#define SYNC_MODE 0 /* Synchronous transfer mode */
-#if DEBUG
+#ifdef DEBUG
#undef NCR53C406A_DEBUG
#define NCR53C406A_DEBUG 1
#endif
static void *bios_base;
#endif
-#if PORT_BASE
+#ifdef PORT_BASE
static int port_base = PORT_BASE;
#else
static int port_base;
#endif
-#if IRQ_LEV
+#ifdef IRQ_LEV
static int irq_level = IRQ_LEV;
#else
static int irq_level = -1; /* 0 is 'no irq', so use -1 for 'uninitialized' */