Add the Epson ActionTower 8400.

src/include/86box/machine.h

@@ -539,6 +539,7 @@ extern int machine_at_ecs486_init(const machine_t *);
 extern int machine_at_hot433_init(const machine_t *);
 extern int machine_at_atc1415_init(const machine_t *);
 extern int machine_at_actionpc2600_init(const machine_t *);
+extern int machine_at_actiontower8400_init(const machine_t *);
 extern int machine_at_m919_init(const machine_t *);
 extern int machine_at_spc7700plw_init(const machine_t *);
 extern int machine_at_ms4134_init(const machine_t *);

src/machine/m_at_386dx_486.c

@@ -1874,6 +1874,37 @@ machine_at_actionpc2600_init(const machine_t *model)
     return ret;
 }
 
+int
+machine_at_actiontower8400_init(const machine_t *model)
+{
+    int ret;
+
+    ret = bios_load_linear("roms/machines/actiontower8400/V31C.ROM",
+                           0x000e0000, 131072, 0);
+
+    if (bios_only || !ret)
+        return ret;
+    machine_at_common_init(model);
+
+    pci_init(PCI_CONFIG_TYPE_1);
+    pci_register_slot(0x10, PCI_CARD_NORTHBRIDGE, 0, 0, 0, 0);
+    pci_register_slot(0x12, PCI_CARD_SOUTHBRIDGE, 1, 2, 3, 4);
+    if (gfxcard[0] == VID_INTERNAL)
+        pci_register_slot(0x15, PCI_CARD_VIDEO,   0, 0, 0, 0);
+    pci_register_slot(0x13, PCI_CARD_NORMAL,      1, 2, 3, 4);
+    pci_register_slot(0x14, PCI_CARD_NORMAL,      2, 3, 4, 1);
+
+    device_add(&umc_hb4_device);
+    device_add(&umc_8886af_device);
+    device_add(&fdc37c665_device);
+    device_add(&intel_flash_bxt_device); // The ActionPC 2600 has this so I'm gonna assume this does too.
+    device_add(&keyboard_ps2_ami_pci_device);
+    if (gfxcard[0] == VID_INTERNAL)
+        device_add(&gd5430_pci_device); // VBIOS not included in BIOS ROM
+
+    return ret;
+}
+
 int
 machine_at_m919_init(const machine_t *model)
 {

src/machine/machine_table.c

@@ -7480,6 +7480,46 @@ const machine_t machines[] = {
         .snd_device = NULL,
         .net_device = NULL
     },
+    /* This has the UMC 88xx on-chip KBC. All the copies of the BIOS string I can find, end in
+       in -H, so the UMC on-chip KBC likely emulates the AMI 'H' KBC firmware. */
+    {
+        .name = "[UMC 8881] Epson ActionTower 8400",
+        .internal_name = "actiontower8400",
+        .type = MACHINE_TYPE_486_S3,
+        .chipset = MACHINE_CHIPSET_UMC_UM8881,
+        .init = machine_at_actiontower8400_init,
+        .pad = 0,
+        .pad0 = 0,
+        .pad1 = MACHINE_AVAILABLE,
+        .pad2 = 0,
+        .cpu = {
+            .package = CPU_PKG_SOCKET3,
+            .block = CPU_BLOCK_NONE,
+            .min_bus = 0,
+            .max_bus = 0,
+            .min_voltage = 0,
+            .max_voltage = 0,
+            .min_multi = 0,
+            .max_multi = 0
+        },
+        .bus_flags = MACHINE_PS2_PCI,
+        .flags = MACHINE_SUPER_IO | MACHINE_IDE_DUAL | MACHINE_APM | MACHINE_VIDEO,
+        .ram = {
+            .min = 1024,
+            .max = 262144,
+            .step = 1024
+        },
+        .nvrmask = 255,
+        .kbc_device = NULL,
+        .kbc_p1 = 0,
+        .gpio = 0,
+        .device = NULL,
+        .fdc_device = NULL,
+        .sio_device = NULL,
+        .vid_device = NULL,
+        .snd_device = NULL,
+        .net_device = NULL
+    },
     /* This has the UMC 88xx on-chip KBC. All the copies of the BIOS string I can find, end in
        in -H, so the UMC on-chip KBC likely emulates the AMI 'H' KBC firmware. */
     {