Functions: ASMD, conversion factors

Technology: MOS-LSI (Rockwell A4004PC)

Display: 8 digits, vacuum fluorescent module

Dimensions: 75W x 145D x 35H, weight 250g.

Manufactured: Qualitron, Taiwan, 1975

The Qualitron 1438 is a basic four-function calculator with a range of pre-programmed conversion factors for distance, mass, volume, and temperature. Two slider switches select land or nautical miles, and US or Imperial volumes. There is provision to enter a single user-defined conversion factor.

The circuit board uses a Rockwell A4004PC processor (no relation to the Intel 4004), an Itron FG95A fluorescent display panel