diff --git a/hw/fdc.c b/hw/fdc.c
index a0236b7295..756d4cefd5 100644
--- a/hw/fdc.c
+++ b/hw/fdc.c
@@ -438,6 +438,9 @@ typedef struct FDCtrlSysBus {
 
 typedef struct FDCtrlISABus {
     ISADevice busdev;
+    uint32_t iobase;
+    uint32_t irq;
+    uint32_t dma;
     struct FDCtrl state;
     int32_t bootindexA;
     int32_t bootindexB;
@@ -1971,17 +1974,14 @@ static int isabus_fdc_init1(ISADevice *dev)
 {
     FDCtrlISABus *isa = DO_UPCAST(FDCtrlISABus, busdev, dev);
     FDCtrl *fdctrl = &isa->state;
-    int iobase = 0x3f0;
-    int isairq = 6;
-    int dma_chann = 2;
     int ret;
 
-    isa_register_portio_list(dev, iobase, fdc_portio_list, fdctrl, "fdc");
+    isa_register_portio_list(dev, isa->iobase, fdc_portio_list, fdctrl, "fdc");
 
-    isa_init_irq(&isa->busdev, &fdctrl->irq, isairq);
-    fdctrl->dma_chann = dma_chann;
+    isa_init_irq(&isa->busdev, &fdctrl->irq, isa->irq);
+    fdctrl->dma_chann = isa->dma;
 
-    qdev_set_legacy_instance_id(&dev->qdev, iobase, 2);
+    qdev_set_legacy_instance_id(&dev->qdev, isa->iobase, 2);
     ret = fdctrl_init_common(fdctrl);
 
     add_boot_device_path(isa->bootindexA, &dev->qdev, "/floppy@0");
@@ -2046,6 +2046,9 @@ static const VMStateDescription vmstate_isa_fdc ={
 };
 
 static Property isa_fdc_properties[] = {
+    DEFINE_PROP_HEX32("iobase", FDCtrlISABus, iobase, 0x3f0),
+    DEFINE_PROP_UINT32("irq", FDCtrlISABus, irq, 6),
+    DEFINE_PROP_UINT32("dma", FDCtrlISABus, dma, 2),
     DEFINE_PROP_DRIVE("driveA", FDCtrlISABus, state.drives[0].bs),
     DEFINE_PROP_DRIVE("driveB", FDCtrlISABus, state.drives[1].bs),
     DEFINE_PROP_INT32("bootindexA", FDCtrlISABus, bootindexA, -1),
diff --git a/hw/i82374.c b/hw/i82374.c
index 67298a39f5..4a922c3f4e 100644
--- a/hw/i82374.c
+++ b/hw/i82374.c
@@ -38,6 +38,7 @@ do { fprintf(stderr, "i82374 ERROR: " fmt , ## __VA_ARGS__); } while (0)
 
 typedef struct I82374State {
     uint8_t commands[8];
+    qemu_irq out;
 } I82374State;
 
 static const VMStateDescription vmstate_i82374 = {
@@ -99,7 +100,7 @@ static uint32_t i82374_read_descriptor(void *opaque, uint32_t nport)
 
 static void i82374_init(I82374State *s)
 {
-    DMA_init(1, NULL);
+    DMA_init(1, &s->out);
     memset(s->commands, 0, sizeof(s->commands));
 }
 
@@ -132,6 +133,8 @@ static int i82374_isa_init(ISADevice *dev)
 
     i82374_init(s);
 
+    qdev_init_gpio_out(&dev->qdev, &s->out, 1);
+
     return 0;
 }
 
diff --git a/hw/i82378.c b/hw/i82378.c
index faad1a365b..9b11d907eb 100644
--- a/hw/i82378.c
+++ b/hw/i82378.c
@@ -170,6 +170,7 @@ static void i82378_init(DeviceState *dev, I82378State *s)
 {
     ISABus *isabus = DO_UPCAST(ISABus, qbus, qdev_get_child_bus(dev, "isa.0"));
     ISADevice *pit;
+    ISADevice *isa;
     qemu_irq *out0_irq;
 
     /* This device has:
@@ -199,8 +200,8 @@ static void i82378_init(DeviceState *dev, I82378State *s)
     pcspk_init(isabus, pit);
 
     /* 2 82C37 (dma) */
-    DMA_init(1, &s->out[1]);
-    isa_create_simple(isabus, "i82374");
+    isa = isa_create_simple(isabus, "i82374");
+    qdev_connect_gpio_out(&isa->qdev, 0, s->out[1]);
 
     /* timer */
     isa_create_simple(isabus, "mc146818rtc");
diff --git a/hw/isa.h b/hw/isa.h
index 40373fb107..f7bc4b5a95 100644
--- a/hw/isa.h
+++ b/hw/isa.h
@@ -76,6 +76,11 @@ void isa_register_portio_list(ISADevice *dev, uint16_t start,
                               const MemoryRegionPortio *portio,
                               void *opaque, const char *name);
 
