Keep DAA! (was Re: 8086 bugs)
Fred Cisin
cisin at xenosoft.com
Sat Dec 10 12:03:35 CST 2005
> > AND AL,00fh
> > ADD AL,090h
> > DAA
> > ADC AL,040h
> > DAA
> > RET
or:
AND AL, 0Fh
DAA
ADD AL, 0F0h
ADC AL, 40h
or:
AND AL, 0Fh
ADD AL, 0
ADC AL,28h
DAA
and, of course, it can be extended to 16 bits with screen display by:
MOV CX, 0404h ; CH and CL are independent
N1: ROL AX, CL
PUSH AX
AND AL, 0Fh
DAA
ADD AL, 0F0h
ADC AL, 40h
MOV AH, 0Eh ;displays char in AL at cursor position
INT 10h
POP AX
DEC CH
JNZ N1
--
Grumpy Ol' Fred cisin at xenosoft.com
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