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34 lines
809 B
PHP
34 lines
809 B
PHP
OpDEY = $88 ; DEY opcode
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OpINY = $c8 ; INY opcode
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OpDEX = $ca ; DEX opcode
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OpINX = $e8 ; INX opcode
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OpNOP = $ea ; NOP opcode
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; zero page addresses
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MON_WNDLEFT = $20 ; left column of scroll window
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MON_WNDWDTH = $21 ; width of scroll window
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MON_WNDTOP = $22 ; top of scroll window
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MON_WNDBTM = $23 ; bottom of scroll window
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MON_CH = $24 ; cursor horizontal displacement
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MON_CV = $25 ; cursor vertical displacement
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MON_CSWL = $36 ; character output hook (lo)
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MON_CSWH = $37 ; character output hook (hi)
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BAS_ARYTAB = $6b ; pointer to start of Applesoft array space (2b)
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; Clear variables
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HPTR = $06
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HPAGE = $18 ; hi-res page ($20 or $40)
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XSTART = $1c
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YSTART = $1d
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XEND = $1e
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YEND = $1f
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DELTA_X = $3c
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DELTA_Y = $3d
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LINE_ADJ = $3e
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LINE_INDEX = $43
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YSAVE = $00
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FIRST_LINE = $45
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LAST_LINE = $46
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