Thomas Jentzsch schrieb:
> > I try to eliminate the blank HMOVE lines via doing HMOVE on cycle 74.
> > There the HMXX values are shifted 8 pixel into the negative. To
> > compensate that, I just tried adding 8 at the beginning of my
> > positioning routine.
> > Now, when coming close to the end of the screen with any value >164 the
> > routine no longer functions properly.
> Try positioning at X modulo 160, I think that should solve the problem.
> Correct me, if I'm wrong :)
It worked!
*bounce*
Thanks!
BTW: In QB, there's this sethorpos routine, written by Andrew and
improved with suggestions from you. I've just found yet another
improvement!
Looky here!
This is the end of the routine in QB:
----------------------------------------
sta HMP0,x
sta WSYNC
jsr Ret ; Waste 12 cycles, 3 Byte
bit 0 ; Waste 3 cycles, 2 Byte
; + sum: 15 cycles, 5 Byte
Jiggle dey
bpl Jiggle
sta RESP0,x
----------------------------------------
Here's my idea:
----------------------------------------
STA HMP0,x
INY ; Waste 5 cycles, 1 Byte
STA WSYNC
INY ; Waste 7(!) cycles, 1 Byte
BIT 0 ; Waste 3 cycles, 2 Byte
; + sum: 15 cycles, _4_ Byte!!!
PosDelay dey
bpl PosDelay
STA RESP0,x
----------------------------------------
Apart from saving a byte, it prevents you from possibly losing another
two byte to the stack...
(Avoiding that was my original intention, in Gunfight there's _never_ a
subroutine call within a subroutine call within a subroutine :-))
Greetings,
Manuel
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