Great Exploitations

from http://www.cppreference.com/operator_precedence.html

 

1. ()

2. * /

3. + -

4. &

5. ^

6. |

use with caution, as vblank already is fairly busy with all of those sprite repositions.

I think I came up with a subroutine that will position all 5 objects in fewer scanlines:

PositionAllObjectsSubroutine
  sta WSYNC
  ldx #4
  SLEEP 3
HorPosLoop       ;     5
  lda HorPos,X  ;+4   9
  sec           ;+2  11
DivideLoop
  sbc #15
  bcs DivideLoop;+4  15
  sta Temp,X    ;+4  19
  sta RESP0,X   ;+4  23
  sta WSYNC
  dex
  bpl HorPosLoop;+5   5
                ;     4

  ldx #4
  ldy Temp,X
  lda Table,Y
  sta HMP0,X    ;+14 18

  dex
  ldy Temp,X
  lda Table,Y
  sta HMP0,X    ;+14 32	

  dex
  ldy Temp,X
  lda Table,Y
  sta HMP0,X    ;+14 46

  dex
  ldy Temp,X
  lda Table,Y
  sta HMP0,X    ;+14 60

  dex
  ldy Temp,X
  lda Table,Y
  sta HMP0,X    ;+14 74

  nop           ;+2  76

  sta HMOVE     ;+3   3

  rts           ;+6   9

It requires that all the X values be consecutive in RAM and it requires a HMxx lookup table, but it only takes a hair more than six scanlines to position all five objects, rather than 10+.

 

Also, if the X value is zero it positions the players at the left-most pixel, which I think is different from your current routine.

 

This particular routine, though based on the positioning code I use in virtually all my projects, is untested, so it may not work.