diff --git a/hw/timer/Makefile.objs b/hw/timer/Makefile.objs
index 133bd0d..803fde7 100644
--- a/hw/timer/Makefile.objs
+++ b/hw/timer/Makefile.objs
@@ -6,6 +6,9 @@ common-obj-$(CONFIG_DS1338) += ds1338.o
 common-obj-$(CONFIG_HPET) += hpet.o
 common-obj-$(CONFIG_I8254) += i8254_common.o i8254.o
 common-obj-$(CONFIG_M48T59) += m48t59.o
+ifeq ($(CONFIG_ISA_BUS),y)
+common-obj-$(CONFIG_M48T59) += m48t59-isa.o
+endif
 common-obj-$(CONFIG_PL031) += pl031.o
 common-obj-$(CONFIG_PUV3) += puv3_ost.o
 common-obj-$(CONFIG_TWL92230) += twl92230.o
diff --git a/hw/timer/m48t59-internal.h b/hw/timer/m48t59-internal.h
new file mode 100644
index 0000000..c50f134
--- /dev/null
+++ b/hw/timer/m48t59-internal.h
@@ -0,0 +1,82 @@
+/*
+ * QEMU M48T59 and M48T08 NVRAM emulation (common header)
+ *
+ * Copyright (c) 2003-2005, 2007 Jocelyn Mayer
+ * Copyright (c) 2013 Hervé Poussineau
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef HW_M48T59_H
+#define HW_M48T59_H 1
+
+//#define DEBUG_NVRAM
+
+#if defined(DEBUG_NVRAM)
+#define NVRAM_PRINTF(fmt, ...) do { printf(fmt , ## __VA_ARGS__); } while (0)
+#else
+#define NVRAM_PRINTF(fmt, ...) do { } while (0)
+#endif
+
+/*
+ * The M48T02, M48T08 and M48T59 chips are very similar. The newer '59 has
+ * alarm and a watchdog timer and related control registers. In the
+ * PPC platform there is also a nvram lock function.
+ */
+
+typedef struct M48txxInfo {
+    const char *bus_name;
+    uint32_t model; /* 2 = m48t02, 8 = m48t08, 59 = m48t59 */
+    uint32_t size;
+} M48txxInfo;
+
+typedef struct M48t59State {
+    /* Hardware parameters */
+    qemu_irq IRQ;
+    MemoryRegion iomem;
+    uint32_t size;
+    int32_t base_year;
+    /* RTC management */
+    time_t   time_offset;
+    time_t   stop_time;
+    /* Alarm & watchdog */
+    struct tm alarm;
+    QEMUTimer *alrm_timer;
+    QEMUTimer *wd_timer;
+    /* NVRAM storage */
+    uint8_t *buffer;
+    /* Model parameters */
+    uint32_t model; /* 2 = m48t02, 8 = m48t08, 59 = m48t59 */
+    /* NVRAM storage */
+    uint16_t addr;
+    uint8_t  lock;
+} M48t59State;
+
+uint32_t m48t59_read(M48t59State *NVRAM, uint32_t addr);
+void m48t59_write(M48t59State *NVRAM, uint32_t addr, uint32_t val);
+void m48t59_reset_common(M48t59State *NVRAM);
+void m48t59_realize_common(M48t59State *s, Error **errp);
+
+static inline void m48t59_toggle_lock(M48t59State *NVRAM, int lock)
+{
+    NVRAM->lock ^= 1 << lock;
+}
+
+extern const MemoryRegionOps m48t59_io_ops;
+
+#endif /* HW_M48T59_H */
diff --git a/hw/timer/m48t59-isa.c b/hw/timer/m48t59-isa.c
new file mode 100644
index 0000000..3a521dc
--- /dev/null
+++ b/hw/timer/m48t59-isa.c
@@ -0,0 +1,180 @@
+/*
+ * QEMU M48T59 and M48T08 NVRAM emulation (ISA bus interface
+ *
+ * Copyright (c) 2003-2005, 2007 Jocelyn Mayer
+ * Copyright (c) 2013 Hervé Poussineau
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "hw/isa/isa.h"
+#include "hw/timer/m48t59.h"
+#include "m48t59-internal.h"
+
+#define TYPE_M48TXX_ISA "isa-m48txx"
+#define M48TXX_ISA_GET_CLASS(obj) \
+    OBJECT_GET_CLASS(M48txxISADeviceClass, (obj), TYPE_M48TXX_ISA)
+#define M48TXX_ISA_CLASS(klass) \
+    OBJECT_CLASS_CHECK(M48txxISADeviceClass, (klass), TYPE_M48TXX_ISA)
+#define M48TXX_ISA(obj) \
+    OBJECT_CHECK(M48txxISAState, (obj), TYPE_M48TXX_ISA)
+
+typedef struct M48txxISAState {
+    ISADevice parent_obj;
+    M48t59State state;
+    uint32_t io_base;
+    MemoryRegion io;
+} M48txxISAState;
+
+typedef struct M48txxISADeviceClass {
+    ISADeviceClass parent_class;
+    M48txxInfo info;
+} M48txxISADeviceClass;
+
+static M48txxInfo m48txx_isa_info[] = {
+    {
+        .bus_name = "isa-m48t59",
+        .model = 59,
+        .size = 0x2000,
+    }
+};
+
+Nvram *m48t59_init_isa(ISABus *bus, uint32_t io_base, uint16_t size,
