org 1000h             ; set base of code to 1000h
  bcc start             ; jump target
  jmp start
  jmp start
  rts                   ; return from subroutine
  rts                   ; return from subroutine
;  start equ *           ; macro reference
;  start equ 70h
start:
  nop                   ; no operation
  nop                   ; no operation
  nop                   ; no operation
  nop                   ; no operation
  bcc start
  jmp start
  rts                   ; return from subroutine   
  jmp foo
  org 2000h
  nop
  nop
  nop
  nop
  jmp start
foo: