DATAMATH PICTURES

The sales box of the Bowmar Brainchild MX25 sold in 1974 in the US.

The Bowmar MX25 calculator with its integrated protective cover folded over the keyboard.

This Bowmar MX25 with Serial Number 219722 was manufactured in July 1974 in Mexico.

The Bowmar MX25 is powered by three disposable AA-sized Volts batteries
or an optional rechargeable battery pack.

The Bowmar MX25 calculator with the backside of its housing removed.

The Bowmar MX25 with the calculator assembly removed and the keyboard assembly visible.

The printed circuit board (PCB) of the Bowmar MX25 is centered around a TMS0803
single-chip calculator circuit and supported by four display driver chips.

Close-up view of the TMS0803 single-chip calculator circuit.

Close-up view of the ITT B6249 Digit Driver.

Close-up view of the ITT B6370 Segment Driver soldered in place of the B6248 chip.

Close-up view of the Bowmar Optostic R7H-112-9A Module of an MX25 manufactured in July 1974.