+                       int base_year, int model)
+{
+    DeviceState *dev;
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(m48txx_isa_info); i++) {
+        if (m48txx_isa_info[i].size != size ||
+            m48txx_isa_info[i].model != model) {
+            continue;
+        }
+
+        dev = DEVICE(isa_create(bus, m48txx_isa_info[i].bus_name));
+        qdev_prop_set_uint32(dev, "iobase", io_base);
+        qdev_prop_set_int32(dev, "base-year", base_year);
+        qdev_init_nofail(dev);
+        return NVRAM(dev);
+    }
+
+    assert(false);
+    return NULL;
+}
+
+static uint32_t m48txx_isa_read(Nvram *obj, uint32_t addr)
+{
+    M48txxISAState *d = M48TXX_ISA(obj);
+    return m48t59_read(&d->state, addr);
+}
+
+static void m48txx_isa_write(Nvram *obj, uint32_t addr, uint32_t val)
+{
+    M48txxISAState *d = M48TXX_ISA(obj);
+    m48t59_write(&d->state, addr, val);
+}
+
+static void m48txx_isa_toggle_lock(Nvram *obj, int lock)
+{
+    M48txxISAState *d = M48TXX_ISA(obj);
+    m48t59_toggle_lock(&d->state, lock);
+}
+
+static Property m48t59_isa_properties[] = {
+    DEFINE_PROP_INT32("base-year", M48txxISAState, state.base_year, 0),
+    DEFINE_PROP_UINT32("iobase", M48txxISAState, io_base, 0x74),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void m48t59_reset_isa(DeviceState *d)
+{
+    M48txxISAState *isa = M48TXX_ISA(d);
+    M48t59State *NVRAM = &isa->state;
+
+    m48t59_reset_common(NVRAM);
+}
+
+static void m48t59_isa_realize(DeviceState *dev, Error **errp)
+{
+    M48txxISADeviceClass *u = M48TXX_ISA_GET_CLASS(dev);
+    ISADevice *isadev = ISA_DEVICE(dev);
+    M48txxISAState *d = M48TXX_ISA(dev);
+    M48t59State *s = &d->state;
+
+    s->model = u->info.model;
+    s->size = u->info.size;
+    isa_init_irq(isadev, &s->IRQ, 8);
+    m48t59_realize_common(s, errp);
+    memory_region_init_io(&d->io, OBJECT(dev), &m48t59_io_ops, s, "m48t59", 4);
+    if (d->io_base != 0) {
+        isa_register_ioport(isadev, &d->io, d->io_base);
+    }
+}
+
+static void m48txx_isa_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    NvramClass *nc = NVRAM_CLASS(klass);
+
+    dc->realize = m48t59_isa_realize;
+    dc->reset = m48t59_reset_isa;
+    dc->props = m48t59_isa_properties;
+    nc->read = m48txx_isa_read;
+    nc->write = m48txx_isa_write;
+    nc->toggle_lock = m48txx_isa_toggle_lock;
+}
+
+static void m48txx_isa_concrete_class_init(ObjectClass *klass, void *data)
+{
+    M48txxISADeviceClass *u = M48TXX_ISA_CLASS(klass);
+    M48txxInfo *info = data;
+
+    u->info = *info;
+}
+
+static const TypeInfo m48txx_isa_type_info = {
+    .name = TYPE_M48TXX_ISA,
+    .parent = TYPE_ISA_DEVICE,
+    .instance_size = sizeof(M48txxISAState),
+    .abstract = true,
+    .class_init = m48txx_isa_class_init,
+    .interfaces = (InterfaceInfo[]) {
+        { TYPE_NVRAM },
+        { }
+    }
+};
+
+static void m48t59_isa_register_types(void)
+{
+    TypeInfo isa_type_info = {
+        .parent = TYPE_M48TXX_ISA,
+        .class_size = sizeof(M48txxISADeviceClass),
+        .class_init = m48txx_isa_concrete_class_init,
+    };
+    int i;
+
+    type_register_static(&m48txx_isa_type_info);
+
+    for (i = 0; i < ARRAY_SIZE(m48txx_isa_info); i++) {
+        isa_type_info.name = m48txx_isa_info[i].bus_name;
+        isa_type_info.class_data = &m48txx_isa_info[i];
+        type_register(&isa_type_info);
+    }
+}
+
+type_init(m48t59_isa_register_types)
diff --git a/hw/timer/m48t59.c b/hw/timer/m48t59.c
index 8ab683d..ac90734 100644
--- a/hw/timer/m48t59.c
+++ b/hw/timer/m48t59.c
@@ -27,16 +27,9 @@
 #include "qemu/timer.h"
 #include "sysemu/sysemu.h"
 #include "hw/sysbus.h"
-#include "hw/isa/isa.h"
 #include "exec/address-spaces.h"
 
