DATAMATH PICTURES

The sales box of the Bowmar "Brainchild" MX20 sold in 1974 in the US.

The Bowmar MX20 calculator with its integrated protective cover folded over the keyboard.

This Bowmar MX20 (90911) with Serial Number 195196 was manufactured in March 1974 in Mexico.

The Bowmar MX20 is powered by three disposable AA-sized Volts batteries.

The Bowmar MX20 calculator with the backside of its housing removed.

The Bowmar MX20 with the calculator assembly removed and the keyboard assembly visible.

The printed circuit board (PCB) of the Bowmar MX20 is centered around a TMS0801
single-chip calculator circuit and supported by four display driver chips.

Close-up view of the TMS0801 single-chip calculator circuit.

Close-up view of the ITT B6249 Digit Driver.

Close-up view of the Bowmar Optostic R7H-112-9A Module of an MX20 manufactured in March 1974.