> __CONFIG       b'11111101110001'

'noob, it would be really helpful if you use more understandable
code, like

   list P = 16F877
   include "P16F877.inc"

  __CONFIG _CP_OFF & _WRT_ENABLE_ON & _HS_OSC &
_WDT_OFF & _PWRTE_OFF & _BODEN_OFF & _LVP_OFF &
_CPD_OFF & _DEBUG_OFF

I doubt if any knows off-hand what your CONFIG does. It could be
worked out a bit at a time but, well, you know.......

Using the .inc file also means you don't have to do these, or any other,
processor definitions

STATUS equ 0x83
PORTB equ 0x06
PORTA equ 0x05
ADCON0 equ 0x1F
ADCON1 equ 0x9F

Typing anything that important is a killer typo just waiting to happen

> bcf STATUS,5 ;select banks 0+1
> bcf ADCON0,0 ;disable A/D module
> movlw 0x06
> movwf ADCON1 ;set all of PORTA to digital

Use banksel. You'll see from that definition above that ADCON1 is
in Bank1 (address is between 0x7f and 0x90). What you have done
up there is probably not change into Bank1 (depends what was in
Status before, and that is not a reliable way to do things)

banksel adcon0 ;ADCON0 in Bank0
bcf adcon0,adon ;A2D off
banksel adcon1 ;ADCON1 in Bank1
movlw b'00000110' ;PortA as digital
movwf adcon1

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