-//#define DEBUG_NVRAM
-
-#if defined(DEBUG_NVRAM)
-#define NVRAM_PRINTF(fmt, ...) do { printf(fmt , ## __VA_ARGS__); } while (0)
-#else
-#define NVRAM_PRINTF(fmt, ...) do { } while (0)
-#endif
+#include "m48t59-internal.h"
 
 #define TYPE_M48TXX_SYS_BUS "sysbus-m48txx"
 #define M48TXX_SYS_BUS_GET_CLASS(obj) \
@@ -46,27 +39,6 @@
 #define M48TXX_SYS_BUS(obj) \
     OBJECT_CHECK(M48txxSysBusState, (obj), TYPE_M48TXX_SYS_BUS)
 
-#define TYPE_M48TXX_ISA "isa-m48txx"
-#define M48TXX_ISA_GET_CLASS(obj) \
-    OBJECT_GET_CLASS(M48txxISADeviceClass, (obj), TYPE_M48TXX_ISA)
-#define M48TXX_ISA_CLASS(klass) \
-    OBJECT_CLASS_CHECK(M48txxISADeviceClass, (klass), TYPE_M48TXX_ISA)
-#define M48TXX_ISA(obj) \
-    OBJECT_CHECK(M48txxISAState, (obj), TYPE_M48TXX_ISA)
-
-/*
- * The M48T02, M48T08 and M48T59 chips are very similar. The newer '59 has
- * alarm and a watchdog timer and related control registers. In the
- * PPC platform there is also a nvram lock function.
- */
-
-typedef struct M48txxInfo {
-    const char *isa_name;
-    const char *sysbus_name;
-    uint32_t model; /* 2 = m48t02, 8 = m48t08, 59 = m48t59 */
-    uint32_t size;
-} M48txxInfo;
-
 /*
  * Chipset docs:
  * http://www.st.com/stonline/products/literature/ds/2410/m48t02.pdf
@@ -74,40 +46,6 @@ typedef struct M48txxInfo {
  * http://www.st.com/stonline/products/literature/od/7001/m48t59y.pdf
  */
 
