I have several computers Model HP9825A and HP9845B von Hewlett Packard. These computers are not a "home computer", but both were from the beginning a pioneering masterpiece of the Hewlett Packard company. Maintenance this computer in original state requires many spare parts. On the other hand, using original computer HP9825A and HP9845B is very difficult in these days. I have decided to completely convert one HP9825A and HP9845B into a new computers to be usable for many purposes of today. That is, a new CPU with memory, new power supply, etc.
On this website I publish from time to time result of my activity in this process. All schematic drawings and component locations on the circuit boards were created by me using EdwinXP CAE. The documents are available in PDF format and upon request in EdwinXP format. The ROM dump copies are available in binary format compressed to ZIP. On request are available in Intel or Motorola ROM format.

HP9845B

09845-66500 - Main Board

09845-66502 - Bus Backplane Board

09845-66526 - 128 kbyte RAM Board

09845-66527 - RAM/ROM Board

09845-66528 - RAM/ROM Board

HP9825A

Color LCD monitor for HP9825A/B

ROM board

Backplane board

Display board

Memory board

Memory option board

HP9816A

66514 rev.E - Mainboard

66561 rev.B - Bus board

98256 rev. D - 256kB RAM board

98257 rev. D - 1 MB RAM board