HP-9820A Full Algebraic Desktop Calculator 

• 1972 
• Desktop calculators 
• Hewlett-Packard 

The HP 9820 was the second programmable calculator from the HP 9800 series. The HP 9820 is a so-called algebraric programmable. The functions are expandable with ROM modules like all others in the 9800 series. All HP 9800 series machines share the same serial processor, which consists of 4 TTL boards. Other components such as memory and ROMs are different for all types, the HP 9810 and 20 do share the same card reader and printer.

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