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main框架基本完成
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22
head.asm
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22
head.asm
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.alias cblk $66 ; 边框
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.alias csnk $a0 ; 像素
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.alias csps $20 ; 空白
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.alias go_u $55 ; 上
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.alias go_d $5f ; 下
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.alias go_l $1d ; 左
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.alias go_r $32 ; 右
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.alias st_g $a0 ; 开始/暂停
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.alias ed_g $20 ; 结束
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.data zp
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.space d 1 ; 方向 值定义如上
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.space c 1 ; 🐍长度 最大255 最小0
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.space s 2 ; 得分 小端序
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.data
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.org $0400
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.space title 40
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.space field 960 ; 蛇所在屏幕内存区
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.text
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