HP41 extension ports pinout

[rprosperi]

(02-11-2019 08:51 PM)eried Wrote:  ...However I am just thinking on some super simplified interface where the ESP8266 handles everything. Imagine for example just copying a program in your PC transferred it to the calc like if you swiped a magnetic card on it

I see, wow that's aggressive, but it would simplify things on the device side. Perhaps the easiest approach is to somehow emulate (or use existent) 41 Extended memory in your new device that plugs into the port so that normal functions in the 41 can store and read programs and data. To be clear, by "easy" I mean easiest on the 41 side of things, where essentially no (or very minimal) software would be needed, but it still could exchange programs and data registers. Otherwise, you'll have to also write the 41-side MCODE for moving the data in and out.

Monte Dalrymple, creator of the 41CL, announced early work on a general purpose I/O board for 41 ports at HHC2018; you should check that out as it may be helpful as a kind of "middle-ware" for your planned device.