diff --git a/src/fib.z80 b/src/fib.z80
index 06cabed..27fad6c 100644
--- a/src/fib.z80
+++ b/src/fib.z80
@@ -1,8 +1,8 @@
-.org $0000
+.org 0x1500
+	jp main
+
 main:
 init:
-	ld hl, out
-
 	ld a, (amount)
 	ld d, a
 
@@ -14,8 +14,7 @@ init:
 loop:
 	add a, b
 
-	ld (hl), a
-	inc hl
+	out 0x80, a
 
 	ld c, a
 	ld a, b
@@ -23,23 +22,9 @@ loop:
 
 	dec d
 	jp nz, loop
-
-verify_init:
-	ld hl, out
-
-	ld a, (amount)
-	ld d, a
-
-verify:
-	ld a, (hl)
-	inc hl
-
-	dec d
-	jp nz, verify
 	
 done:
-	halt
-
+	jp 0x0000
 
 amount:
 	.db 10
@@ -47,5 +32,3 @@ x:
 	.db 0
 y:
 	.db 1
-
-out .equ $1000
diff --git a/upload.py b/upload.py
index ec51057..cf739c0 100644
--- a/upload.py
+++ b/upload.py
@@ -29,7 +29,8 @@ def main():
 
             path = sys.argv[1]
             size = os.path.getsize(path)
-            ser.write([size])
+            ser.write([size & 0xFF])
+            ser.write([(size >> 8) & 0xFF])
             i = 0
             with open(path, "rb") as f:
                 for i in progressbar(range(size), "Upload: ", 40):