DATAMATH PICTURES

This Royal Model 90K (UA120) was manufactured in November 1975 in Japan.

The Royal Model 90K (UA120) is powered by four disposable 1.5 Volt batteries.

The Royal Model 90K (UA120) calculator with the frontside of its housing removed.

The printed circuit board (PCB) of the Royal Model 90K (UA120) is centered
around a NEC µPD943 single-chip calculator circuit.

Close-up view of the NEC µPD943 single-chip calculator circuit.

Close-up view of the FUTABA 9-ST-10 Vacuum Fluorescent Display (VFD).

Front- and backside of the keyboard assembly of the Royal Model 90K (UA120) calculator.

Close-up view of the date code located on the GICO keyboard assembly.