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Register-Level Programming Chapter 4
PC-DIO-96 User Manual 4-2 © National Instruments Corporation
Register Map
The following table lists the address map for the PC-DIO-96.
Table 4-1. PC-DIO-96 Address Map
Register Name Offset Address Size Type
(Hex)
82C55A Register Group
PPI A
PORTA Register 00 8-bit Read-and-write
PORTB Register 01 8-bit Read-and-write
PORTC Register 02 8-bit Read-and-write
CNFG Register 03 8-bit Write-only
PPI B
PORTA Register 04 8-bit Read-and-write
PORTB Register 05 8-bit Read-and-write
PORTC Register 06 8-bit Read-and-write
CNFG Register 07 8-bit Write-only
PPI C
PORTA Register 08 8-bit Read-and-write
PORTB Register 09 8-bit Read-and-write
PORTC Register 0A 8-bit Read-and-write
CNFG Register 0B 8-bit Write-only
PPI D
PORTA Register 0C 8-bit Read-and-write
PORTB Register 0D 8-bit Read-and-write
PORTC Register 0E 8-bit Read-and-write
CNFG Register 0F 8-bit Write-only
8253 Register Group
PORTA Register 10 8-bit Read-and-write
PORTB Register 11 8-bit Read-and-write
PORTC Register 12 8-bit Read-and-write
CNFG Register 13 8-bit Write-only
Interrupt Control
Register Group
Register 1 14 8-bit Write-only
Register 2 15 8-bit Write-only