HP41C with Rp Pico attached

[blackjetrock]

(07-08-2023 07:57 PM)LEDfan Wrote:  That’s a really neat project. Being able to mirror the display is handy. I sold my HP-41C for parts as the display developed a big black splodge (but no obvious impact damage), and was partially illegible. I wonder how many this could potentially save.

As the code is currently written, it monitors the traffic between the CPU and display controller and displays a copy of what is on the LCD. So, yes, a broken LCD can be replaced by an OLED display (or some other with a few changes to drive it).
If, however, the display controller itself is broken then code would have to be written to fully emulate the display controller and take over the functions that it provides.

The Pico is fully capable of doing this as the HP41C is quite slow, so even if RAM or ROM is broken it should be possible for the Pico to emulate parts on the bus, even the CPU, but that would be a lot of work.

Andrew