Bob's Blog

Hi there!

 

Well, if you just want to recycle things from that project, I'd say you have almost an engine for Son Son there

 

Greetings,

Manuel

Wait a minute... How did you do the 7-digit score?

Wait a minute... How did you do the 7-digit score?

 

At the time, I thought it was really cool, but I'm less in love with it now. Basically, it's cheating: I'm using a missile and, IIRC, the ball (to mask out the middle) to create a static zero.

Wait a minute... How did you do the 7-digit score?

 

At the time, I thought it was really cool, but I'm less in love with it now. Basically, it's cheating: I'm using a missile and, IIRC, the ball (to mask out the middle) to create a static zero.

Nah... That's kind of cool. A lot of games have static zeros. So how did you find the time to turn the ball on then off again? Did you unroll the loop?

Wait a minute... How did you do the 7-digit score?

 

At the time, I thought it was really cool, but I'm less in love with it now. Basically, it's cheating: I'm using a missile and, IIRC, the ball (to mask out the middle) to create a static zero.

Nah... That's kind of cool. A lot of games have static zeros. So how did you find the time to turn the ball on then off again? Did you unroll the loop?

Ummm...I dunno?

It's been a while since I worked on this. Lemme dig it up.

 

EDIT:

   sta WSYNC           ;               begin line 7
  sta HMOVE           ;+3      3

 ;--now players, missiles, and ball are positioned as follows:
 ;   P0:  2
 ;   P1: 10
 ;   M0: 51
 ;   M1: 53
 ;   BL: 53

  ldy #4
  sty Temp+13         ;+5      8      for loop counter	

 ;--mask duplicate missiles with PF

  lda #%11110000
  sta PF2             ;+5     13      PF used to mask duplicate missiles.

  ldx #3              ;+2     15
WaitScreen10biii
  dex
  bne WaitScreen10biii;+14    29

  nop
  nop

  nop
  nop                 ;+8     37

 ;--turn on both missiles at end of this scanline

  lda #2  
  sta ENAM0
  sta ENAM1           ;+8     45

DisplayScoreLoop
  lda (Temp+10),Y
  sta GRP0            ;+8     53      P0 not displayed
  lda (Temp+8),Y
  sta GRP1            ;+8     61      P0 & P1 displayed here
  lda (Temp+6),Y
  sta GRP0            ;+8     69      P0 not displayed
  lda FixedZeroData,Y
  sta ENABL           ;+7     76      end lines 7, 8, 9, 10, 11
  lda (Temp+4),Y
  tax                 ;+7      7

  lda (Temp+2),Y
  sta Temp+12         ;+8     15      save this image data
  lda (Temp),Y
  tay                 ;+7     22
  lda Temp+12         ;+3     25      restore image data

  stx GRP1            ;               so pixel 109 is when second P0 is displayed.
  sta GRP0
  sty GRP1            ;+9     34      everything displayed now!

  ldy Temp+13         ;+3     37      restore loop counter
  dey                 ;+2     39
  sty Temp+13         ;+3     42      save for next time
  bpl DisplayScoreLoop;+2/3   44/45