Compaq Portable 286 Compaq Portable Computer, Compaq Plus Personal Computer, a - Page 121

Output Connector Pin, Portable and COMPAQ PLUS Video Display Controller Board.

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3-14, 4-13: 20 mA current loop operation When changing the COM1/COM2 address of the serial port, both jumpers J702 and J703 must be changed to correctly select the option desired. If COM1 is selected, the IRQ4 must be selected. IF COM2 is selected, the IRQ3 must be selected. Chapter 8.9 Output Connector Pin The following tables provide the output connector pin assignments: o Table 8.9-1: 25 pin asynchronous connector o Table 8.9 2: 25 pin parallel connector o Table 8.9-3: 9 pin serial connector Figure 8.9-1 shows the locations of the output connectors on the COMPAQ Portable and COMPAQ PLUS Video Display Controller Board. Figure 8.9-2 shows the location of the output connectors on the COMPAQ PORTABLE 286 Diskette/Tape Controller Board.

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3-14, 4-13:
20 mA current loop
operation
==============================================================================
When changing the COM1/COM2 address of the serial port, both jumpers J702 and
J703 must be changed to correctly select the option desired. If COM1 is
selected, the IRQ4 must be selected. IF COM2 is selected, the IRQ3 must be
selected.
Chapter 8.9 Output Connector Pin
The following tables provide the output connector pin assignments:
o Table 8.9-1: 25 pin asynchronous connector
o Table 8.9 2: 25 pin parallel connector
o Table 8.9-3: 9 pin serial connector
Figure 8.9-1 shows the locations of the output connectors on the COMPAQ
Portable and COMPAQ PLUS Video Display Controller Board.
Figure 8.9-2 shows the location of the output connectors on the COMPAQ
PORTABLE 286 Diskette/Tape Controller Board.