LCD Screen Output (HP-49, 110+)

[Martin Hepperle]

Hello,

some members of the HP-38/48/49 family and the Portable Plus come with an LCD output connector. The connector carries a pixel clock signal and several data lines for parts of the display (display memory is often split into 2 (HP-49) or 4 (Portable Plus) parts).

I know that there was an overhead panel e.g. for the HP-49 available.

Has someone ever made an interface to display the screen content via these LCD interfaces on an external screen?

Nowadays we have high contrast LCD or even color TFT screens and it should be possible to create a secondary display of high quality and readability.
Due to the high pixel clock rate one would probably have to create an FPGA hardware solution, a cheap microprocessor solution (Arduino, Raspberry) will be too slow. Output could be a composite video signal or something like HDMI.

Would this be feasible?

Martin