HP Saturn (microprocessor) - Chipsets and Applications

Chipsets and Applications

The original Saturn CPU gave its name to the entire architecture. Later chips had their own code names:

CPU codename Used in calculator models Properties
Saturn HP-71B, HP-18C, HP-28C 640 kHz
Bert HP-10B, HP-20S, HP-21S 640 kHz, 10 KB ROM, 256 Bytes RAM, LCD driver
Sacajawea HP-14B, HP-22S, HP-32S, HP-32SII 640 kHz, 16 KB ROM, 512 Bytes RAM, LCD driver
Lewis HP-17B, HP-19B, HP-27S, HP-28S, HP-42S 1 MHz, 64 KB ROM, LCD driver, memory controller, IR control
Clarke HP-48SX, HP-48S 2 MHz, LCD controller, memory controller, UART and IR control
Yorke HP-48GX, HP-48G, HP-38G, HP-39G, HP-49G 3.68 MHz, LCD controller, memory controller, UART and IR control

The CPU codenames are inspired by members of the Lewis and Clark Expedition of 1804–1806, the first United States overland expedition to the Pacific coast and back.

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