diff --git a/contiki-cpc/arch/crt0.s b/contiki-cpc/arch/crt0.s
index 23b8513..3364bc3 100644
--- a/contiki-cpc/arch/crt0.s
+++ b/contiki-cpc/arch/crt0.s
@@ -6,7 +6,6 @@
 
     .module crt0
 	.globl	_main
-;	.globl __jpbc
 	.globl _progend
 	.area	_HEADER (ABS)
 	;; Ordering of segments for the linker.
@@ -19,24 +18,21 @@
 
 _exit::
 	ret
-;__jpbc:
-;	push bc
-;	ret
 
 	.area _HOME
 	.area _CODE
 	.area _INITIALIZER
 	.area   _GSINIT (REL)
     .area   _GSFINAL (REL)
-_progend::
 
-	.area	_DATA (REL)
 	.area _INITIALIZED
+	.area _DATA
 	.area _BSEG
-	 .area   _BSS (REL)
-    	.area   _HEAP (REL)
+	.area _BSS (REL)
+    .area _HEAP (REL)
+_progend::
 	
-	.area   _GSINIT (REL)
+	.area _GSINIT (REL)
 gsinit::	
 	ld	bc, #l__INITIALIZER
 	ld	a, b
@@ -46,6 +42,20 @@
 	ld	hl, #s__INITIALIZER
 	ldir
 gsinit_next:
+; Clear BSS sections
+	ld hl,#s__DATA
+	ld (hl),#0
+	ld de,#s__DATA
+	inc de
+	ld bc,#l__DATA
+	ldir
+
+; Initialize disk ROM
+	ld hl,#0xabff
+	ld de,#0x40
+	ld c,#7
+	call 0xbcce
 
 	.area   _GSFINAL
-	ret
+	; After the ROMs are initialized, initialize the heap.
+	 jp __sdcc_heap_init