HP Saturn
family of 4-bit datapath, nibble serial, CISC, calculator, pocket computer and printer general purpose processors with 20-bit addressing capabilities and 64-bit general purpose registers
en-GB/ˌeɪt͡ʃˈpiː ˈsætən/
en-US/ˌeɪt͡ʃˌpi ˈsædɚn/
family of 4-bit datapath, nibble serial, CISC, calculator, pocket computer and printer general purpose processors with 20-bit addressing capabilities and 64-bit general purpose registers