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   ocr: Pin Name Description/Notes 1 HSKO Output Handshake (from Zilog 8530 DTR pin) 2 HSKIExternal Clock Input Handshake (CTS) or TRXC depends on8530 mode) 3 TxD- Transmit Data line 4 Ground 5 RxD- Receive Data line 6 TxD+ Transmit Data line 7 Not connected 8 RxD+ Receive Data line; ground this line to emulate RS232