Hello Michael,

I took your picture and typed it out so that 
others could have a test listing of it rather 
than a graphical listing.

I complied it with a51.exe and tested it with jsim.exe. 
It worked successfully.

Regards,

Charles Bannister


.org 0x00
Reset: ljmp Main

.org 0x40
Main: 	acall	decode
here:	sjmp	here
decode:	mov	a, p0
	anl 	a, #0x0F
	rl	a
	push	acc
	add	a, #(lookup-lab1)
lab1:	movc	a, @a+pc
	mov	p2, a
	pop	acc
	add	a, #(lookup-lab2+1)
lab2:	movc	a, @a+pc
	mov	p1, a
	ret
lookup:
.dw	0001h, 0002h, 0004h, 0008h
.dw	0010h, 0020h, 0040h, 0080h
.dw	0100h, 0200h, 0400h, 0800h
.dw	1000h, 2000h, 4000h, 8000h

;; hex file listing for above program
:03000000020040BB
:10004000114480FEE580540F23C0E0240B83F5A00B
:10005000D0E0240583F5902200010002000400088E
:100060000010002000400080010002000400080091
:08007000100020004000800098
:00000001FF