[invalid][puzzle] Unsolved mystery

kuroneko

Just found [thread=91799]this old thread[/thread] which doesn't appear to have a solution. So what is the solution and why is the OP seeing the behaviour described in [post=630707]post #8[/post]?

Phil Pilgrim (PhiPi)

It's the old bugaboo: jmp target without the # in line 25:

Main_Loop     test      CONV, ina     wz         'DVALID
       if_nz  jmp       Main_Loop               ' if Test zero, keep looping

Adding the # fixes the problem.

-Phil

idbruce

It is amazing the havoc that one missing character can create in programming. Large PERL scripts and missing semi-colons had a habit of driving me insane.

Bruce

jazzed

idbruce wrote: »

It is amazing the havoc that one missing character can create in programming. Large PERL scripts and missing semi-colons had a habit of driving me insane.

Bruce

Beginner books with bad syntax in the programming examples made me crazy
Dang you Osborne and McGraw-Hill !

I got over this # problem mostly by writing my own PASM simulator some years ago.
Writing a simulator forces one to learn the instructions otherwise it will never work.

Once you get used to semicolons, you can't go back

idbruce

@jazzed

I got over this # problem mostly by writing my own PASM simulator some years ago.
Writing a simulator forces one to learn the instructions otherwise it will never work.

I can feel your pain my friend

Once you get used to semicolons, you can't go back

I miss PERL programming

And you don't want to forget the # in the next line otherwise it will never work

#!/usr/bin/env perl

Bruce

jazzed

idbruce wrote: »

And you don't want to forget the # in the next line otherwise it will never work

#!/usr/bin/env perl

Bruce

HAHAHA

I always thought unix scripts should understand this:

#!/bin/justReadMyMind

idbruce

@jazzed

ESP - Extra Sensory Programming. I like the concept

kuroneko

@Phil: OK, that takes care of the what part (the easy one). Anyone care to explain the why?

Phil Pilgrim (PhiPi)

I fixed the problem. What else matters?

When you jump by mistake to the address held by the contents of your presumed destination (in this case @ina = $1F2) and then expect the instruction at that location to make sense -- or even remain constant -- you're just asking for trouble. 'Enough of an explanation?

-Phil