Scientific Calculator Keyboard Challenge II

[Hlib]

(03-18-2016 08:16 PM)compsystems Wrote:  .....
characteristics
0: [Alpha] an alphabetical key, if not separately included [a], [b], [c]
1: [Left Shift] & [Right Shift] Two keys change, to have more functions on a single key
2: [ESC] KEY with the option of "ON"
3: [NEXT] or [TAB] key to toggle between menus
4: [F1], ... [F6] Function Keys, minimum 6 vertical model, 8 horizontal model
5: [<-] key backspace, with the option of "clear" and "del"
6: keys [(] [)] separately
7: basic keys like [^] [=] [,] [.] [+/-] [SPACE]
8: Cursor key [<][>][v][^] , with the option of "|<" , "||<", ">|" ,">||", etc
9: [ENTER] enter key a little wider than the others, but not covering two keys
10: Others [CATALOG] [VARS] [HOME (NUM)] [HELP] [CAS]

I agree with all the points in the list. This is a logical way, derived from the requirements for a scientific calculator. Also add:
0: all menus must have no more than two pages with 8 items in each page (maximum) - for reasons of user convenience
1: one-two labels above the keys
2: add other functions depending on screen size, memory and your imagination
3: screen: size 240x64 (non graphic) or 240x160 (advanced) with three gray-scale levels (white-gray-dark)


http://s017.radikal.ru/i435/1603/2f/4d542a6f77da.jpg