with the RS-422 standard, but can be
used with the RS-232C port on the PK-88.
Wire a cable as shown below:
MACINTOSH (DB9P)
Note that pin 1 is not connected inside the Macintosh. Use a shielded serial
cable and connect both pins numbered '1' to the shield. Connect pin 1 at the
Macintosh end to the main ground on the computer.
2.11.2
Commodore 64, 64C, 128, VIC 20
Commodore and other manufacturers sell a signal level converter that is
installed in the User Port Connector on the rear of the computer. The
converter changes the computer's internal TTL voltage levels to the proper
RS-232-C voltage levels and polarities. Unless you are very familiar with the
inner workings of your computer, you should purchase a level converter rather
than trying to 'do it yourself.'
2.11.3
IBM PCjr
The PCjr uses standard RS-232-C voltage levels; however, the connector is not
standard and is sometimes hard to find. Pin-out information can be found in
the IBM PCjr Technical Reference Manual.
Some computer dealers sell an 'IBM PCjr Adapter Cable for Serial Devices' that
converts the connector on the PCjr to standard RS-232C. The cable is attached
directly between the PCjr and the PK-88. The cable is only about three inches
long; you may want to get a male-to-female RS-232C extension cable.
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2-18
INSTALLATION
PK-88 (DB25P)
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2
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PK88-36
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