fys wrote:

> > Main: JMP CLSProc ; hop to the CLS procedure

> > ; Point A

> >

> > .exit

> >

> > CLSProc: MOV ax, 0003h ; A CLS I think

> > INT 10h ;

> > RET ; What to put here to return to point A? JRET?

> > ; Point B

> 

> Main:  CALL CLSProc

> 

> not JMP



Thanx.

 

> In the above, due to DOS's way of clearing the word

> at the current stack location, the RET at the end of CLSProc

> would actually RETurn to DOS.  :-)



Actualy that fact is more usefull than it seems.



> > - JCC = Jump on condition (what is the syntax?)

> > - JZ = Jump on zero  (same as je)

> > - JNZ = Jump on not zero (smae as jne)



Hmm, zero = false, nonzero = true usualy.



So if I wanted to skip out of a loop when say, BX was 4, what codeblock

would I use?



	XOR  BX,4

	JZ   BX,AnOffset



?



BTW, are there/what is the naming method for user-defined variables? Say

I want to store a register value for later use, while I use the register

for some other operation, how do I do that?



> > - JC = Jump on carry (same as jb)

> > - JNC = Jump on not carry (same as jnb)



"Carry"?



> > - LOOP = loop back to a point (to what point? what is the syntax?)

> 

> Same as a conditional jump except it uses (e)cx for the condition.

> 

>    loop label

> is the same as

>    dec  cx

>    jnz   short label



What is DEC?



> > - MOV ax,?? = move a unit of data from DB to ax (how?)

> 

> DB is "declare Byte".  MOV al,?? would be better for DB.

> DW is "declare Word"



Aha. Thanx.



> > Ok. If I use:

> >

> > XOR ax,bx

> >

> > Are ax and bx the input bits and where is the output?

> 

> AX is XOR'ed with BX and the result goes to AX



Thanx.



> I think the file name was something like "opcodes.lst" or similar.



Got it.



			Observer aka DustWolf aka CyberLegend aka Jure Sah



C'ya!



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