Problems with a little ASM code

[VoltureX]

I can't get this code to work though it's in a manual for ASM for the Amiga. What could be wrong?

move.w #$4000,$DFF09A
move.w #$03A0,$DFF096
loop:

move.w $DFF006,SDFF180

btst #6,$BFE001
bne.s loop
move.w #$83A0,$DFF096
move.w #$C000,$DFF09A

rts

Thanks

Volt.

[Leffmann]

The manual you're reading isn't teaching very good practices, but to make that code run correct change it into this:

 move.w  #$4000, $dff09a
 move.w  #$200, $dff096
loop
 move.w  $dff006, $dff180
 btst    #6, $bfe001
 bne     loop
 move.w  #$8200, $dff096
 move.w  #$c000, $dff09a
 moveq   #0, d0
 rts

[VoltureX]

I still get an error on the first line in ASM-Pro.

Volt.

[StingRay]

Precede each line with a TAB.

[Thorham]

Originally Posted by StingRay

Precede each line with a TAB.

Except the label lines

[VoltureX]

Why do I get an "Illegal Operator" in this line?

move.w #$4000, $dff09a

Volt.

I got it to work. The TABS were missing.

Thanks for guiding me

[Thorham]

Originally Posted by VoltureX

Why do I get an "Illegal Operator" in this line?

move.w #$4000, $dff09a

Volt.

Because there's no space or tab in front of the move. Things like labels and constants start at column one, and the actual assembler instructions should go into columns two or higher.

[StingRay]

Originally Posted by Thorham

Except the label lines

Indeed.

Originally Posted by VoltureX

Why do I get an "Illegal Operator" in this line?

move.w #$4000, $dff09a

Thorham already explained it but here's some more additional info. The assembler needs to distinguish between labels and actual instructions thus instructions must not start at the first column. You can change that behaviour in the AsmPro settings though, if you tick the "Label :" checkbox, you have to end each label with a colon but can then also start instructions at the first column since the assembler will use the colon to recognise the labels.