- Trusted Seller National Instruments PCI-6503- Manufacturer: National Instruments
- Model: PCI-6503
 24 Bit Parallel Digital I / O Interface PCI Module NI 6503 devices are 24-bit parallel DIO interfaces for PCI, PCMCIA, and ISA. All NI 650x devices are designed for 5 V TTL/CMOS I/O signals. Cary, NC

