Since 1980, Hewlett Packard introduced a series calculators with the series name Pioneer. This series counts 11 models with equal size and keyboard layout. These models can be arranged into three groups, ordered by the used processor. All three processors are derivatives from the basic Saturn concept, which is also used in the Champion and early Charlemagne models.

Model | Code | Type | Input mode | |
---|---|---|---|---|

HP-10B | Ernst | Business | Algebraic | |

HP-14B | Midas | Business | Algebraic | |

HP-17B | Trader | Business | Algebraic | |

HP-17BII | Trader II | Business | Algebraic & RPN | |

HP-20S | Erni | Scientific | Algebraic | |

HP-21S | Monte-Carlo | Scientific | Algebraic | |

HP-22S | Plato | Scientific | Algebraic | |

HP-27S | Mentor | Scientific | Algebraic | |

HP-32S | Leonardo | Scientific | RPN | |

HP-32SII | Nardo | Scientific | RPN | |

HP-42S | Davinci | Scientific | RPN |

The table below shows the differences between the three Saturn processors used in the Pioneer series. The LCD display of the Pioneer calculator simply betrays which processor is used.

Processor | RAM | ROM | LCD Interface | Models |
---|---|---|---|---|

Bert | 256 | 10K | 12 digit 7 segment | HP-10B, HP-20S, HP-21S |

Sacajawea | 512 | 16K | 12 digit 5x7 dot matrix | HP-14B, HP-22S, HP-32S and the HP-32SII |

Lewis | 0^{1} |
64K | 108 pins dot matrix driver | HP-17B, HP-17BII, HP-27S and the HP-42S |

^{1} The Lewis processor has no internal RAM memory but instead
it has an 16 bit address bus and 8 bit data bus memory interface to control
up to 64K of SRAM.

The picture below shows the Sacajawea processor found in an HP-32SII calculator. The chip is mounted in a hole in the PCB.

The next series of pictures show the different display typed used for the Pioneer series.

12 digits 7 segment display |
12 digits 5x7 dot matrix display version 1 |

12 digits 5x7 dot matrix display version 2 |
132x16 dot matrix display maximum 2 x 22 characters |

Of the 12 digit 5x7 dot matrix display two versions are known. The version 1 has a smaller character height compared to the later version 2 display. The version 1 displays are used in the HP-14B and the first series of the HP-32S. Later models of the HP-32S and its successor, the HP-32SII, used the version 2 display.

All Pioneer calculators have the same keyboard layout with 37 keys. The key labels are different for each calculator model.

From a sparse looking HP 17B keyboard. |
To a very busy HP 32SII keyboard. |

For some models different label color combinations have been fabricated. See the HP- 10B ,HP-20S and the HP-32SII calculator.

The size of this famous calculator series is 5,85” x 3.15” x 0.6”. This is about 147 x 78 x 15 mm.

A small change for a few models was the reduction of the number of rubber feet. The four small feet in the older series are replaced by two wider feet for the newer models

The Pioneer calculators are supplied by three LR44 or SR 44 button cells.

Two different soft covers of the Pioneer calculators. |

Hard cover for the Pioneer calculator. |

Thermal printer |

For those who are curious how an HP-32II looks inside: A Pioneer opened.