Hi Craig, I think the error you speak of is the missing debounce but the assignment had two parts, write one program with debounce and one without. Either way my code doesn't seem to work. Raghu has given me another idea which I will work on next. In the meantime here is my code with the debounce: To clear up some confusion the first three lines work together to set up port A as an input, similiarly the next three set up port E as an output. The professor recommended a 250ms delay for debounce, perhaps this is overkill but can it hurt?

.ORG 2000H
MOV A,#9FH ;SET UP
MOV DPTR,#0F803H ; PORT A
MOVX @DPTR,A ; AS AN INPUT
MOV A,#89H ;SET UP
MOV DPTR,#0F903H ; PORT E
MOVX @DPTR,A ; AS AN OUTPUT
MOV 40H,#00 ;CLEAR FLAG-IS LED ON OR OFF
MOV A,#0FFH
MOV DPTR,#0F901H ;POINT TO PORT E
MOVX @DPTR,A ;TURN OFF ALL LED ATTACHED TO PORT E
DELAY:ACALL DLY250 ;CALL DELAY (SWITCH BOUNCE)
READ:MOV DPTR,#0F800H ;POINT TO PORT A
MOVX A,@DPTR
JNZ DELAY
MOV A,40H ;MONITOR FLAG
JNZ CLEAR ;
INC 40H ;SET FLAG
MOV DPTR,#0F901H ;POINT TO PORT E
MOV A,#0FEH ;
MOVX @DPTR,A ;TURN ON LED
SJMP DELAY
CLEAR:DEC 40H ;CLEAR FLAG
MOV DPTR,#0F901H ;POINT TO PORT E
MOV A,#0FFH ;
MOVX @DPTR,A ;TURN OFF LED
SJMP DELAY

DLY250:MOV R3,#3
LOOP:MOV R4,#150
LOOP1:MOV R5,#255
LOOP2:NOP
DJNZ R5,LOOP2
DJNZ R4,LOOP1
DJNZ R3,LOOP
RET