Int 66 Fn 40 - Pendos - Pkeyus - Get Version [n] AH = 40hReturn: CF clear AX = 0000h BH = major version (02h for version bundled with IBM DOS 6.1) BL = minor version (00h for version bundled with IBM DOS 6.1) DL = ??? (4Eh) DH = ??? (0Eh)