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INT 26 - DOS - ABSOLUTE DISK WRITE (except DOS 4.0/COMPAQ DOS 3.31 >32M partn)
        AL = drive number (0=A, 1=B, etc)
        DS:BX = Disk Transfer Address (buffer)
        CX = number of sectors to write
        DX = first relative sector to write
Return: CF set on error
            AL = error code issued to INT 24h in low half of DI
            AH = same error codes as for INT 25h
        CF clear if successful
            AL = 00h
Note:   ORIGINAL FLAGS ON STACK!  Must be popped or discarded by adjusting SP
BUG:    DOS 3.1 through 3.3 set the word at ES:[BP+1Eh] to FFFFh if AL is an
        invalid drive number
SeeAlso: INT 25, INT 13/AH=03h