Help! SC/MP Programming Question

[Lawrence Wilkinson]

Well, since I don't see any more qualified replies:

On Tue, 2005-03-29 at 00:52, river wrote:
> Hi,
> 
> I have a small issue with printing out the ASCII char set, from $20 to $7E inclusive.
> 
(snip)
>           xri   $7f             ;gone too far?
>           jz    ktest           ;yes, start at SPACE again
>           jmp   kt1             ;no, print it
Shouldn't this be jmp kt2?  But even so I don't think this would give
you all-spaces as output, maybe $20 $5f $1f ... or something.

> Also, I have some SC/MP listings about and one of them has "LD @0(P2)" instruction.
> >From what I know, and this maybe totally wrong, the "@" is an auto-increment/auto-
> decrement bit and you must specify the displacement for the inc/dec. If this is the case,
> then what does the "0" that immediately follows the "@" do? I would expect to see a
> value other than "0" to ensure the P2 register is inc/dec by the appropriate amount.
I am sure that @0(Px) is wrong, it should be @1(Px).  Looking in my (not
very) trusty Osborne book, it has @0(Px), I wouldn't trust it.  I have
some nice old EA article here, they use @1(Px).  Maybe there is some
reason to use @0(Px) in place of 0(Px)?

> Please, old SC/MP dudes, any help would be greatly appreciated.
Not sure if this counts as help... gets walking stick and shuffles
off...
-- 
Lawrence Wilkinson                                 lawrence at ljw.me.uk
The IBM 360/30 page                       http://www.ljw.me.uk/ibm360