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assembly language program

I need help with completing the following specification for an assembly language program. This is a practice question. This is part of an overall assignment that I am stuck at.

The program needs to check the current disk drive and report:

? The drive letter which would normally be assigned by DOS
? The amount of used space on the disk
? The amount of free space on the disk
? An indication that disk reorganisation is advised if the free space falls below 10% of the total available space.

Any naming conventions for program labels, sub-programs, variable names etc can be used.

Please could each line in the source code be documented with a remark explaining what it does so that I can understand it.

I would like the program to include:

? Data transfer
? Arithmetic & logical operations
? Conditional and unconditional branching
? Immediate, direct and indexed memory addressing
? Sub-programs, macros and function calls
? The program once assembled should operate as a .COM file

Thanx this will be a great help in trying to understand this.

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An assembly language program is devised.