The key determined by the combination of nCODE1 and nCODE2 is assigned to controller cA. You can assign multiple menu items and keys to the one controller, for example most game functions like save, restore, quit etc. usually have both a menu item and a key.
To assign a key by it's ASCII code, set nCODE1 to the ASCII code you need (these can be obtained from an ASCII chart) and leave nCODE2 as 0. There are a few special codes:
nCODE1 Key 26-Jan CTRL-A-Z 8 Backspace (CTRL-H) 9 Tab (CTRL-I) 13 Enter (CTRL-M) 27 Esc 32 Space
However, there are some keys and key combinations which use extended codes. For these, nCODE1 should be 0 and nCODE2 should be one of the values listed below (these are all standard PC-Keyboard codes, taken from the Epson GW-BASIC 3.20 manual.)
nCODE2 Key 3 CTRL-@ 15 SHIFT-TAB 16-25 ALT-Q W E R T Y U I O P 30-38 ALT-A S D F G H J K L 44-50 ALT-Z X C V B N M 59-68 F1-F10 71 HOME* 72 UP* 73 PAGE UP* 75 LEFT* 77 RIGHT* 79 END* 80 DOWN* 81 PAGE DOWN* 82 INS 83 DEL 84-93 SHIFT-F1-F10 94-103 CTRL-F1-F10 104-113 ALT-F1-F10 115 CTRL-LEFT 116 CTRL-RIGHT 117 CTRL-END 118 CTRL-PAGE DOWN 119 CTRL-HOME 120-131 ALT-1 2 3 4 5 6 7 8 9 - = 132 CTRL-PAGE UP 133-134 F11 F12** 135-136 SHIFT-F11 F12** 137-138 CTRL-F11 F12** 139-140 ALT-F11 F12**
* - These codes can not actually be assigned as they are used for moving ego around, but were listed here for completeness.
** - I was not able to get these codes to work.
Setting Up Menus and Keys