Programming :: Cannot Edit B800:0000 In Pure Dos

Nov 11, 2010

I write the below sample program named "h1.asm"?

Code:

assume cs:code
code segment
mov ax,0B800H

[code]...

1. In Windows platform +MASM 5.0, run "command" and use "debug.exe" to see what would happen. As step by step check, I see B800:000 is not modified as expected.

2. In Ubuntu 10.04 + dosemu 1.4.0.1, run the program in two ways:

a. If exec dosemu in command line as "$dosemu -dumb", yes, it's in shell mode. and then use debug to check, "B800:0000" can be modified as expected.

Code:

"Welcome to dosemu 1.4.0.1!"
D:masm>debug h1.exe
-r
AX=0000 BX=0000 CX=000F DX=0000 SP=0000 BP=0000 SI=0000 DI=0000

[code]....

b. If exec dosemu in command line as "$dosemu", and run the program again, the symptom is as same as 1.(pls see attachment picture).

3. In Windows, I replace "mov ax,0B800H" to "mov ax,2000H" and try again, it would be edited well. So I wonder if it is coursed by "B800" segment address.

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[code]....

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[code].....

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[code]....

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Code:
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[Code]....

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Code:

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[code]....

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Code:

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[code].....

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