diff --git a/hw/pc98.c b/hw/pc98.c
new file mode 100644
index 0000000..4bc4805
--- /dev/null
+++ b/hw/pc98.c
@@ -0,0 +1,317 @@
+/*
+ * QEMU NEC PC-9821 System Emulator
+ *
+ * Copyright (c) 2009 TAKEDA, toshiya
+ *
+ * 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.h"
+#include "pc.h"
+#include "fdc.h"
+#include "pci.h"
+#include "block.h"
+#include "sysemu.h"
+#include "audio/audio.h"
+#include "audiodev.h"
+#include "net.h"
+#include "boards.h"
+#include "monitor.h"
+#include "ide.h"
+
+static void *sys;
+
+#define MAX_IDE_BUS 2
+
+typedef struct isa_irq_state {
+    qemu_irq *i8259;
+    qemu_irq *ioapic;
+} IsaIrqState;
+
+/* IRQ handling */
+static void isa_irq_handler(void *opaque, int n, int level)
+{
+    IsaIrqState *isa = (IsaIrqState *)opaque;
+
+    if (n < 16) {
+        qemu_set_irq(isa->i8259[n], level);
+    }
+    if (isa->ioapic) {
+        qemu_set_irq(isa->ioapic[n], level);
+    }
+};
+
+static void pic_irq_request(void *opaque, int irq, int level)
+{
+    CPUState *env = first_cpu;
+
+    if (env->apic_state) {
+        while (env) {
+            if (apic_accept_pic_intr(env)) {
+                apic_deliver_pic_intr(env, level);
+            }
+            env = env->next_cpu;
+        }
+    } else {
+        if (level) {
+            cpu_interrupt(env, CPU_INTERRUPT_HARD);
+        } else {
+            cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);
+        }
+    }
+}
+
+#define NE2000_NB_MAX 4
+
+static const int ne2000_io[NE2000_NB_MAX] = { 0x00d0, 0x10d0, 0x20d0, 0x30d0 };
+static const int ne2000_irq[NE2000_NB_MAX] = { 3, 5, 6, 12 };
+
+static void pc98_init_ne2k_isa(NICInfo *nd)
+{
+    static int nb_ne2k = 0;
+
+    if (nb_ne2k == NE2000_NB_MAX) {
+        return;
+    }
+    pc98_ne2000_init(ne2000_io[nb_ne2k], ne2000_irq[nb_ne2k], nd);
+    nb_ne2k++;
+}
+
+static CPUState *pc_new_cpu(const char *cpu_model)
+{
+    CPUState *env;
+
+    env = cpu_init(cpu_model);
+    if (!env) {
+        fprintf(stderr, "Unable to find x86 CPU definition\n");
+        exit(1);
+    }
+    if ((env->cpuid_features & CPUID_APIC) || smp_cpus > 1) {
+        env->cpuid_apic_id = env->cpu_index;
+        /* APIC reset callback resets cpu */
+        apic_init(env);
+    } else {
+        qemu_register_reset((QEMUResetHandler*)cpu_reset, env);
+    }
+    return env;
+}
+
+/* I/O */
+static void ioport_f2_write(void *opaque, uint32_t addr, uint32_t data)
+{
+    ioport_set_a20(1);
+}
+
+static uint32_t ioport_f2_read(void *opaque, uint32_t addr)
+{
+    return (ioport_get_a20() ^ 1) | 0x2e;
+}
+
+static void ioport_f6_write(void *opaque, uint32_t addr, uint32_t data)
+{
+    switch (data) {
+    case 0x02:
+        ioport_set_a20(1);
+        break;
+    case 0x03:
+        ioport_set_a20(0);
+        break;
+    }
+}
+
+static uint32_t ioport_f6_read(void *opaque, uint32_t addr)
+{
+    return (ioport_get_a20() ^ 1) | 0x5e;
+}
+
+static uint32_t ioport_534_read(void *opaque, uint32_t addr)
+{
+    return 0xec; /* cpu mode */
+}
+
+static uint32_t ioport_9894_read(void *opaque, uint32_t addr)
+{
+    return 0x90; /* cpu wait */
+}
+
+void pc98_cpu_shutdown(void)
+{
+    if (pc98_sys_read_shut(sys)) {
+        qemu_system_reset_request();
