Pin | PrinterPort | Direction | Usage | Connection to: | Active H/L |
---|---|---|---|---|---|
1 | Data 8 | Out to radio | MC145106 pin 9 | HIGH | |
2 | Data 0 | Out to radio | MC145106 pin 19 | HIGH | |
3 | Data 1 | Out to radio | MC145106 pin 17 | HIGH | |
4 | Data 2 | Out to radio | MC145106 pin 16 | HIGH | |
5 | Data 3 | Out to radio | MC145106 pin 15 | HIGH | |
6 | Data 4 | Out to radio | MC145106 pin 14 | HIGH | |
7 | Data 5 | Out to radio | MC145106 pin 12 | HIGH | |
8 | Data 6 | Out to radio | MC145106 pin 11 | HIGH | |
9 | Data 7 | Out to radio | MC145106 pin 10 | HIGH | |
10 | ACK | In from radio | PTT Switch | Microphone connector Pin 3 | LOW |
11 | Busy | In from radio | Squelch Control | Souelch sircuit, IC1 pin 8 | LOW |
18 | Ground | Ground | MC145106 pin 20 |
Before modification | After modification |
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![]() To protect the PrinterPort: Cut the trace between IC706 and IC707 on the CPU- and PLL-board.... |
![]() and insert 9 pcs. 4,7kW resistors across the cutted traces. |
Connection to the PrinterPort | Squelch and PTT circuit |
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Connect a 4,7kW resistor to the SQ-circuit. Use also a 1N4148 or similar diode to protect the input fron the PTT-Switch. |
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