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Additional Pictures 

 

This HP-35 Scientific Calculator was manufactured in January 1973 by
Hewlett Packard in the United States (Date code 1302A wk 02 yr 1973).

The HP-35 is powered by 3 AA-sized rechargeable batteries.

The Main printed circuit board (PCB) of the featured HP-35 is centered around the HP 1818-0012 Control and Timing Chip and the
HP 1820-0848 Arithmetic and Register Chip in white ceramic packages and the three ROM Chips with a capacity
of 256*10 bits, each in their round, 10-pin TO99 Metal can packages and supported by a HP Clock Driver and power supply.

The Display and Keyboard PCB of the HP-35 with two display drivers and three
7-segment LED-Display Modules with 5 digits, each.

Close-up view of the HP 1820-0848 Arithmetic and Register Chip, here manufactured by AMI.

Close-up view of the HP 1818-0012 Control and Timing Chip, here manufactured by Mostek and marked as MK6021P.

Close-up view of the three HP-1818-0024 (MK6023L), HP 1818-0026 (MK6024L) and HP 1818-0029 (AMI) ROMs.

Close-up view of the HP 1820-0855 Clock Driver Chip.

Close-up view of three HP 1990-0335 5-digit 7-Segment LED Modules .

Partial Close-up view of the HP 1820-1029 Anode Driver and System Clock Chip.

Partial Close-up view of the HP 1820-1061 Display Scanning and Cathode Driver Chip.


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

Joerg Woerner, August 26, 2023. No reprints without written permission.