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Additional Pictures 

 

This HP-45 Advanced Scientific Calculator was manufactured in December 1973 by
Hewlett Packard in the United States (Date code 1350A wk 50 yr 1973).

The Main printed circuit board (PCB) of the featured HP-45 is centered around the HP 1820-0078 Control and Timing Chip, the
HP 1818-0078 Arithmetic and Register Chip, two HP 1818-0057 and -0082 ROM Chips with a capacity of 256*10 bits, each
and a HP 1820-0993 RAM Chip in white ceramic packages supported by a HP Clock Driver and power supply.

The Display and Keyboard PCB of the HP-45 with two display drivers and three
7-segment LED-Display Modules with 5 digits, each.

Close-up view of the HP 1820-1169 Arithmetic and Register Chip, here manufactured by Mostek and marked as MK6020P.

Close-up view of the HP 1818-0078 Control and Timing Chip, here manufactured by AMI.

Close-up view of the two HP 1818-0057 and HP 818-0082 ROMs, here manufactured by AMI.



Close-up view of the HP 1820-0993 RAM, here manufactured by Mostek and marked as MK6036P.

Close-up view of the HP 1820-1128 Clock Driver and Reset Chip.

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

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

Close-up view of the HP 1820-1226 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, October 22, 2023. No reprints without written permission.