+    } else {
+        qemu_cpu_reset_request();
+    }
+}
+
+/* PC-9821 hardware initialisation */
+static void pc98_init1(ram_addr_t ram_size,
+                       const char *cpu_model,
+                       int pci_enabled)
+{
+    char cpu_model_opt[64];
+    PCIBus *pci_bus;
+    int piix3_devfn = -1;
+    CPUState *env = NULL;
+    qemu_irq *cpu_irq;
+    qemu_irq *isa_irq;
+    qemu_irq *i8259;
+    IsaIrqState *isa_irq_state;
+    PITState *pit;
+    DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
+    DriveInfo *fd[MAX_FD];
+    int i;
+    uint8_t hd_connect = 0;
+
+    i440fx_state = NULL;
+
+    /* init CPUs */
+    if (cpu_model == NULL) {
+#ifdef TARGET_X86_64
+        cpu_model = "qemu64";
+#else
+        cpu_model = "qemu32";
+#endif
+    }
+    sprintf(cpu_model_opt, "%s,+pc98_a20mask", cpu_model);
+
+    for (i = 0; i < smp_cpus; i++) {
+        env = pc_new_cpu(cpu_model_opt);
+    }
+
+    /* init drives */
+    if (drive_get_max_bus(IF_IDE) >= MAX_IDE_BUS) {
+        fprintf(stderr, "qemu: too many IDE bus\n");
+        exit(1);
+    }
+    for(i = 0; i < MAX_IDE_BUS * MAX_IDE_DEVS; i++) {
+        hd[i] = drive_get(IF_IDE, i / MAX_IDE_DEVS, i % MAX_IDE_DEVS);
+        if (hd[i]) {
+            hd_connect |= (1 << i);
+        }
+    }
+    for(i = 0; i < MAX_FD; i++) {
+        fd[i] = drive_get(IF_FLOPPY, 0, i);
+    }
+
+    /* init basic PC-9821 hardware */
+    cpu_irq = qemu_allocate_irqs(pic_irq_request, NULL, 1);
+    i8259 = pc98_i8259_init(cpu_irq[0]);
+    isa_irq_state = qemu_mallocz(sizeof(*isa_irq_state));
+    isa_irq_state->i8259 = i8259;
+    isa_irq = qemu_allocate_irqs(isa_irq_handler, isa_irq_state, 24);
+
+    if (pci_enabled) {
+        pci_bus = i440fx_init(&i440fx_state, &piix3_devfn, isa_irq);
+    } else {
+        pci_bus = NULL;
+        isa_bus_new(NULL);
+    }
+    isa_bus_irqs(isa_irq);
+
+    ferr_irq = isa_reserve_irq(8);
+
+    if (pci_enabled) {
+        isa_irq_state->ioapic = ioapic_init();
+    }
+    pit = pc98_pit_init(isa_reserve_irq(0));
+    pc98_pcspk_init(pit);
+#ifdef HAS_AUDIO
+    pcspk_audio_init(isa_irq);
+#endif
+    pc98_DMA_init(1);
+
+    pc98_kbd_init();
+    pc98_mouse_init();
+    sys = pc98_sys_init();
+    pc98_vga_init();
+    pc98_memory_init(ram_size, hd_connect);
+
+    pc98_ide_init(hd);
+    pc98_fdctrl_init(fd);
+
+    for(i = 0; i < nb_nics; i++) {
+        NICInfo *nd = &nd_table[i];
+
+        if (!pci_enabled || (nd->model && strcmp(nd->model, "ne2k_isa") == 0)) {
+            pc98_init_ne2k_isa(nd); /* MELCO LGY-98 */
+        } else {
+            pci_nic_init(nd, "ne2k_pci", NULL);
+        }
+    }
+
+//    if (pci_enabled && usb_enabled) {
+//        usb_uhci_piix3_init(pci_bus, piix3_devfn + 2);
+//    }
+
+    if (pci_enabled && acpi_enabled) {
+        piix4_acpi_system_hot_add_init(pci_bus);
+    }
+
+    if (i440fx_state) {
+        i440fx_init_memory_mappings(i440fx_state);
+    }
+    
+    register_ioport_write(0xf2, 1, 1, ioport_f2_write, env);
+    register_ioport_read(0xf2, 1, 1, ioport_f2_read, env);
+    register_ioport_write(0xf6, 1, 1, ioport_f6_write, env);
+    register_ioport_read(0xf6, 1, 1, ioport_f6_read, env);
