Andrew Davie wrote:
>
> Before I reinvent the wheel, can anybody comment on the feasibility of
> producing a non-repeated playfield by writing PF0, PF1 and PF2 chasing the
> scanning beam before data required for the repeated section? Of course,
> there would be two lots of writes required per scan line, but I'm interested
> to know if its been done. What I'm asking, I guess, is when it comes to
> drawing the right half of the PF, does the hardware re-read the PF
> registers, or is it buffered internally somehow?
The registers are re-read so it can be done pretty easily, and was done
in a great many games. One of the better examples you'll run across is
the 2nd tier of platforms in This Planet Sucks! Both players and the
playfield registers are drawn in single-scanline, all are color-varied,
and the playfield registers are all re-written. Whew, how'd he do all
that? ;) Check it out!
--
mor@xxxxxxx
http://www.crl.com/~mor/tps
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