WHERE OLD COMPUTERS ARE WELCOME
| Name | HP 21 |
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| Manufacturer | Hewlett-Packard (USA) | Type | Calculator |
| Production start (mm-yyyy) | 2 - 1975 | Production end (mm-yyyy) | 5 - 1978 |
| RAM | ROM | ||
| CPU | - Not assigned - - Mhz | ||
| Operating System | |||
| Text (Cols x Rows) | |||
| Graphics | |||
| Sound | |||
| Storage memory | |||
| Serial port | Parallel port | ||
| Others port | |||
| Original price | Currency original price | ||
| Units sold | |||
| Note | |||
| Configurations | Scientific Calculator | ||
| User | Alessandro Liberalato | ||
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