+    register_ioport_read(0x534, 1, 1, ioport_534_read, env);
+    register_ioport_read(0x9894, 1, 1, ioport_9894_read, env);
+}
+
+static void pc98_init_pci(ram_addr_t ram_size,
+                          const char *boot_device,
+                          const char *kernel_filename,
+                          const char *kernel_cmdline,
+                          const char *initrd_filename,
+                          const char *cpu_model)
+{
+    pc98_init1(ram_size, cpu_model, 1);
+}
+
+static void pc98_init_isa(ram_addr_t ram_size,
+                          const char *boot_device,
+                          const char *kernel_filename,
+                          const char *kernel_cmdline,
+                          const char *initrd_filename,
+                          const char *cpu_model)
+{
+    pc98_init1(ram_size, cpu_model, 0);
+}
+
+static QEMUMachine pc98pci_machine = {
+    .name = "pc98pci",
+    .desc = "NEC PC-9821 with PCI",
+    .init = pc98_init_pci,
+    .max_cpus = 2,
+};
+
+static QEMUMachine pc98_machine = {
+    .name = "pc98",
+    .desc = "NEC PC-9821",
+    .init = pc98_init_isa,
+    .max_cpus = 1,
+};
+
+static void pc98_machine_init(void)
+{
+    qemu_register_machine(&pc98pci_machine);
+    qemu_register_machine(&pc98_machine);
+}
+
+machine_init(pc98_machine_init);
diff --git a/hw/pc98.h b/hw/pc98.h
new file mode 100644
index 0000000..6dceeef
--- /dev/null
+++ b/hw/pc98.h
@@ -0,0 +1,65 @@
+#ifndef HW_PC98_H
+#define HW_PC98_H
+
+#define PC98_SYSCLOCK_5MHZ
+//#define PC98_SYSCLOCK_8MHZ
+
+#ifdef PC98_SYSCLOCK_5MHZ
+    #define PC98_PIT_FREQ 2457600
+#else
+    #define PC98_PIT_FREQ 1996800
+#endif
+
+#define PC98_DONT_USE_16MB_MEM
+
+#define PC98_CIRRUS_VRAM_SIZE 0x100000
+
+/* pc98.c */
+void pc98_cpu_shutdown(void);
+
+/* pc98bkd.c */
+void pc98_kbd_init(void);
+
+/* pc98mouse.c */
+void pc98_mouse_init(void);
+
+/* pc98sys.c */
+void *pc98_sys_init(void);
+uint8_t pc98_sys_read_shut(void *opaque);
+
+/* pc98vga.c */
+void pc98_vga_init(void);
+
+/* pc98mem.c */
+void pc98_memory_init(ram_addr_t ram_size, uint8_t hd_connect);
+
+/* cirrus_vga.c */
+void *pc98_cirrus_vga_init(DisplayState *ds);
+void pc98_cirrus_vga_invalidate_display_size(void *opaque);
+void pc98_cirrus_vga_update_display(void *opaque);
+void pc98_cirrus_vga_invalidate_display(void *opaque);
+
+uint32_t pc98_cirrus_vram_readb(void *opaque, target_phys_addr_t addr);
+uint32_t pc98_cirrus_vram_readw(void *opaque, target_phys_addr_t addr);
+uint32_t pc98_cirrus_vram_readl(void *opaque, target_phys_addr_t addr);
+void pc98_cirrus_vram_writeb(void *opaque,
+                             target_phys_addr_t addr, uint32_t value);
+void pc98_cirrus_vram_writew(void *opaque,
+                             target_phys_addr_t addr, uint32_t value);
+void pc98_cirrus_vram_writel(void *opaque,
+                             target_phys_addr_t addr, uint32_t value);
+
+/* i8254.c */
+PITState *pc98_pit_init(qemu_irq irq);
+
+/* i8259.c */
+qemu_irq *pc98_i8259_init(qemu_irq parent_irq);
+
+/* pcspk.c */
+void pc98_pcspk_init(PITState *);
+void pc98_pcspk_write(uint32_t val);
+
+/* ne2000.c */
+void pc98_ne2000_init(int base, int irq, NICInfo *nd);
+
+#endif
