 HP-42S | |
| Type | Programmable scientific |
|---|---|
| Manufacturer | Hewlett-Packard |
| Introduced | 1988 |
| Discontinued | 1995 |
| Calculator | |
| Entry mode | RPN |
| Precision | 12 display digits (15 digits internally), exponent ±499 |
| Display type | LCD dot-matrix |
| Display size | 2 lines, 22 characters, 131×16 pixels |
| CPU | |
| Processor | Saturn (Lewis) |
| Programming | |
| Programming language(s) | RPN key stroke (fully merged) |
| Firmware memory | 64 KB of ROM |
| Program steps | 7200 |
| Interfaces | |
| Ports | IR (Infrared) printing |
| Other | |
| Power supply | 3×1.5 V button cell batteries (Panasonic LR44, Duracell PX76A/675A or Energizer 357/303) |
| Weight | 6 oz (170 g) |
| Dimensions | 148×80×15 mm |
The HP-42S RPN Scientific is a programmable RPN Scientific hand held calculator introduced by Hewlett-Packard in 1988. It is a popular calculator designed for science and engineering students.