National Semiconductor 835
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The National Semiconductor 835 and Novus 835 are four function calculators produced by National Semiconductor. They are notable for using bubble led displays and being an early adopter of Chip-On-Board (COB) calculator ASICs. Like many other calculators produced by NS, the 835 was available in both a cream and brown colour scheme.
 A cream coloured National Semiconductor 835 | |
| Other names | Novus 835 |
|---|---|
| Introduced | 1976 [1] |
| Discontinued | 1978 |
| Calculator | |
| Entry mode | Infix |
| Display type | Bubble LED |
| Programming | |
| Programming language(s) | N/A |
| Other | |
| Power supply | 9V battery, 9V DC power supply |
| Power consumption | 225 to 540mW |
Internal design
When looking inside the calculator, it is quite clear that is designed to be low cost. The design consists of two boards, one for the keypad which is plastic riveted to the front case, and a second board that houses the ASIC and display module. An external power connector is included to power the calculator from an AC adapter.
