While I was searching back to 2019 for threads I have started and whether there is any squirrel in them, I nevertheless found this.
https://www.subsim.com/radioroom/sho...d.php?t=242796
That is the original MM-IV software,. just runnign on nowadays suoerfats hardware. Back the n it never calculated 16 halfmoives (it slimit) ahead, and woukd ahve needed days and night for it if it had the memory (it was an 8 bit CPU and 32 MB RAM...). today oyu enter oyur mvoe, and two seconds later it has done those 16 halfmoves... The interface worked via mouse pointer and the buttons in the bottom left corner (no drag and drop of the symbols). I find this cool although i have the real machine.
The computer submarine game by Parker, Codename: Sector, from the late 70s, also has such an emulator with an orginal display of the hardware interface in that game.