2019-01-20 06:05:52 +00:00
|
|
|
;==========================
|
|
|
|
|
; check for earthquake
|
|
|
|
|
|
|
|
|
|
earthquake_handler:
|
|
|
|
|
lda FRAMEH
|
|
|
|
|
and #3
|
|
|
|
|
bne earth_mover
|
|
|
|
|
lda FRAMEL
|
|
|
|
|
cmp #$ff
|
|
|
|
|
bne earth_mover
|
|
|
|
|
earthquake_init:
|
|
|
|
|
lda #200
|
|
|
|
|
sta EQUAKE_PROGRESS
|
|
|
|
|
|
|
|
|
|
lda #0
|
|
|
|
|
sta BOULDER_Y
|
|
|
|
|
jsr random16
|
|
|
|
|
lda SEEDL
|
|
|
|
|
and #$1f
|
|
|
|
|
clc
|
|
|
|
|
adc #4
|
|
|
|
|
sta BOULDER_X
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
earth_mover:
|
|
|
|
|
lda EQUAKE_PROGRESS
|
|
|
|
|
beq earth_still
|
|
|
|
|
|
|
|
|
|
and #$8
|
|
|
|
|
bne earth_calm
|
|
|
|
|
|
|
|
|
|
lda #2
|
|
|
|
|
bne earth_decrement
|
|
|
|
|
|
|
|
|
|
earth_calm:
|
|
|
|
|
lda #0
|
|
|
|
|
earth_decrement:
|
|
|
|
|
sta EARTH_OFFSET
|
|
|
|
|
dec EQUAKE_PROGRESS
|
|
|
|
|
jmp earth_done
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
earth_still:
|
|
|
|
|
lda #0
|
|
|
|
|
sta EARTH_OFFSET
|
|
|
|
|
|
|
|
|
|
earth_done:
|
|
|
|
|
|
|
|
|
|
;================================
|
|
|
|
|
; copy background to current page
|
|
|
|
|
|
|
|
|
|
lda EARTH_OFFSET
|
|
|
|
|
bne shake_shake
|
|
|
|
|
no_shake:
|
|
|
|
|
jsr gr_copy_to_current
|
|
|
|
|
jmp done_shake
|
|
|
|
|
shake_shake:
|
2019-03-19 01:29:32 +00:00
|
|
|
jsr gr_copy_to_current_BC00
|
2019-01-20 06:05:52 +00:00
|
|
|
done_shake:
|
|
|
|
|
|
|
|
|
|
rts
|
|
|
|
|
|
2019-01-20 06:54:58 +00:00
|
|
|
|
|
|
|
|
;======================
|
|
|
|
|
; draw falling boulders
|
|
|
|
|
draw_boulder:
|
|
|
|
|
lda BOULDER_Y
|
|
|
|
|
cmp #38
|
|
|
|
|
bpl no_boulder
|
|
|
|
|
|
|
|
|
|
lda #<boulder
|
|
|
|
|
sta INL
|
|
|
|
|
lda #>boulder
|
|
|
|
|
sta INH
|
|
|
|
|
|
|
|
|
|
lda BOULDER_X
|
|
|
|
|
sta XPOS
|
|
|
|
|
lda BOULDER_Y
|
|
|
|
|
sta YPOS
|
|
|
|
|
jsr put_sprite
|
|
|
|
|
|
|
|
|
|
lda FRAMEL
|
|
|
|
|
and #$3
|
|
|
|
|
bne no_boulder
|
|
|
|
|
inc BOULDER_Y
|
|
|
|
|
inc BOULDER_Y
|
|
|
|
|
|
|
|
|
|
no_boulder:
|
|
|
|
|
|
|
|
|
|
rts
|
|
|
|
|
|
2019-03-19 01:29:32 +00:00
|
|
|
|
|
|
|
|
;=========================================================
|
|
|
|
|
; gr_copy_to_current, 40x48 version
|
|
|
|
|
;=========================================================
|
|
|
|
|
; copy $BC00 to DRAW_PAGE
|
|
|
|
|
|
|
|
|
|
gr_copy_to_current_BC00:
|
|
|
|
|
|
|
|
|
|
lda DRAW_PAGE ; 3
|
|
|
|
|
clc ; 2
|
|
|
|
|
adc #$4 ; 2
|
|
|
|
|
sta gr_copy_line_BC+5 ; 4
|
|
|
|
|
sta gr_copy_line_BC+11 ; 4
|
|
|
|
|
adc #$1 ; 2
|
|
|
|
|
sta gr_copy_line_BC+17 ; 4
|
|
|
|
|
sta gr_copy_line_BC+23 ; 4
|
|
|
|
|
adc #$1 ; 2
|
|
|
|
|
sta gr_copy_line_BC+29 ; 4
|
|
|
|
|
sta gr_copy_line_BC+35 ; 4
|
|
|
|
|
adc #$1 ; 2
|
|
|
|
|
sta gr_copy_line_BC+41 ; 4
|
|
|
|
|
sta gr_copy_line_BC+47 ; 4
|
|
|
|
|
;===========
|
|
|
|
|
; 45
|
|
|
|
|
|
|
|
|
|
ldy #119 ; for early ones, copy 120 bytes ; 2
|
|
|
|
|
|
|
|
|
|
gr_copy_line_BC:
|
|
|
|
|
lda $BC00,Y ; load a byte (self modified) ; 4
|
|
|
|
|
sta $400,Y ; store a byte (self modified) ; 5
|
|
|
|
|
|
|
|
|
|
lda $BC80,Y ; load a byte (self modified) ; 4
|
|
|
|
|
sta $480,Y ; store a byte (self modified) ; 5
|
|
|
|
|
|
|
|
|
|
lda $BD00,Y ; load a byte (self modified) ; 4
|
|
|
|
|
sta $500,Y ; store a byte (self modified) ; 5
|
|
|
|
|
|
|
|
|
|
lda $BD80,Y ; load a byte (self modified) ; 4
|
|
|
|
|
sta $580,Y ; store a byte (self modified) ; 5
|
|
|
|
|
|
|
|
|
|
lda $BE00,Y ; load a byte (self modified) ; 4
|
|
|
|
|
sta $600,Y ; store a byte (self modified) ; 5
|
|
|
|
|
|
|
|
|
|
lda $BE80,Y ; load a byte (self modified) ; 4
|
|
|
|
|
sta $680,Y ; store a byte (self modified) ; 5
|
|
|
|
|
|
|
|
|
|
lda $BF00,Y ; load a byte (self modified) ; 4
|
|
|
|
|
sta $700,Y ; store a byte (self modified) ; 5
|
|
|
|
|
|
|
|
|
|
lda $BF80,Y ; load a byte (self modified) ; 4
|
|
|
|
|
sta $780,Y ; store a byte (self modified) ; 5
|
|
|
|
|
|
|
|
|
|
dey ; decrement pointer ; 2
|
|
|
|
|
bpl gr_copy_line_BC ; ; 2nt/3
|
|
|
|
|
|
|
|
|
|
rts ; 6
|
|
|
|
|
|
