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蛇头移动完成

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laffey98
2021-04-13 08:59:21 +08:00
parent 252484f1b4
commit 18826c58b6
1 changed files with 79 additions and 1 deletions
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80
move.asm
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@@ -3,6 +3,84 @@
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
move:
.scope
;test
;lda #1 ;演示用
;sta eat
lda eat ;eat判断，进入两种移动模式
;bne +++++ ;进入模式一：四种移动模式（吃到）（头动，尾不动）
lda d
;lda #go_l ;测试用
cmp #go_d
bne +
clc
lda shead ;new head
adc #40
sta shead
lda shead+1
adc #0
sta shead+1
ldy #0 ;head move down
lda #csnk
sta (shead),y
rts
* cmp #go_r
bne +
clc
lda shead ;new head
adc #1
sta shead
lda shead+1
adc #0
sta shead+1
ldy #0 ;head move right
lda #csnk
sta (shead),y
rts
* cmp #go_l
bne +
clc
lda shead ;new head
sec
sbc #1
sta shead
lda shead+1
sbc #0
sta shead+1
ldy #0 ;head move left
lda #csnk
sta (shead),y
rts
* cmp #go_u
bne +
clc
lda shead ;new head
sec
sbc #40
sta shead
lda shead+1
sbc #0
sta shead+1
ldy #0 ;head move up
lda #csnk
sta (shead),y
* rts
;模式二：四种移动模式
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; lda d
; lda #go_d ;实验用
; cmp go_d
; beq +
; lda #csps
; ldy #0
; sta (shead),y
; lda #csnk
; ldy #40
; sta (shead),y
; clc
; lda shead
; adc #40
; sta shead
; lda shead+1
; adc #0
; sta shead+1
;* rts
.scend