Run your first assembly language program using MASM assembler at windows 7 (64 bit). Programming. ▫ Organization of processor . Good programming practice dictates comment on every line . Use microsoft macro assembler ( MASM). The Microsoft Macro Assembler (MASM) is a tool that consumes x86 assembly language programs and generates corresponding binaries.
|Published (Last):||18 April 2004|
|PDF File Size:||14.44 Mb|
|ePub File Size:||8.87 Mb|
|Price:||Free* [*Free Regsitration Required]|
Microsoft Macro Assembler 8.0 (MASM) Package (x86)
This is part of masm code for checking whether a string is a palindrome or not. It’s not mentioned where this code came from, but it’s incomplete e.
But we can piece it together:. So all this code does is display a message to the user prompting them to enter a string, terminated by a line feed 0dh and it reads the string in to location str.
It also provides the number of characters read in count. Where strcountand msg1 are defined aren’t given.
Assembly Program for Addition of Two 8 bit Numbers
The above piece of assembler does say all and nothing. It is probably ;rograms piece of code used by the Microsoft DOS, where the “int 21h” was the king of the entry points.
Once the “int 21h” returns, the actual character entered is stored in the low byte of the accumulator, that is AL.
At this point, the “cmp” instruction compares the AL with the fixed code 0Dh i. Since the comparison is made by a subtraction of AL minus 0Dh, the match would be successful when the result programa zero.
Assembly Programming Tutorial
But we can piece it together: DX to point to msg1 mov ds,ax mov dx,offset msg1 mov ah,09h ; Write the string pointed by DS: DX to stdout int 21h mov si,offset str ; Get the the destination string location, DS: SI ; Read a string in from the user, terminated by new line 0dh ; read: I really couldn’t say more, but there’s no “palindrome” checking at all in this snippet!
However, I’m a bit rusty and I could mistake. Mario Vernari 3, 20 I suppose so, but it’s not clear because there’s no a label named “next”. A label is an indentifier followed by a colon, as “read: Vijay Nirmal 2, 4 11 Sign up or log in Sign up using Google.
Sign up using Facebook. Sign up using Email and Password.