Int 15 Fn D042  R - Intel Pentium Pro Bios Update - Read Bios Update Area  [-]

   AX = D042h
   BL = 03h
   ES:DI -> buffer for microcode update block (see #0457)
   ECX = two real-mode 64K scratchpad segments (upper and lower words)
   DX = segment of 64K scratchpad area for BIOS use
   SI = zero-based index number of update block to retrieve

Return: CF clear if successful
   CF set on error
   AH = status
       00h successful
       ES:DI buffer filled with 2048-byte update block
       86h not implemented
   AL = OEM error (if AH is not 00h or 86h, otherwise undefined)
       00h successful
Program: the Pentium Pro BIOS update allows the system BIOS or other software
     to install a microcode patch into the Pentium Pro processor

Notes: this API must be called from actual real mode, not V86 mode
   at least 32K stack space must be available when this function is called

See Also: AX=D042h/BL=00h,AX=D042h/BL=01h,AX=D042h/BL=03h