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putcharhex: ; bl=argument
pusha
mov ah, 0x0e
mov al, bl
and al, 0xf0
shr al, 4
call fourbit2hex
int 0x10
mov al, bl
and al, 0x0f
call fourbit2hex
int 0x10
popa
ret
fourbit2hex: ; al=argument=result
cmp al, 10
jae fourbit2hex_alpha
add al, '0'
ret
fourbit2hex_alpha:
add al, 'A'
sub al, 10
ret
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