25 lines
897 B
PHP
25 lines
897 B
PHP
;; public args
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X_pos = ARGVEC + 0
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Y_pos = ARGVEC + 1
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code = ARGVEC + 2
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;; 16-bit value, we reuse bytes from X_pos
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X_pos_offset_hi = $ED
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X_pos_offset_lo = X_pos
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;; 16-bit value, we reuse bytes from Y_pos
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Y_pos_offset_hi = $EC
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Y_pos_offset_lo = Y_pos
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;; private variables
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screen_position = $EE ; 16-bit value (uses EF)
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temp_value = $EC ; 16-bit value (uses ED)
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;; What you will see bellow is .. interesting. I want to reuse
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;; code and I need it for a 16-bit pointer. Because 6502 pointers expect the bytes to be besides each other
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;; I need to use code +1 to store data even though its fot ARGVEK.
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;; Thats why it's cursed
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petski_position = code ; 16-bit value uses (code +1)
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;; values
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VIC_bank = $4000
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Character_generator_ROM = $D000
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