-typedef struct M48t59State {
-    /* Hardware parameters */
-    qemu_irq IRQ;
-    MemoryRegion iomem;
-    uint32_t size;
-    int32_t base_year;
-    /* RTC management */
-    time_t   time_offset;
-    time_t   stop_time;
-    /* Alarm & watchdog */
-    struct tm alarm;
-    QEMUTimer *alrm_timer;
-    QEMUTimer *wd_timer;
-    /* NVRAM storage */
-    uint8_t *buffer;
-    /* Model parameters */
-    uint32_t model; /* 2 = m48t02, 8 = m48t08, 59 = m48t59 */
-    /* NVRAM storage */
-    uint16_t addr;
-    uint8_t  lock;
-} M48t59State;
-
-typedef struct M48txxISAState {
-    ISADevice parent_obj;
-    M48t59State state;
-    uint32_t io_base;
-    MemoryRegion io;
-} M48txxISAState;
-
-typedef struct M48txxISADeviceClass {
-    ISADeviceClass parent_class;
-    M48txxInfo info;
-} M48txxISADeviceClass;
-
 typedef struct M48txxSysBusState {
     SysBusDevice parent_obj;
     M48t59State state;
@@ -119,21 +57,17 @@ typedef struct M48txxSysBusDeviceClass {
     M48txxInfo info;
 } M48txxSysBusDeviceClass;
 
-static M48txxInfo m48txx_info[] = {
+static M48txxInfo m48txx_sysbus_info[] = {
     {
-        .sysbus_name = "sysbus-m48t02",
+        .bus_name = "sysbus-m48t02",
         .model = 2,
         .size = 0x800,
     },{
-        .sysbus_name = "sysbus-m48t08",
+        .bus_name = "sysbus-m48t08",
         .model = 8,
         .size = 0x2000,
     },{
-        .sysbus_name = "sysbus-m48t59",
-        .model = 59,
-        .size = 0x2000,
-    },{
-        .isa_name = "isa-m48t59",
+        .bus_name = "sysbus-m48t59",
         .model = 59,
         .size = 0x2000,
     }
@@ -245,7 +179,7 @@ static void set_up_watchdog(M48t59State *NVRAM, uint8_t value)
 }
 
 /* Direct access to NVRAM */
-static void m48t59_write(M48t59State *NVRAM, uint32_t addr, uint32_t val)
+void m48t59_write(M48t59State *NVRAM, uint32_t addr, uint32_t val)
 {
     struct tm tm;
     int tmp;
@@ -410,7 +344,7 @@ static void m48t59_write(M48t59State *NVRAM, uint32_t addr, uint32_t val)
     }
 }
 
-static uint32_t m48t59_read(M48t59State *NVRAM, uint32_t addr)
+uint32_t m48t59_read(M48t59State *NVRAM, uint32_t addr)
 {
     struct tm tm;
     uint32_t retval = 0xFF;
@@ -514,11 +448,6 @@ static uint32_t m48t59_read(M48t59State *NVRAM, uint32_t addr)
     return retval;
 }
 
-static void m48t59_toggle_lock(M48t59State *NVRAM, int lock)
-{
-    NVRAM->lock ^= 1 << lock;
-}
-
 /* IO access to NVRAM */
 static void NVRAM_writeb(void *opaque, hwaddr addr, uint64_t val,
                          unsigned size)
@@ -638,7 +567,7 @@ static const VMStateDescription vmstate_m48t59 = {
     }
 };
 
-static void m48t59_reset_common(M48t59State *NVRAM)
+void m48t59_reset_common(M48t59State *NVRAM)
 {
     NVRAM->addr = 0;
     NVRAM->lock = 0;
@@ -649,14 +578,6 @@ static void m48t59_reset_common(M48t59State *NVRAM)
         timer_del(NVRAM->wd_timer);
 }
 
