Keep DAA! (was Re: 8086 bugs)

[J.C. Wren]

    My CP/M machine is in storage at the moment, but I have the vague 
recollection that the single DAA version doesn't work on the 8080, or 
possibly the Z80.  I know I first used this code on one of those two, 
and I spent some time playing around with it.  Does this sound familiar 
to you?

    --jc

Fred Cisin wrote:

>>>   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
>  
>