Int D4 Fn 29  - PC-mos/386 V5.01 - Write Control Block Data Into Scb Or T  [O]

   AH = 29h
   BX = offset into control block at which to start writing
   CX = number of bytes to write
   DX = segment/selector of control block obtained via AH=26h or AH=27h
   DS:SI -> buffer containing data to be written

Return: CF clear if successful
   CF set on errro
       AX = error code (see also INT 21/AH=59h)
       05h access denied due to an invalid segment/selector

Note:   this function performs no bounds checking
Program: PC-MOS/386 is a multitasking/multiuser MS-DOS-compatible operating
     system by The Software Link, Inc.

See Also: AH=26h,AH=27h,AH=28h,AH=2Ah