add machine Multitech PC-500 with BIOS ROM v3.10 and v3.30

src/include/86box/machine.h

@@ -1319,6 +1319,10 @@ extern const device_t  jukopc_device;
 extern int             machine_xt_jukopc_init(const machine_t *);
 extern int             machine_xt_kaypropc_init(const machine_t *);
 extern int             machine_xt_micoms_xl7turbo_init(const machine_t *);
+#ifdef EMU_DEVICE_H
+extern const device_t  pc500_device;
+#endif
+extern int             machine_xt_pc500_init(const machine_t *);
 extern int             machine_xt_pc500plus_init(const machine_t *);
 extern int             machine_xt_pc700_init(const machine_t *);
 extern int             machine_xt_pc4i_init(const machine_t *);

src/machine/m_xt.c

@@ -974,6 +974,81 @@ machine_xt_micoms_xl7turbo_init(const machine_t *model)
     return ret;
 }
 
+static const device_config_t pc500_config[] = {
+    // clang-format off
+    {
+        .name       = "bios",
+        .description    = "BIOS Version",
+        .type           = CONFIG_BIOS,
+        .default_string = "pc500_330",
+        .default_int    = 0,
+        .file_filter    = NULL,
+        .spinner        = { 0 },
+        .bios           = {
+            {
+                .name          = "3.30",
+                .internal_name = "pc500_330",
+                .bios_type     = BIOS_NORMAL,
+                .files_no      = 1,
+                .local         = 0,
+                .size          = 8192,
+                .files         = { "roms/machines/pc500/rom330.bin", "" }
+            },
+            {
+                .name          = "3.10",
+                .internal_name = "pc500_310",
+                .bios_type     = BIOS_NORMAL,
+                .files_no      = 1,
+                .local         = 0,
+                .size          = 8192,
+                .files         = { "roms/machines/pc500/rom310.bin", "" }
+            },
+            { .files_no = 0 }
+        },
+    },
+    { .name = "", .description = "", .type = CONFIG_END }
+    // clang-format on
+};
+
+const device_t pc500_device = {
+    .name          = "Multitech PC-500",
+    .internal_name = "pc500_device",
+    .flags         = 0,
+    .local         = 0,
+    .init          = NULL,
+    .close         = NULL,
+    .reset         = NULL,
+    .available     = NULL,
+    .speed_changed = NULL,
+    .force_redraw  = NULL,
+    .config        = pc500_config
+};
+
+int
+machine_xt_pc500_init(const machine_t *model)
+{
+    int         ret = 0;
+    const char *fn;
+
+    /* No ROMs available. */
+    if (!device_available(model->device))
+        return ret;
+
+    device_context(model->device);
+    fn           = device_get_bios_file(model->device, device_get_config_bios("bios"), 0);
+    ret          = bios_load_linear(fn, 0x000fe000, 8192, 0);
+    device_context_restore();
+
+    if (bios_only || !ret)
+        return ret;
+
+    device_add(&kbc_pc_device);
+
+    machine_xt_common_init(model, 0);
+
+    return ret;
+}
+
 int
 machine_xt_pc500plus_init(const machine_t *model)
 {

src/machine/machine_table.c

@@ -1094,6 +1094,49 @@ const machine_t machines[] = {
         .snd_device = NULL,
         .net_device = NULL
     },
+    {
+        .name = "[8088] Multitech PC-500",
+        .internal_name = "pc500",
+        .type = MACHINE_TYPE_8088,
+        .chipset = MACHINE_CHIPSET_DISCRETE,
+        .init = machine_xt_pc500_init,
+        .p1_handler = NULL,
+        .gpio_handler = NULL,
+        .available_flag = MACHINE_AVAILABLE,
+        .gpio_acpi_handler = NULL,
+        .cpu = {
+            .package = CPU_PKG_8088,
+            .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_PC,
+        .flags = MACHINE_FLAGS_NONE,
+        .ram = {
+            .min = 128,
+            .max = 640,
+            .step = 64
+        },
+        .nvrmask = 0,
+        .jumpered_ecp_dma = 0,
+        .default_jumpered_ecp_dma = -1,
+        .kbc_device = &kbc_pc_device,
+        .kbc_params = 0x00000000,
+        .kbc_p1 = 0xff,
+        .gpio = 0xffffffff,
+        .gpio_acpi = 0xffffffff,
+        .device = &pc500_device,
+        .kbd_device = &keyboard_pc_xt_device,
+        .fdc_device = NULL,
+        .sio_device = NULL,
+        .vid_device = NULL,
+        .snd_device = NULL,
+        .net_device = NULL
+    },
     {
         .name = "[8088] Multitech PC-500 plus",
         .internal_name = "pc500plus",