dos - Writing to Shadow Memory? -

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I have to type F000: 0000 ~ FFFF: 0000 in real mode (dos).
But write this area - protected.

I tried to find the CPU and the Northbridge dataset.
But, I can not find the method of writing the shadow rams.

My System Configuration:
M / B: ASUS P5B (965 P Chipset)
CPU: Intel Pentium 4 Series

BIOS: AMI

F000: 0000 ~ FFFF: 0000 80286 The memory range is. You can read more on that.

To use it without HIMEM. You should do the following:

You can control the 8042 keyboard controller directly using Command D1 Type the output port: Port 60h written in the next byte 8042 is placed in the output port. 

  .286 mov al, 0d1h; Send commands to 64h out of 8042, al reloop: in al, 64 d; Check whether the Port 60H is available or AL, 02H JNJ Relapse Wax Al, 11100011B; The keyboard is working and out of A20 20A Al Push-1; Set SS = FFFH Pop AS Push 00H Pop DS; DS = Set 0000 h Mov di, 10h; Check whether this work has been done, Exercise C, C; FFF: 16 ​​bits CPX, D compared to 0010 H to 0000: 0000; Set CX to 10 HclDA Representative CMCSB; Compare this fail [...]; , Copy wire for us FFF: xxxx failed: jmp failed;

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