clean up dummy stage 2 a bit

boot1.s

@@ -1,11 +1,10 @@
-org 0x7c00  
+org 0x8200
 bits 16
 
   ; Reveal the true nature of jen
   xor bx, bx
-  mov ax, 17
 loop:
-  cmp bx, ax
+  cmp bx, WOMBLE_LEN
   jae done
   lea si, [womble + bx]
   mov dh, [si]
@@ -18,6 +17,5 @@ loop:
 done:
   hlt
 
-womble:
-  db "jen is a womble!"
-
+womble     db "jen is a womble!"
+WOMBLE_LEN equ $ - womble