I. Basic Specification

Full Name: 96-Channel, 5 V, TTL/CMOS, 2.5 mA Digital I/O Board

Bus: ISA (non-PCI), used in old industrial computers / industrial PCs

Channels: 96 bidirectional DIO, 5 V TTL/CMOS

Core: 4 pieces of 82C55 PPI (programmable peripheral interface), each 24 bits, divided into 3×8-bit ports

Usage: Equipment renovation, industrial automation, switch quantity control, relay / sensor interface

Current Status: Already discontinued, available in second-hand / refurbished form; replaced by PCI-6508 / PXI-6508

II. Core Parameters

✅ Channels and Logic

Total channels: 96 bidirectional DIO (4×24-bit PPI)

Logic level: 5 V TTL/CMOS

Input high: ≥2.0 V; Input low: ≤0.8 V

Output high: ≥3.0 V; Output low: ≤0.4 V

Drive capability: 2.5 mA/channel (pull / sink)

Input impedance: high impedance; Output: push-pull

✅ Port Structure (82C55)

4 PPI (U1~U4), each 24-bit = Port A/B/C (8 bits each)

Each port can be independently set as input/output; supports one-way / two-way / handshake mode

Supports 2-wire handshake (Handshaking), compatible with peripheral synchronization

✅ Physical and Interfaces

Connector: 100-pin high-density male connector (Robinson-Nugent)

Size: Standard ISA half-length card

Power supply: +5 V (ISA bus)

Operating temperature: 0 ℃ ~ +70 ℃

✅ Software and Timing

Timing: Software timing (non-hardware high-speed), suitable for slow digital switches

Driver: NI-DAQ (traditional), supports LabVIEW, C/C++, VB

System: Windows 95/98/NT/XP (legacy systems)

III. Key Features

✅ 96-channel high-density DIO, single card replaces multiple small cards

✅ 82C55 standard architecture, industry standard, mature programming

✅ Handshake and Interrupt: Supports input interrupt, event triggering

✅ Power-on state controllable, avoiding false actions

❌ No isolation: TTL direct connection, common ground design

IV. Common Confusion (PC-DIO-96 vs PCI-DIO-96)

PC-DIO-96: ISA bus, old model, 100-pin, discontinued

PCI-DIO-96: PCI bus, subsequent model, 100-pin, also discontinued

Replacement: NI PCI-6508 / PXI-6508 (96-channel TTL, PCI/PXI)