Ok I just red the replyes thanks!

I'm using my serial port on the PCB, the situation is this, my design works on an RS485 network I also have a serial interface display on the board but I had route it so I get connection to the RXD, TXD, PSEN, VCC, GND and RESET of the uc.
I'm using dip switches to isolate the reset from the PCB reset circuits because I have 4 sources of reset also I isolate the RXD and TXD in other words with a specific conditions on this switches I can have the uc connected to the PC and it is isolated from the rest of the electronics on the PCB so I'm building a cable with a MAX232 to convert the voltage to TTL levels so I don't have to reroute my PCB.
Now I'm confuse on this a code to jump to the boot will this go on the begging of my assembler program how I do this like an interruption? I have this on my software after I declare segments and variables.....

CSEG AT 00H ; ATEN. RESET
JMP INI

CSEG AT 0BH ; ATEN. TIMER 0
JMP DOG_INT

CSEG AT 23H
JMP INT_SERIAL ; ATEN. SERIAL-INT

CSEG AT 03H ; ATEN. EXT 0
JMP EXT0

CSEG AT 013H ; ATEN. EXT 1
JMP EXT1

CSEG AT 01BH ; ATEN. TIMER1
JMP TIMER1

CSEG AT 02BH ; ATEN. TIMER2
JMP TIMER2

RSEG PROGRAM


INI:
.
.
. software here
.

end

where do I put that instruction ???? to jump to the boot?

thanks again