I have created full Documentation of the HP9845B Bus Backplane Board (Rev.E). Schematics were created in CAE system EdWin:

• Control Logic
• Input Buffer
• Output Buffer
• Edge Connector
• Bus Connectors

For this board is now Gerber files and Excellon file, The printed circuit board has four layers and is fully compatible to Hewlett Packard original board.

Fig. 1 - original board 09845-66502 Rev. E

Documents:

schematics

components location on PCB

connectors connections table