The Measurement Computing CIO-INT32 is an ISA bus data acquisition board featuring two Zilog Z85C36 parallel I/O chips for flexible signal conditioning and control. It delivers up to 32 interrupt vector inputs, 40 configurable digital I/O lines, or six 16-bit counters—selectable via jumper configuration. All I/O signals connect through a 50-pin header, enabling direct integration into measurement, monitoring, and industrial automation systems. The board pairs with Universal Library software for multi-language Windows development and InstaCal for rapid deployment and diagnostics.
Technical Specifications
I/O Architecture
• Two Zilog Z85C36 parallel I/O chips
• 40 total digital I/O lines organized into 4×8-bit ports (A, B) and 2×4-bit ports (C)
• Per-bit or per-bank input/output configuration
• TTL signal levels: Output high 2.4 V min @ −250 µA, output low 0.5 V max @ +3.2 mA; input high 2.0 V min (7 V absolute max), input low 0.8 V max (−0.3 V absolute min)
• High-impedance reset state on power-up
Interrupt Handling
• 32 vector interrupt inputs
• Programmable triggering: bit change, pattern recognition, level, or edge modes
• Jumper-selectable sources: individual chip outputs, OR’ed outputs, external edge-triggered input, or disabled
• Interrupt priority selectable via jumpers (8536A over 8536B or none)
• IRQ levels 2–7 selectable; external INT ENABLE control (active low)
• Buffered interrupt outputs (INTA.OUT, INTB.OUT) at user connector
Counter Functions
• Six 16-bit counters based on Z85C36 architecture
• Independent or chained configuration (groups of three)
• Maximum clock input frequency: 3 MHz
• Clock pulse widths: 150 ns minimum high and low
• Trigger, source, gate, and output signals accessible at user connector
– Key Features
• Single 50-pin header connector for all I/O
• Jumper-configurable interrupt priority and level selection
• Dual-chip architecture supports mixed I/O and counter modes simultaneously
• TTL-compatible signal levels for direct peripheral interfacing
• Programmable per-bit or per-bank digital I/O direction
– Typical Applications
Real-time measurement and control, interrupt-driven data acquisition, multi-channel event counting, digital signal monitoring, and industrial automation systems requiring flexible I/O and timing functions.
– Compatibility & Integration
ISA bus interface. Universal Library software provides Windows programming support across multiple languages. InstaCal software simplifies installation and in-system verification.
