Apple Macintosh XL Serial B connector

#Computer#Serial Interfaces#Apple
25 pin D-SUB MALE connector pin-out & layout

25 pin D-SUB MALE connector

PinNameDescription
1GNDGround
2TxD-Transmit Data line
3RxD-Receive Data line
4n/cNot connected
5n/cNot connected
6HSK/DSRTRxCB or CTSB
7GNDGround
8n/cNot connected
9n/cNot connected
10n/cNot connected
11n/cNot connected
12n/cNot connected
13n/cNot connected
14n/cNot connected
15n/cNot connected
16n/cNot connected
17n/cNot connected
18n/cNot connected
19RxD+Receive Data line
20TxD+/DTRConnected to DTRB
21n/cNot connected
22n/cNot connected
23n/cNot connected
24n/cNot connected
25n/cNot connected

Apple Macintosh XL Serial A connector

Apple serial NB card connector