-static void m48t59_reset_isa(DeviceState *d)
-{
-    M48txxISAState *isa = M48TXX_ISA(d);
-    M48t59State *NVRAM = &isa->state;
-
-    m48t59_reset_common(NVRAM);
-}
-
 static void m48t59_reset_sysbus(DeviceState *d)
 {
     M48txxSysBusState *sys = M48TXX_SYS_BUS(d);
@@ -665,7 +586,7 @@ static void m48t59_reset_sysbus(DeviceState *d)
     m48t59_reset_common(NVRAM);
 }
 
-static const MemoryRegionOps m48t59_io_ops = {
+const MemoryRegionOps m48t59_io_ops = {
     .read = NVRAM_readb,
     .write = NVRAM_writeb,
     .impl = {
@@ -684,14 +605,13 @@ Nvram *m48t59_init(qemu_irq IRQ, hwaddr mem_base,
     SysBusDevice *s;
     int i;
 
-    for (i = 0; i < ARRAY_SIZE(m48txx_info); i++) {
-        if (!m48txx_info[i].sysbus_name ||
-            m48txx_info[i].size != size ||
-            m48txx_info[i].model != model) {
+    for (i = 0; i < ARRAY_SIZE(m48txx_sysbus_info); i++) {
+        if (m48txx_sysbus_info[i].size != size ||
+            m48txx_sysbus_info[i].model != model) {
             continue;
         }
 
-        dev = qdev_create(NULL, m48txx_info[i].sysbus_name);
+        dev = qdev_create(NULL, m48txx_sysbus_info[i].bus_name);
         qdev_prop_set_int32(dev, "base-year", base_year);
         qdev_init_nofail(dev);
         s = SYS_BUS_DEVICE(dev);
@@ -711,31 +631,7 @@ Nvram *m48t59_init(qemu_irq IRQ, hwaddr mem_base,
     return NULL;
 }
 
-Nvram *m48t59_init_isa(ISABus *bus, uint32_t io_base, uint16_t size,
-                       int base_year, int model)
-{
-    DeviceState *dev;
-    int i;
-
-    for (i = 0; i < ARRAY_SIZE(m48txx_info); i++) {
-        if (!m48txx_info[i].isa_name ||
-            m48txx_info[i].size != size ||
-            m48txx_info[i].model != model) {
-            continue;
-        }
-
-        dev = DEVICE(isa_create(bus, m48txx_info[i].isa_name));
-        qdev_prop_set_uint32(dev, "iobase", io_base);
-        qdev_prop_set_int32(dev, "base-year", base_year);
-        qdev_init_nofail(dev);
-        return NVRAM(dev);
-    }
-
-    assert(false);
-    return NULL;
-}
-
-static void m48t59_realize_common(M48t59State *s, Error **errp)
+void m48t59_realize_common(M48t59State *s, Error **errp)
 {
     s->buffer = g_malloc0(s->size);
     if (s->model == 59) {
@@ -747,23 +643,6 @@ static void m48t59_realize_common(M48t59State *s, Error **errp)
     vmstate_register(NULL, -1, &vmstate_m48t59, s);
 }
 
-static void m48t59_isa_realize(DeviceState *dev, Error **errp)
-{
-    M48txxISADeviceClass *u = M48TXX_ISA_GET_CLASS(dev);
-    ISADevice *isadev = ISA_DEVICE(dev);
-    M48txxISAState *d = M48TXX_ISA(dev);
-    M48t59State *s = &d->state;
-
-    s->model = u->info.model;
-    s->size = u->info.size;
-    isa_init_irq(isadev, &s->IRQ, 8);
-    m48t59_realize_common(s, errp);
-    memory_region_init_io(&d->io, OBJECT(dev), &m48t59_io_ops, s, "m48t59", 4);
-    if (d->io_base != 0) {
-        isa_register_ioport(isadev, &d->io, d->io_base);
-    }
-}
-
 static int m48t59_init1(SysBusDevice *dev)
 {
     M48txxSysBusDeviceClass *u = M48TXX_SYS_BUS_GET_CLASS(dev);
@@ -790,51 +669,6 @@ static int m48t59_init1(SysBusDevice *dev)
     return 0;
 }
 
