update reset routine based on c64 prg pp263-269

c64/kernal/cartridge_check.s

@@ -0,0 +1,13 @@
+; c64 prg p263
+
+cartridge_check:
+	ldx #$04
+cartridge_check_l1:
+	lda $8002,x
+	cmp cartridge_signature,x
+	bne no_cartridge
+	dex
+	bpl cartridge_check_l1
+	jmp ($8000)
+cartridge_signature:
+	.byte $C3,$C2,$CD,$38,$30