Re: [stella] 6 digit code: Question 3

["Andrew Davie" <atari2600@xxxxxxxxxxxxx>]

You haven't initialised the high byte of the last pointer.

 

    lda     #>l_a         ; 2
    sta     digitPtr+1      ; 3
    sta     digitPtr+3      ; 3
    sta     digitPtr+5      ; 3
    sta     digitPtr+7      ; 3
    sta     digitPtr+9      ; 3
 

 

 

That's your high byte init.  It's doing 5 pointers.

You should probably add

 

    sta digitPtr+$b

 

Cheers

A

 

 

----- Original Message -----

From: Chris Larkin

To: stella@xxxxxxxxxxx

Sent: Thursday, September 11, 2003 2:24 PM

Subject: [stella] 6 digit code: Question 3

OK... almost there

 

Final question on this subject... Then I'll quit :-)

 

When I load the pointers manually:

 

lda <letter

sta ptr

lda >letter

sta ptr+1

 

it works perfectly... however when I try to load the pointers from a table

 

table: .byte <letter

 

ldx #0

lda table,x

sta ptr

 

The last graphic does not draw correctly... why could this be?

 

Two sources attatched... works.s and broke.s

 

I'm sure it's something silly, any help is always appreciated

 

Thanks!

 

--Chris