rdos/src/@rdos.asm

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org 600h
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jmp end
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add [bx+si], al
add al, al
add ax, ax
rep movsb
cs xor word [bp], 0x7C00
xor word [bp+04h], 0x7C00
lock es xor word [04h], 0x7C00
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dw foo
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end hlt
jmp end
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foo equ end+040h