Erik thanks,

I have written a little test,

switch (U_MsgHndl_Box)
{
case 1:
P_Pointer = &PCcommBuffer[1 * MsgBoxSize];
break;

case 2:
P_Pointer = &PCcommBuffer[2 * MsgBoxSize];
break;

case 3:
P_Pointer = &PCcommBuffer[3 * MsgBoxSize];
break;

}

*P_Pointer = 0x02;


The next code is produced when i use
#pragma jump_switch /* force jump table code */

; p_msghndl.c 623 switch (U_MsgHndl_Box)
?LINE 623
MOV A,_53
DEC A
CJNE A,#03H,_58
_58:
JNC _49
MOV DPTR,#_52
MOV R2,A
ADD A,R2
ADD A,R2
JMP @A+DPTR
; p_msghndl.c 624 {
; p_msghndl.c 625 case 1:
?LINE 625
_44:
; p_msghndl.c 626 P_Pointer = &PCcommBuffer[1 * MsgBoxSize];
?LINE 626
MOV DPTR,#_57
MOV A,# HIGH (_PCcommBuffer+17)
MOVX @DPTR,A
MOV A,# LOW (_PCcommBuffer+17)
INC DPTR
MOVX @DPTR,A
; p_msghndl.c 627 break;
?LINE 627
SJMP _49
; p_msghndl.c 628
; p_msghndl.c 629 case 2:
?LINE 629
_45:
; p_msghndl.c 630 P_Pointer = &PCcommBuffer[2 * MsgBoxSize];
?LINE 630
MOV DPTR,#_57
MOV A,# HIGH (_PCcommBuffer+34)
MOVX @DPTR,A
MOV A,# LOW (_PCcommBuffer+34)
INC DPTR
MOVX @DPTR,A
; p_msghndl.c 631 break;
?LINE 631
SJMP _49
; p_msghndl.c 632
; p_msghndl.c 633 case 3:
?LINE 633
_46:
; p_msghndl.c 634 P_Pointer = &PCcommBuffer[3 * MsgBoxSize];
?LINE 634
MOV DPTR,#_57
MOV A,# HIGH (_PCcommBuffer+51)
MOVX @DPTR,A
MOV A,# LOW (_PCcommBuffer+51)
INC DPTR
MOVX @DPTR,A
; p_msghndl.c 635 break;
; p_msghndl.c 636
; p_msghndl.c 637 }
?LINE 637
_49:
; p_msghndl.c 638
; p_msghndl.c 639 *P_Pointer = 0x02;
?LINE 639
MOV DPTR,#_57
MOVX A,@DPTR
MOV R2,A
INC DPTR
MOVX A,@DPTR
MOV DPL,A
MOV DPH,R2
MOV A,#02H
MOVX @DPTR,A

As you see it could be more efficient.
Think I'll take the assembler wat or try to configure my compiler "BSO Tasking" to do it more straight.

Now I will kiss my wife.
See you tomorrow

Patrick