MS-DOS 1.27

According to MS-DOS 2.11 source code, MS-DOS 1.27 is an unreleased internal version of MS-DOS.

Change log
1.27 03/31/82 Installable device drivers Function call 47 - Get pointer to device table list Function call 48 - Assign CON AUX LIST 04/01/82 Spooler interrupt (INT 28) added.