;PHY4635/5635 Sp 08
;Takehome Lab #1  

;Press the emulate button and "single step" slowly.
;Watch the flags and the IP and the registers.

mov ax,5555h    ;IMMEDIATE ADDRESSING example 
mov bx,0AAAAh   ;leading "0" required by this assembler for chars
mov cx,bx       ;REGISTER ADDRESSING example  
and cx,ax       ;needed cx so we don't destroy BX contents
                ;LOOK at CX contents, make sense?
shl ax,1
mov cx,bx
and cx,ax
                ;LOOK at CX contents, make sense?
shr ax,1        ;restore AX to its original contents 
mov cx,bx
or cx,ax        ;LOOk at CX contents, make sense?
        
;Now, here's a loop - watch carefully  
;We're clearing out the AX register (not efficiently, BTW)
                 
label: shl ax,1
jnz label                                                 
    
mov cx,1234h
push cx         ;We just placed the contents of CX onto the "stack"
mov cx,0ffffh   ;You can do lots of stuff with CX
pop cx          ;...and recover it later by "popping" CX back
                ;...off the stack.

;We're done for now - play around all you want - it's safe.  

;Try running some examples, watch how they work.

ret   ; return to the operating system.