National Instruments PXI-6508 96-Line Digital Input/Output PXI Card
Features

• 96 Static Digital I/O Lines (5 V/TTL)
• 8-Bit Ports
• 2-Wire Handshake Capability
• Known Power-up States
• Unidirectional and Bidirectional I/O

The National Instruments PXI-6508 offers 96-bit parallel DIO interfaces for PCI, PXI, and ISA. It is designed for 5 V TTL/CMOS I/O signals. The PXI-6508 contains 4 82C55 Parallel Port Interfaces (PPIs). Each PPI controls 24-bits of DIO and has 3 8-bit ports which can be configured as either input or output.

The PXI-6508 is flexible when interfacing to peripherals or other computers. It can operate in either a unidirectional or bidirectional mode and handshake with peripheral equipment. The PXI-6508 DIO lines can be powered up either high or low with each line connected to a 100 k. resistor.