how does a computer work out a hexadecimal sum

youdsy · 15 Mar 2012 at 13:58

anyone know ?

thanks

tom_e · 15 Mar 2012 at 13:59

magic, do your own homework

LiE · 15 Mar 2012 at 13:59

Computers work in binary?

mp3duck · 15 Mar 2012 at 14:00

little pixies inside your computer with abacuses

scorza · 15 Mar 2012 at 14:00

Adds stuff up in binary then displays it as hex?

edscdk · 15 Mar 2012 at 14:03

think about how you add two number up

its a bit like that but totally different

LiE · 15 Mar 2012 at 14:06

http://mathforum.org/library/drmath/view/66714.html

Cosimo · 15 Mar 2012 at 14:07

Takes hex, internally converts into binary, does the arithmetic, displays results back in hex.

i5aces · 15 Mar 2012 at 14:09

edscdk said:
think about how you add two number up

its a bit like that but totally different

genius

bitslice · 15 Mar 2012 at 14:13

mov a,08h
mov b,02h
add a,b

youdsy · 15 Mar 2012 at 14:13

simulatorman said:
Takes hex, internally converts into binary, does the arithmetic, displays results back in hex.

thought it was something like that thanks.

got an exam at 5 and not got any notes etc.

one think though i got an example here, its 5EH - 4CH. the H is upper case but is smaller than other figures and its sort of on the toe of E and C if that makes sense. what does that mean?

edscdk · 15 Mar 2012 at 14:16

simulatorman said:
Takes hex, internally converts into binary, does the arithmetic, displays results back in hex.

it cannot accept hex its binary!!!

it accepts a string of 1's and 0's and does some magic, then does some stuff to disply some other stuff on the screen (unless its not going to be displayed on the screen)

Judgeneo · 15 Mar 2012 at 14:17

bitslice said:
mov a,08h
mov b,02h
add a,b

This.

Plus many other lines.

bitslice · 15 Mar 2012 at 14:20

youdsy said:
thought it was something like that thanks.

got an exam at 5 and not got any notes etc.

one think though i got an example here, its 5EH - 4CH. the H is upper case but is smaller than other figures and its sort of on the toe of E and C if that makes sense. what does that mean?

It means 5E is a hexadecimal number, like 21H is not 21 decimal, it's 21 hex (or base 16, not base 10)

Mr^B · 15 Mar 2012 at 14:28

The worrying thing is that he'll probably pass the exam.

Mr. Peri Peri · 15 Mar 2012 at 14:28

edscdk said:
think about how you add two number up

its a bit like that but totally different

This made me lol.

To the OP, it's just smoke and mirrors. Crack open your case and have a look

Cosimo · 15 Mar 2012 at 14:32

youdsy said:
thought it was something like that thanks.

got an exam at 5 and not got any notes etc.

one think though i got an example here, its 5EH - 4CH. the H is upper case but is smaller than other figures and its sort of on the toe of E and C if that makes sense. what does that mean?

H is not part of the hex character set which is 0-9 and A-F

So here we have:

5E - 4C = 12 hex
1011110 – 1001100 = 10010 binary
94 - 76 = 18 decimal

Tikkabhuna · 15 Mar 2012 at 14:35

edscdk said:
it cannot accept hex its binary!!!

it accepts a string of 1's and 0's and does some magic, then does some stuff to disply some other stuff on the screen (unless its not going to be displayed on the screen)

Of course it takes Hex. You don't type a hex number in as binary do you?

Myshra · 15 Mar 2012 at 14:36

Probably worth noting hex notation can also be 0x<number> eg 12d = 0x000c

youdsy · 15 Mar 2012 at 14:51

got some other questions

describe two common types of micro controller architecture

a computer has 26 address lines. calculate teh total memory capacity available in Mb