-static uint32_t m48txx_isa_read(Nvram *obj, uint32_t addr)
-{
-    M48txxISAState *d = M48TXX_ISA(obj);
-    return m48t59_read(&d->state, addr);
-}
-
-static void m48txx_isa_write(Nvram *obj, uint32_t addr, uint32_t val)
-{
-    M48txxISAState *d = M48TXX_ISA(obj);
-    m48t59_write(&d->state, addr, val);
-}
-
-static void m48txx_isa_toggle_lock(Nvram *obj, int lock)
-{
-    M48txxISAState *d = M48TXX_ISA(obj);
-    m48t59_toggle_lock(&d->state, lock);
-}
-
-static Property m48t59_isa_properties[] = {
-    DEFINE_PROP_INT32("base-year", M48txxISAState, state.base_year, 0),
-    DEFINE_PROP_UINT32("iobase", M48txxISAState, io_base, 0x74),
-    DEFINE_PROP_END_OF_LIST(),
-};
-
-static void m48txx_isa_class_init(ObjectClass *klass, void *data)
-{
-    DeviceClass *dc = DEVICE_CLASS(klass);
-    NvramClass *nc = NVRAM_CLASS(klass);
-
-    dc->realize = m48t59_isa_realize;
-    dc->reset = m48t59_reset_isa;
-    dc->props = m48t59_isa_properties;
-    nc->read = m48txx_isa_read;
-    nc->write = m48txx_isa_write;
-    nc->toggle_lock = m48txx_isa_toggle_lock;
-}
-
-static void m48txx_isa_concrete_class_init(ObjectClass *klass, void *data)
-{
-    M48txxISADeviceClass *u = M48TXX_ISA_CLASS(klass);
-    M48txxInfo *info = data;
-
-    u->info = *info;
-}
-
 static uint32_t m48txx_sysbus_read(Nvram *obj, uint32_t addr)
 {
     M48txxSysBusState *d = M48TXX_SYS_BUS(obj);
@@ -898,18 +732,6 @@ static const TypeInfo m48txx_sysbus_type_info = {
     }
 };
 
-static const TypeInfo m48txx_isa_type_info = {
-    .name = TYPE_M48TXX_ISA,
-    .parent = TYPE_ISA_DEVICE,
-    .instance_size = sizeof(M48txxISAState),
-    .abstract = true,
-    .class_init = m48txx_isa_class_init,
-    .interfaces = (InterfaceInfo[]) {
-        { TYPE_NVRAM },
-        { }
-    }
-};
-
 static void m48t59_register_types(void)
 {
     TypeInfo sysbus_type_info = {
@@ -917,29 +739,15 @@ static void m48t59_register_types(void)
         .class_size = sizeof(M48txxSysBusDeviceClass),
         .class_init = m48txx_sysbus_concrete_class_init,
     };
-    TypeInfo isa_type_info = {
-        .parent = TYPE_M48TXX_ISA,
-        .class_size = sizeof(M48txxISADeviceClass),
-        .class_init = m48txx_isa_concrete_class_init,
-    };
     int i;
 
     type_register_static(&nvram_info);
     type_register_static(&m48txx_sysbus_type_info);
-    type_register_static(&m48txx_isa_type_info);
 
-    for (i = 0; i < ARRAY_SIZE(m48txx_info); i++) {
-        if (m48txx_info[i].sysbus_name) {
-            sysbus_type_info.name = m48txx_info[i].sysbus_name;
-            sysbus_type_info.class_data = &m48txx_info[i];
-            type_register(&sysbus_type_info);
-        }
-
-        if (m48txx_info[i].isa_name) {
-            isa_type_info.name = m48txx_info[i].isa_name;
-            isa_type_info.class_data = &m48txx_info[i];
-            type_register(&isa_type_info);
-        }
+    for (i = 0; i < ARRAY_SIZE(m48txx_sysbus_info); i++) {
+        sysbus_type_info.name = m48txx_sysbus_info[i].bus_name;
+        sysbus_type_info.class_data = &m48txx_sysbus_info[i];
+        type_register(&sysbus_type_info);
     }
 }
 
