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HP-42S

The HP-42S RPN Scientific is a programmable RPN Scientific hand held calculator introduced by Hewlett-Packard in 1988. It has advanced functions suitable for applications in mathematics, linear algebra, statistical analysis, computer science and... Wikipedia
Dimensions: 148×80×15 mm
Discontinued: 1995
Display size: 2 lines, 22 characters, 131×16 pixels
Entry mode: RPN
Firmware memory: 64 KB of ROM
Manufacturer: Hewlett-Packard
Power supply: 3×1.5 V button cell batteries (Panasonic LR44, Duracell PX76A/675A or Energizer 357/303)