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Additional Pictures
This Litton Royal Digital
III was manufactured
in December 1971 proudly in the United States of America. |
The Litton Royal Digital
III is powered by
six rechargeable NiCd batteries. |
The
Litton Royal Digital III calculator with the its housing removed. |
| The Main printed circuit board
(PCB) of the Litton Royal Digital III is centered around a General Instrument 250 single-chip calculator circuit.  |
The
Litton Royal Digital III used four unknown Vacuum Fluorescent
Displays (VFDs). |
The Power Supply
and Clock Module of the Litton Royal Digital III calculator. |
The
keypads and stylus of the Litton Royal Digital III calculator. |
Close-up view of the
General Instrument 250 single-chip calculator circuit. |
Close-up view of the
Display-PCB.  |
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, July 6, 2025. No reprints without written permission.