Pins 9 and 10 are used for external power on the Amiga. Connect these pins ONLY if the device you are using requires power.
The Commodore A2232 does not pass the 12V, or Audio lines.
DB 25-pin Male : Looking at female port on back of machine
Pin Amiga RS232 Description 1 SHIELD GND SHIELD 2 TxD TxD Transmit Data 3 RxD RxD Receive Data 4 RTS RTS Request To Send 5 CTS CTS Clear To Send 6 DSR DSR Data Set Ready 7 GND GND Ground 8 DCD DCD Carrier Detect 9 +12V +12V Carrier 10 -12V -12V Carrier 11 AUDO Audio Out Of Amiga 12 S.SD Speed Indicate 13 S.CTS 14 S.TXD 15 TXC 16 S.RXD 17 RXD 18 AUDI Audio Into Amiga 19 S.RTS 20 DTR DTR Data Terminal Ready 21 SQD 22 RI RI Ring Indicate 23 SS 24 TXC1 25 Please note, A1000 has -14VDC on pin 14, +5VDC on pin 21, and +12VDC on pin 23.