Additional Pictures 


The Main printed circuit board (PCB) of the HP-65 is centered around a HP-proprietary CPU module and supported
by 3 ROM chips manufactured by Mostek, electronics for the integrated card reader and power supply.

Close-up view of the custom-made CPU module with integrated RAM, external ROM and power supply.

horizontal rule

If you have additions to the above article please email:

Joerg Woerner, January 24, 2021. No reprints without written permission.