+static inline ISABus *isa_bus_from_device(ISADevice *d)
+{
+    return DO_UPCAST(ISABus, qbus, d->qdev.parent_bus);
+}
+
 extern target_phys_addr_t isa_mem_base;
 
 void isa_mmio_setup(MemoryRegion *mr, target_phys_addr_t size);
diff --git a/hw/ppc_prep.c b/hw/ppc_prep.c
index 9d8e6592e1..b1da114114 100644
--- a/hw/ppc_prep.c
+++ b/hw/ppc_prep.c
@@ -37,6 +37,7 @@
 #include "loader.h"
 #include "mc146818rtc.h"
 #include "blockdev.h"
+#include "arch_init.h"
 #include "exec-memory.h"
 
 //#define HARD_DEBUG_PPC_IO
@@ -85,38 +86,6 @@ static int ne2000_irq[NE2000_NB_MAX] = { 9, 10, 11, 3, 4, 5 };
 /* ISA IO ports bridge */
 #define PPC_IO_BASE 0x80000000
 
-/* PCI intack register */
-/* Read-only register (?) */
-static void PPC_intack_write (void *opaque, target_phys_addr_t addr,
-                              uint64_t value, unsigned size)
-{
-#if 0
-    printf("%s: 0x" TARGET_FMT_plx " => 0x%08" PRIx64 "\n", __func__, addr,
-           value);
-#endif
-}
-
-static uint64_t PPC_intack_read(void *opaque, target_phys_addr_t addr,
-                                unsigned size)
-{
-    uint32_t retval = 0;
-
-    if ((addr & 0xf) == 0)
-        retval = pic_read_irq(isa_pic);
-#if 0
-    printf("%s: 0x" TARGET_FMT_plx " <= %08" PRIx32 "\n", __func__, addr,
-           retval);
-#endif
-
-    return retval;
-}
-
-static const MemoryRegionOps PPC_intack_ops = {
-    .read = PPC_intack_read,
-    .write = PPC_intack_write,
-    .endianness = DEVICE_LITTLE_ENDIAN,
-};
-
 /* PowerPC control and status registers */
 #if 0 // Not used
 static struct {
@@ -491,7 +460,6 @@ static void ppc_prep_init (ram_addr_t ram_size,
     nvram_t nvram;
     M48t59State *m48t59;
     MemoryRegion *PPC_io_memory = g_new(MemoryRegion, 1);
-    MemoryRegion *intack = g_new(MemoryRegion, 1);
 #if 0
     MemoryRegion *xcsr = g_new(MemoryRegion, 1);
 #endif
@@ -684,9 +652,6 @@ static void ppc_prep_init (ram_addr_t ram_size,
     register_ioport_write(0x0092, 0x01, 1, &PREP_io_800_writeb, sysctrl);
     register_ioport_read(0x0800, 0x52, 1, &PREP_io_800_readb, sysctrl);
     register_ioport_write(0x0800, 0x52, 1, &PREP_io_800_writeb, sysctrl);
-    /* PCI intack location */
-    memory_region_init_io(intack, &PPC_intack_ops, NULL, "ppc-intack", 4);
-    memory_region_add_subregion(sysmem, 0xBFFFFFF0, intack);
     /* PowerPC control and status register group */
 #if 0
     memory_region_init_io(xcsr, &PPC_XCSR_ops, NULL, "ppc-xcsr", 0x1000);
@@ -716,6 +681,9 @@ static void ppc_prep_init (ram_addr_t ram_size,
 
     /* Special port to get debug messages from Open-Firmware */
     register_ioport_write(0x0F00, 4, 1, &PPC_debug_write, NULL);
+
+    /* Initialize audio subsystem */
+    audio_init(isa_bus, pci_bus);
 }
 
 static QEMUMachine prep_machine = {
diff --git a/hw/prep_pci.c b/hw/prep_pci.c
index 8b29da9948..38dbff44a1 100644
--- a/hw/prep_pci.c
+++ b/hw/prep_pci.c
@@ -25,10 +25,12 @@
 #include "hw.h"
 #include "pci.h"
 #include "pci_host.h"
+#include "pc.h"
 #include "exec-memory.h"
 
 typedef struct PRePPCIState {
     PCIHostState host_state;
+    MemoryRegion intack;
     qemu_irq irq[4];
 } PREPPCIState;
 
@@ -67,6 +69,19 @@ static const MemoryRegionOps PPC_PCIIO_ops = {
     .endianness = DEVICE_LITTLE_ENDIAN,
 };
 
+static uint64_t ppc_intack_read(void *opaque, target_phys_addr_t addr,
+                                unsigned int size)
+{
+    return pic_read_irq(isa_pic);
+}
+
+static const MemoryRegionOps PPC_intack_ops = {
+    .read = ppc_intack_read,
+    .valid = {
+        .max_access_size = 1,
+    },
+};
+
 static int prep_map_irq(PCIDevice *pci_dev, int irq_num)
 {
     return (irq_num + (pci_dev->devfn >> 3)) & 1;
@@ -110,6 +125,8 @@ static int raven_pcihost_init(SysBusDevice *dev)
     memory_region_init_io(&h->mmcfg, &PPC_PCIIO_ops, s, "pciio", 0x00400000);
     memory_region_add_subregion(address_space_mem, 0x80800000, &h->mmcfg);
 
+    memory_region_init_io(&s->intack, &PPC_intack_ops, s, "pci-intack", 1);
+    memory_region_add_subregion(address_space_mem, 0xbffffff0, &s->intack);
     pci_create_simple(bus, 0, "raven");
 
     return 0;