After seeing a program where there are more returns than calls...

> Now to answer the question "Why don't this work?:"
> 
> It is like Mr. Ringer.  Most Sundays when we would go to 
> church we would stop at the crossroads and pick up Mr. Ringer 
> and give him a ride to church.
> When the collection plate was passed during the service I 
> noticed that sometimes he would put a dollar in the 
> collection plate then take out four dollars, as if he was 
> making change for a five dollar bill.  Later in life I 
> realized that Mr. Ringer had given much to the community and 
> the church in earlier years and everyone knew he was "making 
> change" but as he was sometimes very short on money and too 
> proud to ask for charity, every one was happy that a small 
> part of the collection was going directly to where it was needed.
> 
> Just as Mr. Ringer put money in the collection plate when he 
> had it, you return from the sinetable routine with the RETLW 
> pulling a return address off the stack.  And then at the end 
> of the program you try that again with the RETLW  0  
> instruction.  But there was nothing on the stack.  And your 
> program, unlike Mr. Ringer, goes to Hell!

One of the better explanations of stack overflow... Errr... Underflow.

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