Re: Calculate and set Parity

[tmoran@acm.org]

The XOR of the parities equals the parity of the XORed bytes.
Thus the code can be shortened:

>  MOV AL, DataLo  ; load a byte
>  AND AL, AL      ; set PF
  change AND above to XOR AL,DataHi
>  LAHF            ; load flags byte
>  SHR AH, 2       ; shift PF into bit 0
>  AND AH, 1       ; mask off all other bits
>  MOV DL, AH      ; result into DL
  drop the following lines
>  MOV AL, DataHi
>  AND AL, AL
>  LAHF
>  SHR AH, 2
>  AND AH, 1
>  XOR DL, AH      ; parities must be XORed to get cumulative result