Understanding Binary

John Board

G'day,

I've decided to not only make programs for the prop with the knowledge that I have, but to actually read up about programming them in general, perticually ASM. It got to the binary section in this (P16 - http://gadgetgangster.com/working_files/assembly_tutorial/potatohead.pdf) ASM tutorial and I thought that I ought to learn more about converting binary to decimal visa versa, so I took a look at this video (http://www.youtube.com/watch?v=tfKe8PPI2zs) which I found quite helpful. But then came the confliction. On P16 of the ASM tutorial on the first addition sum (binary) it said the answer should be 122, however, by my reconing, it should be 13:

------------------------------------------------------------------------------------------------------

   11             11 <---- Carry
     23            110
  + 99         + 111
      --             ---
    122          1101 <----- Sum

--------------------------------------------
128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 |
--------------------------------------------
                           1   1  0   1

   8
   4
+ 1
-----
  13

------------------------------------------------------------------------------------------------------

Can anyone explain this?

Thanks,

John

John Board

Sorry - The indentation of a lot of those sums are out.

potatohead

That is a typo I thought was fixed.

I will review that version. The decimal number example seems wrong. The important thing is the binary. Thanks for posting this.

John Board

Thanks for clarifying this - I thought I had done something wrong!

potatohead

No worries. Keep having fun!

If you run windows operating system, be sure and check out the scientific and or programmer calculator options. It can take and convert decimal, binary and hex.

ajward

John Board wrote: »

G'day,

I've decided to not only make programs for the prop with the knowledge that I have, but to actually read up about programming them in general, perticually ASM. It got to the binary section in this (P16 - http://gadgetgangster.com/working_files/assembly_tutorial/potatohead.pdf) ASM tutorial and I thought that I ought to learn more about converting binary to decimal visa versa, so I took a look at this video (http://www.youtube.com/watch?v=tfKe8PPI2zs) which I found quite helpful. But then came the confliction. On P16 of the ASM tutorial on the first addition sum (binary) it said the answer should be 122, however, by my reconing, it should be 13:

------------------------------------------------------------------------------------------------------

   11             11 <---- Carry
     23            110
  + 99         + 111
      --             ---
    122          1101 <----- Sum

--------------------------------------------
128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 |
--------------------------------------------
                           1   1  0   1

   8
   4
+ 1
-----
  13

------------------------------------------------------------------------------------------------------

Can anyone explain this?

Thanks,

John

Took me a second on that as well... till I realized the decimal and binary problems aren't the same. I suppose the 0030 fog might have had a hand in the confusion! ;-)

The decimal problem, in binary, would look like:

Amanda