Assembly Ibm

Assembly Ibm
Assembly Ibm
assembly language question?

Here is an example in a book named assembly language programming for the ibm pc family. exercises 4.1 pg 65. If you don't have the book this are the instructions.
fill in the blanks with the values resulting from the following code. Use exactly four hex digits for each value.

mov ax, 0FFFFh
inc al ; ax = FF00h

i understand this question but the following ones i don't i need i clear explanation of how to do it please because the assignment consist of a total of 20.

mov ax, 1234h
sub ax, 35h ; ax = 11FFh
mov ax, 1234h
sub al, 35h ; ax= 12FFh
i need to now how are they converting the 35h and also my understanding is that 1234h means hex but what is the value in letters and how do i get it.

hex is base 16. So 0-9 is the same as decimal The difference are the values for 10-15.
A=10
B=11
C=12
D=13
E=14
F=15

1234h would be 1x(16^3)+2x(16^2)+3x(16)+4.

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Thanks for visiting!

Mike posted at 2008-6-3 Category: Computer Components