Pinouts of Connectors

Apple Macintosh XL Serial B connector pinout

layout
schematic diagram
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25 pin D-SUB MALE connector pin-out & layout
25 pin D-SUB MALE connector
Pin Name Description
1 GND Ground
2 TxD- Transmit Data line
3 RxD- Receive Data line
4 n/c Not connected
5 n/c Not connected
6 HSK/DSR TRxCB or CTSB
7 GND Ground
8 n/c Not connected
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 n/c Not connected
16 n/c Not connected
17 n/c Not connected
18 n/c Not connected
19 RxD+ Receive Data line
20 TxD+/DTR Connected to DTRB
21 n/c Not connected
22 n/c Not connected
23 n/c Not connected
24 n/c Not connected
25 n/c Not connected

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25 pin D-SUB FEMALE connector pin-outs & layouts
25 pin D-SUB FEMALE connector
Pinouts.ru > Pinouts of serial ports >  Pinout of Apple Macintosh XL Serial B connector and layout of 25 pin D-SUB MALE connector and 25 pin D-SUB FEMALE connector

Source(s): Technote HW19: Pinouts at Apple Technical Notes, from Hardware Book
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