Check this little assignment...

[mood302]

Dear Gurus!

I'm just begginner level student of assembly and I found the following question in my assignment. However, I've solved it but I want confirmation about its correctness, and if it isn't correct, please do it. (These results have been achieved by using NASM assembler).

Problem: Fill out the corresponding values in HEX in the register table after the execution of each instruction.

Instructions        AL     Carry Flag
mov al, 5dh         
shr al, 3
mov al, 3ch
sar al, 6
mov ax, 12d4h
rol ax, 7
rcr ax, 2
sar ax, 1

Solution:
Instructions        AL     Carry Flag
mov al, 5dh         5d     0
shr al, 3           0b     1
mov al, 3ch         3c     1
sar al, 6           00     1
mov ax, 12d4h       12d4   1
rol ax, 7           00     0
rcr ax, 2           00     0
sar ax, 1           00     0

Highly thanx.


Mood.

[Hobson]

Unfortunately, starting with line 'rol ax, 7' your results appear to be incorrect. I will not write you correct results here, jus will let you rethink this problem again . You can complete this task with writing program and debugging it with some debugger (TD, Visual Studio inline assembly, or maybe there is some debugger coming with NASM?).

Regards,
Hob

[mood302]

Dear Hobson!

I've checked again this assignment and the solution with some changes is here. Now please check it critically. Actually, I want to get full marks in this assignment.

Instructions        AL     Carry Flag
mov al, 5dh         
shr al, 3
mov al, 3ch
sar al, 6
mov ax, 12d4h
rol ax, 7
rcr ax, 2
sar ax, 1

Solution:
Instructions        AL     Carry Flag
mov al, 5dh         5d     0
shr al, 3           0b     1
mov al, 3ch         3c     1
sar al, 6           00     1
mov ax, 12d4h       d4     1
rol ax, 7           09     1
rcr ax, 2           82     0
sar ax, 1           41     0

Thanx a lot.


Mood

[Hobson]

Now your solution seems to be OK. I wish you full marks for this assignment, but I think that it would be really good if you learn how to check this by yourself using debugger.

Regards,
Hob

[mood302]

Dear Hobson!

Being student of very beginner level, I'm trying to understanding the debugger's usage, but I'm not confirmed about the results, so I drop a request for check.

However, thanx a lot for guiding.


Mood.