Quick, beginner MASM register question - DX:AX

Posted by Francisco P. on Stack Overflow See other posts from Stack Overflow or by Francisco P.
Published on 2010-04-19T13:54:05Z Indexed on 2010/04/19 14:03 UTC
Read the original article Hit count: 610

Filed under:

beginner

|

masm

|

register

|

cpu-registers

|

assembly

Hello, I am currently studying for an exam I'll have on x86 assembly.

I didn't have much luck googling for ":", too common of a punctuation mark :/

IDIV - Signed Integer Division

Usage: IDIV src

Modifies flags: (AF,CF,OF,PF,SF,ZF undefined)

Signed binary division of accumulator by source. If source is a byte value, AX is divided by "src" and the quotient is stored in AL and the remainder in AH. If source is a word value, DX:AX is divided by "src", and the quotient is stored in AL and the remainder in DX.

Taken from "Intel Opcodes and Mnemonics"

What does DX:AX mean?

Thanks a lot for your time :)

© Stack Overflow or respective owner

Related posts about beginner

assembly registers beginner

as seen on Stack Overflow - Search for 'Stack Overflow'
So I've been getting into a bit of assembly lately and I'm a beginner so i was wondering if someone could clarify something. I take it every process has it's own set of registers, and each thread can modify these registers right?. How then do multiple threads use the same registers without causing… >>> More
Beginner learning assembly preserving esp after function calls

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm a beginner learning some assembly, when preserving the ESP register before a function call does it matter if you do it by adding or subtracting? hard to explain, consider the following mov esi, esp sub esp, 12 // on 32bit OS this would mean that there are 3 arguments to the function // push,… >>> More
I am a beginner to C and this is the dumbest question..Confused about getchar() function

as seen on Stack Overflow - Search for 'Stack Overflow'
Sorry if I am not supposed to post beginner level questions here..I am new to this site Please read the code below first I am confused about getchar() 's role in the following code.. I mean I know its helping me see the output window which will only be closed when I press enter key So getchar()… >>> More
Top 10 Reasons SQL Developer is Perfect for Oracle Beginners

as seen on Oracle Blogs - Search for 'Oracle Blogs'
Learning new technologies can be daunting. If you’ve never used a Mac before, you’ll probably be a bit baffled at first. But, you’re probably at least coming from a desktop computing background (Windows), so you common frame of reference. But what if you’re just now learning… >>> More
Would you recommend Head First Programming for someone new?

as seen on Programmers - Search for 'Programmers'
My brother is just starting out college. He's studying the same thing I am here in Bolivia; Systems Engineer which is the equivalent of what a CS degree is in the US. Being his big brother and a programmer myself I really want to guide him and give him the right material to learn and become good… >>> More

Related posts about masm

Using Visual Studio 2008 to Assemble, Link, Debug, and Execute MASM 6.11 Assembly Code

as seen on Stack Overflow - Search for 'Stack Overflow'
I would like to use Visual Studio 2008 to the greatest extent possible while effectively compiling/linking/building/etc code as if all these build processes were being done by the tools provided with MASM 6.11. The exact version of MASM does not matter, so long as it's within the 6.x range, as that… >>> More
tools in masm for files io

as seen on Stack Overflow - Search for 'Stack Overflow'
How can I operate on files in masm. I mean using standard libraries included to microsoft (masm). Or somethning available in windows without linkink libraries. >>> More
MASM StrCmp Undefined?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, If I try to assemble the following code, I get a A2006 error ( error A2006: undefined symbol : StrCmp). Here's my code: .386 .model flat,stdcall option casemap:none include \masm32\include\windows.inc include \masm32\include\kernel32.inc include \masm32\include\masm32.inc include… >>> More
reading a BYTE as a DWORD in Masm

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, once again I'm doing MASM programming. I'm trying to write a procedure using the Irvine32 library where the user enters a string which is put into an array of BYTEs with ReadString. Then it loops over that arrray and determines if each character is a number. However, when I try cmp [buffer +… >>> More
FASM vc MASM trasnlation problem in mov si, offset msg

as seen on Stack Overflow - Search for 'Stack Overflow'
hi folks, just did my first test with MASM and FASM with the same code (almos) and I falled in trouble. The only difference is that to produce just the 104 bytes I need to write to MBR in FASM I put org 7c00h and in MASM 0h. The problem is on the mov si, offset msg that in the first case transletes… >>> More