fumiama/c64-snake
1
0
Fork 0
mirror of https://github.com/fumiama/c64-snake.git synced 2026-06-28 07:50:33 +08:00
Code Activity

框架构建完成

Browse Source
This commit is contained in:
fumiama
2021-04-03 19:34:32 +08:00
parent c21a2a1efb
commit f716081ad7
17 changed files with 241 additions and 109 deletions
Download Patch File Download Diff File Expand all files Collapse all files

60
printfield.asm
View File

@@ -6,37 +6,35 @@ printfield:
.data zp
.space _ptr 2
.text
ldx #23 ; i代表行数，不含边框
lda #<field ; 取地址低8位
sta _ptr
lda #>field ; 取地址高8位
sta _ptr + 1
ldy #0
* lda #cblk
sta (_ptr), y ; 打印左边框
lda #39
jsr _addptr
lda #cblk
sta (_ptr), y ; 打印右边框
lda #1
jsr _addptr
dex
bne -
lda #cblk
ldy #40
dec _ptr
* sta (_ptr), y ; 打印底边
dey
bne -
ldx #0
jsr plot
rts
ldx #23 ; i代表行数，不含边框
lda #<field ; 取地址低8位
sta _ptr
lda #>field ; 取地址高8位
sta _ptr + 1
ldy #0
* lda #cblk
sta (_ptr), y ; 打印左边框
lda #39
jsr _addptr
lda #cblk
sta (_ptr), y ; 打印右边框
lda #1
jsr _addptr
dex
bne -
lda #cblk
ldy #40
dec _ptr
* sta (_ptr), y ; 打印底边
dey
bne -
rts
_addptr:
clc
adc _ptr
bcc +
inc _ptr + 1
* sta _ptr
rts
clc
adc _ptr
bcc +
inc _ptr + 1
* sta _ptr
rts
.scend