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DATAMATH CALCULATOR MUSEUM

Hewlett-Packard HP-65

Date of introduction:	January 19, 1974	Display technology:	LED
New price:	$795	Display size:	10 + 2
Size:	6.0" x 3.1" x 1.5"
Weight:	11.0 ounces	Serial No:	1333A14611
Batteries:	3*NiCd AA-size	Date of manufacture:	wk 33 year 1973
AC-Adapter:	HP-82002	Origin of manufacture:	USA
Precision:	10	Integrated circuits:	HP65-CPU, Mostek MK6111...MK6113
Memories:	9
Program steps:	100	Courtesy of:	Peter Muckermann

Hewlett-Packard introduced in January 19, 1974 with the HP-65 the first truly handheld programmable calculator. In a housing slightly larger than the HP-35 a card reader for tiny magnetic strips was accomodated. Users could store programs up to 100 steps lenght on the cards or buy pre-programmed cards from both Hewlett Packard or third party companies. The HP-65 was replaced after 2 years with the HP-67 featuring 224 merged program steps and 26 memories instead of 100 partially merged steps and 9 memories. Compare the specifications with the Texas Instruments SR-56 and SR-52.

The HP-65 uses the Reverse Polish Notation with the ENTER key instead the usual = key.

The internal view of the HP-65 gives a very solid construction.
The main printed circuit board with the huge CPU and three ROM's (Read Only Memories).

Learn more about Mostek Calculator Integrated Circuits.

If you have additions to the above article please email: joerg@datamath.org.