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Saturn The Saturn processor

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A number of the Hewlett Packard LCD calculators are using a micro controller that is derived from the Saturn architecture. The Saturn architecture has a 4 bit data bus and a 20 bit address bus. For the Yorke processor the data bus is extended to 8 bits and the address bus reduced to 19 bits. A nice pdf document about the architecture of the Saturn processor can be downloaded here.

CODE Clock speed ROM RAM Display driver Remark Models    
Saturn
(1LK7)
640 Khz 0 0 none   HP-18C HP- 28C
HP-71B
 
Bert
(1LU7)
640 Khz 10KB 256B 7 Segment   HP-10B
HP-20S  
Sacajawea
(1LR3)
640 Khz 16KB 512B
Dot matrix
Character based
  HP-32SII
Lewis
(1LR2)
1 Mhz 64KB 0
Dot matrix,
108 drivers
Memory controller,
Infrared interface
HP-17BII HP-19BII
 
Clarke
(1LT8)
2 Mhz 0 0
Dot matrix,
108 drivers
Memory controller,
UART Infrared interface
HP-48SX  
Yorke 3.68 Mhz 0 0
Dot matrix,
108 drivers
Memory controller,
UART Infrared interface
 
HP-49G

 

William Clarke The code names refer to members of the famous Lewis and Clark Expedition, the first American expedition on land from the West coast to the East coast

Expedition

William Clarke
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Saturn related links:

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