Abaco Systems / VMIC VMIVME-2528-110 128-bit TTL Digital Input/Output Board

The Abaco Systems / VMIC VMIVME-2528-110 is a 128-bit TTL digital I/O board engineered for VMEbus systems requiring high-density interfacing of digital devices and sensors. Packaged in a double Eurocard (6U) form factor, this board delivers 128 individually configurable I/O points across sixteen 8-bit ports, each addressable on 8- or 16-bit boundaries. The architecture supports both non-privileged and supervisory short I/O transfers, with twelve DIP switches enabling flexible address map selection within the short data I/O space.

Technical Specifications

• I/O Channels: 128 TTL-compatible input/output points organized as sixteen 8-bit ports


• Data Transfer: 8-bit and 16-bit transfers supported


• Form Factor: Double Eurocard (6U) per VMEbus specification (ANSI/IEEE STD 1014-1987, IEC 821, IEC 297)


• Output Current Sink: 24 mA


• Output Current Source: 6.5 mA


• I/O Connector: 64-pin DIN 41612 with alternating ground pins


• Operating Temperature: 0 to 55 °C


• Logic Configuration: High-true or low-true selectable; individual port direction controlled via jumpers


• Power-up Behavior: All outputs initialize in tristate mode; any write to the final port releases tristate

Key Features

• Individual port direction control jumpers for flexible input/output assignment


• Twelve DIP switches for unlimited short address map configuration


• Real-time loopback functionality for diagnostic and verification use


• Tristate management with automatic release on first port write


• Addressable to any location within short supervisory or short non-privileged I/O map

Typical Applications

• Industrial automation and process control


• High-channel-count data acquisition systems


• Digital sensor and device interfacing


• VMEbus-based instrumentation and test systems

Compatibility & Integration Drop-in replacement for GE / Abaco VMIVME-2528. Fully compatible with VMEbus architectures conforming to ANSI/IEEE STD 1014-1987, IEC 821, and IEC 297 specifications.