National Instruments Low-Cost Multifunction I/O Board for ISA Lab-PC+ - Manual (Page 145)

Appendix D Register Map and Descriptions
© National Instruments Corporation D-29 Lab-PC+ User Manual
Counter B0 Data Register
The Counter B0 Data Register is used for loading and reading back the contents of 8253(B)
Counter 0.
Address: Base address + 18 (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 Counter B0 contents.