Compaq Portable 286 Compaq Portable Computer, Compaq Plus Personal Computer, a - Page 123
EIA OFF - 12V Option, Table 8.9-2. 25 Pin Parallel Connector
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+ Receive current loop data (20 mA) 17 No Connection 18 Data Terminal Ready (DTR) 19 No Connection 20 Ring Indicator (RI) 21 * EIA ON + 12V Option 22 * EIA OFF - 12V Option 23 - Receive current loop return (20 mA) 24 * Pins 23 and 24 - No connection on the full height Serial Interface Board. Table 8.9-2. 25 Pin Parallel Connector Signal Names and Description Pin Number Strobe 1 Data Bit 0 2 Data Bit 1 3 Data Bit 2 4 Data Bit 3 5 Data Bit 4 6 Data Bit 5 7 Data Bit 6 8 Data Bit 7 9 Acknowledge 10 Busy 11 Paper End 12 Select 13 Auto Feed 14 Error 15 Initialize Printer 16 Select Input 17 Signal Ground 18 - 25
+ Receive current loop data (20 mA)
17
No Connection
18
Data Terminal Ready (DTR)
19
No Connection
20
Ring Indicator (RI)
21
* EIA ON + 12V Option
22
* EIA OFF - 12V Option
23
- Receive current loop return (20 mA)
24
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* Pins 23 and 24 - No connection on the full height Serial Interface Board.
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Table 8.9-2. 25 Pin Parallel Connector
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Signal Names and Description
Pin Number
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Strobe
1
Data Bit 0
2
Data Bit 1
3
Data Bit 2
4
Data Bit 3
5
Data Bit 4
6
Data Bit 5
7
Data Bit 6
8
Data Bit 7
9
Acknowledge
10
Busy
11
Paper End
12
Select
13
Auto Feed
14
Error
15
Initialize Printer
16
Select Input
17
Signal Ground
18 - 25
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