Hewlett-Packard 20-series Programmable Calculators
Hardware serie
The "20-series" were based on a common architecture and ACT chip (CPU) and media format.
Parent group
This is a container group; its children are:
| Hewlett-Packard HP-19C | A series of programmable hand-held scientific calculators. (too short) | 1975 / 1979 | 3 games |
| Hewlett-Packard HP-25 Programmable calculator | A cost reduced variant of the HP-65 lacking removable media and subroutines. (too short) | 1976 / 1979 | 14 games |
| Hewlett-Packard HP-29C | A series of programmable hand-held scientific calculators. (too short) | 1975 / 1979 | 3 games |
| Hewlett-Packard HP-67 | A series of programmable hand-held scientific calculators. (too short) | 1975 / 1979 | 52 games |
| Hewlett-Packard HP-97 | A series of programmable desktop scientific calculators. (too short) | 1975 / 1979 | 48 games |