Questions tagged [addressing]
153 questions
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8086 assembly: MOV part of a string into a variable
Assuming I have a string of ascii characters such as "652+346*779=", and I want to move some characters FROM this variable TO another variable...
Buffer is the string (in this case "652+346*779=")
lengthofnum is the length of the number in question…
user979388
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1 answer
Assembly Language Indirect Addressing
I am working through some indirect addressing problems and I am not sure how to properly count bytes. We are given this code:
.data
v1 db 9,7,5,3,1
v2 dw 0
v3 dw -1
v4 db '$'
mov dx,offset v2
mov ah,9
int 21h
The question asks how many…
raphnguyen
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Address and data lines - how to calculate storage capacity
I have been asked the following question
A memory device has 16 address lines and 64 data lines. Calculate the storage capacity of the memory in bytes and kilobytes
I know that if there are 16 address lines, there are 2^16 = 65,536 addressable…
EML
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Memory allocation when casting to a VLA type
I am puzzled by the memory allocation and accesses to a matrix of pointers in an application I am working in.
There is a matrix defined as:
typedef double (*foo)[n/m][m][m];
Which I understand to be a three-dimensional matrix storing pointers to…
Juan González
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2 answers
PyCUDA Memory Addressing: Memory offset?
I've got a large chunk of generated data (A[i,j,k]) on the device, but I only need one 'slice' of A[i,:,:], and in regular CUDA this could be easily accomplished with some pointer arithmetic.
Can the same thing be done within pycuda? i.e…
Bolster
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Do modern computer systems (x86 architecture) have virtual adressing independent of the OS?
Sorry if this question sounds a little confused or jumbled, but I feel quite a bit of confunsion over this concept.
What Im wondering is, if I were to write a kernel for "bare" computer hardware in C/ Assembly, would I be able to use virtual…
exliontamer
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2 answers
Concerning real mode physical memory addressing
Me and my friend were brainstorming about a question concerning physical memory addressing in real mode and we couldn't wrap our heads around it. Here goes.
In real mode 16 is multiplied to the segment selector register and added to the offset…
Micky
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Can you subtract two pointers in assembly language?
I ran into to the following bit of code and am trying to conceptually understand it:
mov si,offset v5
mov di,offset v2
sub si,di
v5 and v2 refer to the following data:
v2 dw 4
v5 dw 3
So from my understanding, this seems to touch on the concept…
user10335564
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Compiling MIPS to use branch instead of jump
Having the following very simple c program:
#include
#include
int main()
{
char *buffer = (char*)malloc(20);
}
And Compiling it with mips-linux-gnu-gcc, it looks like the call is compiled to the following…
macro_controller
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how Byte Address memory in Altera FPGA?
I worked with megafunctions to generate 32bit data memory in the fpga.but the output was addressed 32bit (4 bytes) at time , how to do 1 byte addressing ?
i have Altera Cyclone IV ep4ce6e22c8.
0xDEADC0DE
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2 answers
Addressing in CSS in Flex: Buttons in RichTextEditor only?
I want to change the font characteristics for buttons in the toolbar of the RichTextEditor, but I want them to be different than other buttons in my application. Is there any way to do this with just CSS? I know that I can do it with setStyle if…
Dan Rosenstark
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Move address to register by using the indexed addressing mode
Is it possible to calculate an address by using the indexed addressing mode syntax and store it into a register? Something like the following (wrong) expression (in AT&T assembly syntax):
movl $dataarray(,%edi,8), %eax
I know that the indexed…
cppstudy
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Gurux DLMS communication addressing
I've an existing Actaris Electricity meter system and I've got only few information about it. I have to write a new program to replace the current one that is reading data from the meter. I'm trying to listen into the current communication throught…
Csaba Horváth
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How many number of bits stored in a memory location in PDP 11
PDP 11 is said to be word addressable which means every data access returns 16 bit data. Suppose I give a read request for address 100 in memory. Will it return 8 bits(LSB) from address 100 and 8bits(MSB) from address 101. And also as PDP 11 has 16…
sandywho
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Get the rows of a matrix using another matrix
I'm trying to find a vectorized way to do the following -
X =
0 1
5 5
-1 8
> w=[false true; true false; false true]
w =
0 1
1 0
0 1
I want to index into X's rows using the columns of w, so the first column of…
monkey king
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