Int 16 Fn 8765  - At.com Version 8/26/87 - Api                             [U]

   AX = 8765h
   BX = 4321h
   CX = ??? or FFFFh
   if CX = FFFFh
       DX = number of event to remove or FFFFh

Return: ES:BX -> event record array (see #0531)
Program: AT.COM is a resident scheduler by Bill Frolik

Format of AT.COM event record:
Offset Size    Description (Table 0531)
 00h   BYTE    in-use flag (00h free, 01h in use, FFh end of array)
 01h   BYTE    day of date on which to trigger
 02h   BYTE    month of date on which to trigger
 03h   BYTE    trigger time, minute
 04h   BYTE    trigger time, hour
 05h   WORD    offset of command to be executed