In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Johnson Rod wrote:

HTH, you're my savior, that algoritm is sweet. i'll have to read up on log algorithms bc that seems to be some powerful juju.
this is my revised procedure.

Gray_To_Binary_Log:
  cx = __PARAM1  

'REG = (REG) XOR (REG >> 4) (>> means right shift, shifting zeros into the left side)
'REG = (REG) XOR (REG >> 2)
'REG = (REG) XOR (REG >> 1)

ASM
	mov	ax, cx
	clc	
	rr	cx
	clc	
	rr	cx
	clc	
	rr	cx
	clc	
	rr	cx
	xor	ax, cx
	mov	cx, ax
	clc	
	rr	cx
	clc	
	rr	cx
	xor	ax, cx
	mov	cx, ax
	clc	
	rr	cx
	xor	ax, cx
ENDASM
	RETURN ax

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