Hewlett Packard HP-22

Serial Number 1512A21374: 1975, 12th week, America
Accessories Pouch

Manual: HP-22 Owner's Manual, Sep 1975, bound printout from the MoHPC CD-ROM
Condition Excellent!
Repairs 15.10.2002 Initially, the top segment of the 4th display digit from left was not functioning! I swapped the display module from the HP-21 and verified that indeed the module rather than a driver on the circuit board is broken.
With the new display the unit is now fully functional.
26.2.2003 Soldered small wires to the battery contacts to get a more reliable contact when using regular AA cells in a battery pack.
Acquired 2.10.2002
HP codename, series Turnip, Woodstock
Type, Precision, Input Mode Business, 10 BCD digits, exponent 99, Reverse Polish Notation
Programmable No
Memory 10 storage memories, not permanent
Display 11 digit 7 segment red LED plus sign
Special features
Original Pricing, Production 1.9.1975 ($165) - 1.5.1978 ($125)
Batteries 2x AA pack or power supply
Dimensions Length 12.7cm, Width 6.5cm, Height 2.9cm
Links HP-22 Owner's Handbook, Sep 1975 (PDF)
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