Maybe after a few more days check out the MOVC instructions. One variant makes it easy to look up values from a fixed table in code memory. Using this technique, you could collapse your gigantic 'display_bcd' routine into just a few lines. An example follows. You'd replace the TIMES_3_TABLE with a table containing the ten magic values you need to load into P1 for each of the ten decimal digits.

You might also want to check out the JMP @A+DPTR instruction. In a similar fashion (using indirection through a table), it lets you jump to various points in your program based on the current contents of the accumulator.

-- Russ

;------------------------------------------------------------------------------
;			       MULTIPLY_BY_THREE
;------------------------------------------------------------------------------
; DESCRIPTION:	This routine multiplies the accumulator by three, using a table
;		lookup technique.  (This is intended only to demonstrate the
;		table lookup technique; there are lots better ways to multiply
;		by three!)
;------------------------------------------------------------------------------

TIMES_3_TABLE:	DB	0, 3, 6, 9, 12, 15

MULTIPLY_BY_THREE:
		MOV	DPTR,#TIMES_3_TABLE	; Point DPTR at lookup table
		MOVC	A,@A+DPTR		; Grab the value indexed by A
		RET				; Done