MFJ-1270C/1274C COMPUTER INTERFACING
Page 9
IBM PCjr
The PCjr uses standard RS-232C voltage levels for its serial interface; however,
the connector used is non-standard and not readily available from electronic
supply dealers. Pinout information for this connector is given in the IBM PCjr
Technical
Reference Manual.
IBM dealers sell the "IBM PCjr Adapter Cable for Serial Devices" for
converting the connector on PCjr to a standard RS-232C terminal connector.
This cable attaches directly between the MFJ TNC and the PCjr. It is only
about 3 inches long, however, so you may want to obtain a male-to- female RS-
232C extension cable, which should be readily available.
Radio Shack Color Computer
The Color Computer series (except for the Micro Color Computer) uses a 4-pin
DIN-style connector for its serial interface. Wire a cable as shown in Fig. 2-2 to
interface your MFJ TNC to a Color Computer. All necessary parts should be
available from Radio Shack dealers.
Color Computer DB-25P
4 2
2 3
3 7
Fig. 2-2
Serial port wiring for Radio Shack
Radio Shack Model 100/102 and NEC 8201
These computers have built-in standard RS-232C serial ports that are compatible
with the MFJ TNC . You will need a standard male-to-male RS-232C extension
cable to connect the computer to the MFJ TNC .
IBM PC/XT/AT/386/486 and compatibles Computer
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