Docs: The Amiga serial port

Different Amiga models' serial ports have different characteristics - this page tries to give comprehensive information about all variations of the Amiga's serial port.

*** Information currently not verified, use with caution! This page is work-in-progress - please add your experiences, know-how, corrections, contributions, ... by leaving a comment, so we can make this a comprehensive documentation. Thanks! ***

A500/600/1200/2000/3000/4000

built-in serial port:
- D-SUB25 plug, male
- RS-232 compatible level signals (-12/+12V)
- RS-232 compatible pinout (TxD, RxD, RTS, CTS, ...) with additional pins/signals
- WARNING: Pin 9: +12V Power
- WARNING: Pin 10: -12V Power

 1     ----     SHIELD GROUND (do not connect to GND)
 2     -->     TXD / transmit data
 3     <--     RXD / receive data
 4     -->     RTS / request to send
 5     <--     CTS / clear to send
 6     <--     DSR / data set ready
 7     ----     GND / system ground (do not connect to SHIELD GROUND)
 8     <--     CD / carrier detect
 9     -->     +12V DC (20 mA max)
10     -->     -12V DC (20 mA max)
11     -->     AUDO Amiga audio out (left)
12     ----     not connected / SPEED INDICATE
13     ----     not connected
14     ----     not connected
15     ----     not connected
16     ----     not connected
17     ----     not connected
18     <--     AUDI Amiga audio in (right)
19     ----     not connected
20     -->     DTR / data terminal ready
21     ----     not connected
22     <--     RI / ring indicator
23     ----     not connected
24     ----     not connected
25     ----     not connected

A1000

built-in serial port:
- D-SUB25 plug, female
- RS-232 compatible level signals (-12/+12V)
- RS-232 compatible pinout (TxD, RxD, RTS, CTS, ...) with additional pins/signals
- RS-232 "Ring Indicator" (RI, Pin 22) not present
- WARNING: Pin 14: -5V Power, 50mA
- WARNING: Pin 21: +5V Power, 100mA
- WARNING: Pin 23: +12V Power, 50mA

CD32

AUX port serial line:
- Mini-DIN plug, female
- TTL level signals (0/+5V)
- TxD and RxD only

Expansion port serial line:
- full serial port pinout available on internal expansion port
- (signal level?)

CDTV

- (?)

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History:
2017-11-04: added CDTV
2017-11-02: stub page published, added pinout & plug info

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Additional sources:
https://www.amigaforever.com/kb/13-105
http://www.verycomputer.com/2_b3538782d89e8f62_1.htm