HP-11c schematic?


Does any have a schematic of the HP-11c? It's the connections between CPU and display/keyboard I want information about. The corresponding CPU-pins, keyboard matrix row/column and display connections.


There's a 16C schematic on the HPCC schematics CD-ROM. This is for the 'original' version with the flexible PCB carrying the 2 chips and the display, and a zebrastrip connector to a normal PCB for the keyboard.

I _think_ the original 11C and 12C are much the same with a different R2D2 (ROM/RAM/Display Driver) chip (different ROM contents).

If you contact Dave Colver (secretary@hpcc.org), and ask nicely, he might e-mail you the few pages for the 16C.

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