_CONFIG1 is for configuration word 1. If you take a look in your C:\Program Files\Microchip\MPASM Suite and look at the .inc file for the chip you are using, at the bottom of the inc file, you will see:

Code:
;==========================================================================
;
;       Configuration Bits
;
;==========================================================================
_CONFIG1                     EQU     H'2007'
_CONFIG2                     EQU     H'2008'

;----- Configuration Word1 ------------------------------------------------

_DEBUG_ON                    EQU     H'1FFF'
_DEBUG_OFF                   EQU     H'3FFF'
_LVP_ON                 EQU     H'3FFF'
_LVP_OFF             EQU     H'2FFF'
_FCMEN_ON                    EQU     H'3FFF'
_FCMEN_OFF                   EQU     H'37FF'
_IESO_ON                     EQU     H'3FFF'
_IESO_OFF                    EQU     H'3BFF'
_BOR_ON                      EQU     H'3FFF'
_BOR_NSLEEP                  EQU     H'3EFF'
_BOR_SBODEN                  EQU     H'3DFF'
_BOR_OFF                     EQU     H'3CFF'
_CPD_ON                      EQU     H'3F7F'
_CPD_OFF                     EQU     H'3FFF'
_CP_ON                       EQU     H'3FBF'
_CP_OFF                      EQU     H'3FFF'
_MCLRE_ON                    EQU     H'3FFF'
_MCLRE_OFF                   EQU     H'3FDF'
_PWRTE_ON                    EQU     H'3FEF'
_PWRTE_OFF                   EQU     H'3FFF'
_WDT_ON                      EQU     H'3FFF'
_WDT_OFF                     EQU     H'3FF7'
_LP_OSC                      EQU     H'3FF8'
_XT_OSC                      EQU     H'3FF9'
_HS_OSC                      EQU     H'3FFA'
_EC_OSC                      EQU     H'3FFB'
_INTRC_OSC_NOCLKOUT          EQU     H'3FFC'
_INTRC_OSC_CLKOUT            EQU     H'3FFD'
_EXTRC_OSC_NOCLKOUT          EQU     H'3FFE'
_EXTRC_OSC_CLKOUT            EQU     H'3FFF'
_INTOSCIO                    EQU     H'3FFC'
_INTOSC                      EQU     H'3FFD'
_EXTRCIO                     EQU     H'3FFE'
_EXTRC                       EQU     H'3FFF'

;----- Configuration Word2 ------------------------------------------------

_WRT_OFF                     EQU     H'3FFF'    ; No prog memmory write protection
_WRT_256                     EQU     H'3DFF'    ; First 256 prog memmory write protected
_WRT_1FOURTH                 EQU     H'3BFF'    ; First quarter prog memmory write protected
_WRT_HALF                    EQU     H'39FF'    ; First half memmory write protected

_BOR21V                      EQU     H'3EFF'
_BOR40V                      EQU     H'3FFF'
A couple of the configs are in configuration word 2. This gives Mpasm what it needs to know. If you were setting WRT_OFF, you would have to put it in another config line, like:

Code:

@ __config _CONFIG1, _INTRC_OSC_NOCLKOUT & _WDT_ON & _MCLRE_OFF & _LVP_OFF & _CP_OFF
@ __config _CONFIG2, _WRT_OFF
Here is some slightly condensed config info:
http://www.picbasic.co.uk/forum/cont...o-your-Program