I have a binary chunk of data 512 bytes long, I was wondering what the most efficient way would be if I wanted to shift it once to the right. My best guess right now (very new to assembly) would be that I would have to first check a chunk (probably int) to see what it would shift out, shift, then carry in whatever the previous int would...
In principle, squaring the value of a register isn't hard: mov ax, [var] mov cx, [var] mul cx // square of answer is in DX:AX But I got to thinking -- the course that I'm learning Assembly for prizes efficiency very highly; a difference of even a single line less could be worth up to 5 points. I realize this is micro-optimiza...
Edit: Answered my own question. See below. -_- I have a variable defined in the .data segment as follows: retVal DW 0100h ;stores hex fraction of the intermediate value. Starts at 1.00 This is the value that I add or subtract to to get my return value. The first time it shows up in the code segment is at the following point: sub [...
I have a pointer to an array, DI. Is it possible to go to the value pointed to by both DI and another pointer? e.g: mov bl,1 mov bh,10 inc [di+bl] inc [di+bh] And, on a related note, is there a single line opcode to swap the values of two registers? (In my case, BX and BP?) ...
Is there any list of the hardware interrupts? i was coding a 16-bit app and i wanted to check some INTs but, i couldnt find anything usefull in google, can any1 provide me some docs about it? if possible, with details. Im sorry if its not a valid request but, its the only place that suits this question i think Thanks in advance ...
I always wanted to learn 8086 assembly but was (and am) a little confused on where to start. We are learning PIC16F690 at the moment in school and I'm good at it. So I guess I can give 8086 a try. I'm wondering is there an IDE for 8086 like MPLAB IDE where in it you can write code and execute instructions line by line and watch memory, r...
write a 8086 program to conver binary to gray code representation. plz help............ ...
Why can't we move data directly from a memory location into another memory location. Pardon me if I am asking a dumb question, but I think this is a true situation, at least for the ones I've encountered (8085,8086 n 80386) I am not really looking for a solution for moving the data (like for eg, using movs n all), but actually the rea...
Hi, I have a problem with the MASM32 assembler The following code is a Hello World example that I copied from the MASM32 tutorial: .model small .stack .data message db "Hello world!", "$" .code _main proc mov ax,seg message mov ds,ax mov ah,09 lea dx,message int 21h mov ax,4c00h int ...
I am reading the book The Art of Assembly Language. I came across this paragraph. To determine a particular instruction’s opcode, you need only select the appropriate bits for the iii, rr, and mmm fields. For example, to encode the mov ax, bx instruction you would select iii=110 (mov reg, reg), rr=00 (ax), and mmm=001 (bx). This pr...
I am reading the book The Art of Assembly Language. I came across these two lines. the three byte encoding for mov ax, [1000] would be 0C6h, 00h, 10h and the three byte encoding for mov ax, [2000] would be 0C6h, 00h, 20h. Can anybody show me how mov ax, [1000] converted to oc6h, ooh, 10h and mov ax, [2000] converted to 0C6h, 00h, 2...
Hello all; I am writing a number converter between the (b h d) numbering systems , the program accepts 16 bits binary number , or 4 digits hex. or 5 decimal. the reading procedure i wrote seems to have a problem when the decimal value is above 65535 (FFFFh) since im dealing with 16 bit registers and it cant contain larger values i wou...
It's required from me to suggest an assembly project (not too simple and not too complex) tol be written for Intel 8086 microprocessor. One of the suggested projects was a calculator doing normal operations. Can anyone suggest another project? Simple clarification: that the idea of this project shall be implemented on the pc not usin...