National Instruments Low-Cost Multifunction I/O Board for ISA Lab-PC+ - Manual (Page 150)

Register Map and Descriptions Appendix D
Lab-PC+ User Manual D-34 © National Instruments Corporation
Port A Register
Reading the Port A Register returns the logic state of the eight digital I/O lines constituting
Port A, that is, PA<0..7>. If Port A is configured for output, the Port A Register can be written
to in order to control the eight digital I/O lines constituting Port A. See Programming the Digital
I/O Circuitry in Appendix E, Register-Level Programming, for information on how to configure
Port A for input or output.
Address: Base address + 10 (hex)
Type: Read-and-write
Word Size: 8-bit
Bit Map:
7 6 5 4 3 2 1 0
D7 D6 D5 D4 D3 D2 D1 D0
Bit Name Description
7-0 D<7..0> 8-bit Port A data.