Honored Contributor
Honored ContributorI won't be able to help much. Here are a couple of ideas, since you have found calculator code why not edit the code to add the functions that you need? There is a shiftregister megafunction that you could instantiate and would need one for right and one for left. Then the kind of shift you would have to add the gating and controls for signed/unsigned, arithmatic/logical etc.
As far as the keyboard and display maybe you could use something like the B-Micro that has a USB interface to your PC so there may be a way to use the PC keyboard and display. Even if you had a full description of what you are building, I would be of little help because I am not skilled in VHDL. Wishing I could be of more help, Good Luck.
