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Intel assembly in Debug to interact directly to hardware

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mhamini

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I need to do the following..
In Intel Assembly running on DEBUG, bypass OS system calls..
I need a system call that recives in register AH either 1 or 2 and ..
if 1, change the color of every position on the screen to randomly chosen patter
if 2, the system call receives, in BX, offset of address of a string supplied by user, in DL, screen attributes, in CX, the row (0-24), in CH, the column (0-79) and the string will be terminated by a character of choice. This function will display on CGA Screen, the string specified at the column and row with the attributes in DL.
Please Help..
 

to bypass system calls you have to build a device driver (assuming you are running on NT kernel, i.e. winNT/2K/XP). If you running on DOS or win98, it's possible to so directly without the aforementioned driver.
 

    mhamini

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