This project started 1.Sep 2025 and is in progress. The goal is to create an educational single-board computer with two 4½-digit voltmeters with differential inputs, DSP, and ISA bus. This SBC with voltmeter is compatible with our other project: SBC based 80C535 with GPIB interface.

9.Oct 2025:  the PCB design was finished, fabrication files were generated and checked. The board is ready for production.

Documentation

• user and programming manual (pdf)
• schematics & BOM (pdf)
• printed circuit board - gerber and excellon files (zip)
• firmware, software examples (zip)

Fig.1 - components layout on final board

Fig.2 - top copper layer in ViewMate. The board has 4 layers.