34 lines
800 B
NASM
34 lines
800 B
NASM
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; x86 video stuff
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; each character cell is a 16 bit word
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; upper attribute byte is (upper 4 bits) - bg color, (lower 4 bits) fg color
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; lower byte is ascii char
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%define X86_COLS 80
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%define X86_ROWS 25
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%define X86_VRAM 0xb8000
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; these values are already shifted to accomodate xor-ing
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; with the lower ascii char byte
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%define FG.BLACK 0 << 8
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%define FG.BLUE 1 << 8
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%define FG.GREEN 2 << 8
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%define FG.CYAN 3 << 8
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%define FG.RED 4 << 8
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%define FG.MAGENTA 5 << 8
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%define FG.YELLOW 6 << 8
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%define FG.GRAY 7 << 8
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%define FG.BRIGHT 8 << 8
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%define BG.BLACK 0 << 12
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%define BG.BLUE 1 << 12
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%define BG.GREEN 2 << 12
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%define BG.CYAN 3 << 12
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%define BG.RED 4 << 12
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%define BG.MAGENTA 5 << 12
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%define BG.YELLOW 6 << 12
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%define BG.GRAY 7 << 12
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%define BG.BRIGHT 8 << 12
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