Erik Mooney wrote:
> Unless your routine displays the characters in a different place than the
> standard routine (center of the screen), why?
Simply to see if I could do it, and gain the experience...
> The standard routine (don't think there IS any other, since the standard
> does it with no cycles to spare) uses the 12 bytes for the pointers plus
> one for temp storage. You can store the score data any way you like and
> set up the pointers during vblank. I'd probably recommend 3 bytes of BCD.
Hmm, I'm still doing a wsync on each line... perhaps I should transfer
the source/binary over (a bit of a hassle, since it's on the 64) and
let you folks have a look.
> It uses indirect indexed addressing, so it has to use LDA for the loads...
> for temp storage, STA zeropage / LDA zeropage is the same speed as
> TAX/TXS/TSX, with the added flexibility of letting the load be into any of
> the registers.
No - tax/txs/tsx etc only take 2 cycles, while LD?/ST? zero page take 3.
This is why I used the stack pointer as the extra - saved one cycle...
> The standard routine uses it, and it doesn't actually delay by a line.
> Search the archives for my message titled "The scores / 48-pixel highres
> routine explained!". (wow, close to a year since I did that...)
Okay, I'll have to check that out.
> Well, there's the old movable-sprite deal, if you haven't done that yet.
You mean just a sprite moving around under joystick control? Yes, that
was my first program.
> Can't think of any other widely-used routines off the top of my head.. best
> I can come up with is a paddle-reading routine. Another popular routine
> around here, though I haven't tried it, is a flicker-reducing
> multiple-sprite package. Or you could try to make your score routine into
> a movable 48-pixel sprite... if you can do that, we'll be groveling at your
> feet :)
:) 48-pixel sprite, that can be positioned anywhere? :) I'll have to
try ;)
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Robin Harbron macbeth@xxxxxxxxxxx
http://www.tbaytel.net/macbeth
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