# Apple Macintosh XL Serial A

25 PIN D-SUB CONNECTOR

Pin | Name | Description
--- | --- | ---
1 | GND | Ground
2 | TxD | Transmit Data line
3 | RxD | Receive Data line
4 | RTS | Request To Send
5 | CTS | Clear To Send
6 | DSR | Data Set Ready
7 | GND | Ground
8 | DCD | Data Carrier Detect
9 | n/c | Not connected
10 | n/c | Not connected
11 | n/c | Not connected
12 | n/c | Not connected
13 | n/c | Not connected
14 | n/c | Not connected
15 | TxC | Connected to TRxCA
16 | n/c | Not connected
17 | RxC | Connected to RTxCA
18 | n/c | Not connected
19 | n/c | Not connected
20 | n/c | Not connected
21 | n/c | Not connected
22 | n/c | Not connected
23 | n/c | Not connected
24 | TEXT | Connected to TRxCA
25 | n/c | Not connected

Contributor: Joakim Ögren

Source:
Technote HW19: Pinouts at Apple Technical Notes

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May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2000-07-09