Rodrigo wrote
> althought I think #$40 or #$42 is more appropriate)
Yup, red is $4x.
> STA ENAM0 ; Btw, is it ok to enable an object even before the
> ; 1st Vsync?
Should be no problem. And the object is invisible as long as VBLANK
is active.
> LDA #2
> STA VBLANK
> STA VSYNC
> STA WSYNC
> STA WSYNC
> STA WSYNC
> LDA #0
> STA VSYNC
That code might not work on a real VCS, because it might doing lesss than
3 VSYNCed lines, if the first WSYNC is happening a bit late in that line.
> LDX #37 ; Set the loop counter: 37 vertical blank lines
>VBlankLoop
> DEX ; DEX is the 1st statement of the loop, so loop counter
> STA WSYNC ; ranges from 36 to 0, which i think is a good
> BNE VBlankLoop ; convention. Btw, is it?
Sure. Or you can loop down to -1, which is sometimes easier to
code (e.g. for table access).
> Btw, Im aware that a HMOVE must
>; be *immediatly* after a WSYNC, but... being just a single BNE
> apart could be considered "immediatly after" ?
IIRC no, that already will change the positioning. There are some
tricks you can do with HMOVE (search the archives for "weird;HMOVE"),
but as a beginner you should always position it *directly* after
a WSYNC.
Have fun!
Thomas
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