HP Forum Archive 16

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HP-11c schematic? Message #1 Posted by Marta on 29 May 2006, 8:43 a.m. 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.

Re: HP-11c schematic? Message #2 Posted by Tony Duell on 29 May 2006, 1:42 p.m., in response to message #1 by Marta 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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