Offered is an original Cromemco QUADART S-100 bus serial interface board, marked QUADART 020-0043 Rev D. This is a classic Cromemco multi-port serial board designed for Z80-based S-100 systems and is a desirable piece for collectors and restorers building period-correct systems.

The board is populated with Zilog Z80A components and associated support ICs, along with the original regulator and heatsink assembly. All major components appear present and original. The board is clean overall with no signs of corrosion or battery damage.

Gold edge connector is in good overall condition contact marks from prior use.

Underside shows clean solder work with no obvious repairs or trace damage observed.

This is a visually strong example suitable for display, restoration, or integration into a working S-100 system.

Carefully packed with anti-static protection and rigid support.