From 462e9232b3633ac54e4abf2935cce95ae8426d53 Mon Sep 17 00:00:00 2001
From: OBattler <oubattler@gmail.com>
Date: Sat, 10 May 2025 05:05:56 +0200
Subject: [PATCH] Chaintech 5SBM2: Rename to 5SBM/5SBM2 and add the 4.50PG BIOS
 from 1996 as an option.

---
 src/machine/m_at_socket7_3v.c | 49 ++++++++++++++++++++++++++++++++---
 src/machine/machine_table.c   |  7 ++---
 2 files changed, 50 insertions(+), 6 deletions(-)

diff --git a/src/machine/m_at_socket7_3v.c b/src/machine/m_at_socket7_3v.c
index 913c82518..04bc6b5ef 100644
--- a/src/machine/m_at_socket7_3v.c
+++ b/src/machine/m_at_socket7_3v.c
@@ -825,13 +825,56 @@ machine_at_vectra54_init(const machine_t *model)
     return ret;
 }
 
+static const device_config_t c5sbm2_config[] = {
+    // clang-format off
+    {
+        .name = "bios",
+        .description = "BIOS Version",
+        .type = CONFIG_BIOS,
+        .default_string = "5sbm2",
+        .default_int = 0,
+        .file_filter = "",
+        .spinner = { 0 },
+        .bios = {
+            { .name = "4.50GP (07/17/1995)", .internal_name = "5sbm2", .bios_type = BIOS_NORMAL, 
+              .files_no = 1, .local = 0, .size = 131072, .files = { "roms/machines/5sbm2/5SBM0717.BIN", "" } },
+            { .name = "4.50PG (03/21/1996)", .internal_name = "5sbm2_450pg", .bios_type = BIOS_NORMAL,
+              .files_no = 1, .local = 0, .size = 131072, .files = { "roms/machines/5sbm2/5SBM0326.BIN", "" } },
+            { .files_no = 0 }
+        },
+    },
+    { .name = "", .description = "", .type = CONFIG_END }
+    // clang-format on
+};
+
+const device_t c5sbm2_device = {
+    .name          = "Chaintech 5SBM/5SBM2 (M103)",
+    .internal_name = "5sbm2_device",
+    .flags         = 0,
+    .local         = 0,
+    .init          = NULL,
+    .close         = NULL,
+    .reset         = NULL,
+    .available     = NULL,
+    .speed_changed = NULL,
+    .force_redraw  = NULL,
+    .config        = c5sbm2_config
+};
+
 int
 machine_at_5sbm2_init(const machine_t *model)
 {
-    int ret;
+    int ret = 0;
+    const char* fn;
 
-    ret = bios_load_linear("roms/machines/5sbm2/5SBM0717.BIN",
-                           0x000e0000, 131072, 0);
+    /* No ROMs available */
+    if (!device_available(model->device))
+        return ret;
+
+    device_context(model->device);
+    fn = device_get_bios_file(machine_get_device(machine), device_get_config_bios("bios"), 0);
+    ret = bios_load_linear(fn, 0x000e0000, 131072, 0);
+    device_context_restore();
 
     if (bios_only || !ret)
         return ret;
diff --git a/src/machine/machine_table.c b/src/machine/machine_table.c
index e0317f40f..34e69ed24 100644
--- a/src/machine/machine_table.c
+++ b/src/machine/machine_table.c
@@ -68,6 +68,7 @@ extern const device_t ibmxt286_device;
 extern const device_t pb450_device;
 extern const device_t jukopc_device;
 extern const device_t vendex_device;
+extern const device_t c5sbm2_device;
 
 const machine_filter_t machine_types[] = {
     { "None",                             MACHINE_TYPE_NONE       },
@@ -11545,7 +11546,7 @@ const machine_t machines[] = {
     /* SiS 5501 */
     /* Has the Lance LT38C41 KBC. */
     {
-        .name = "[SiS 5501] Chaintech 5SBM2 (M103)",
+        .name = "[SiS 5501] Chaintech 5SBM/5SBM2 (M103)",
         .internal_name = "5sbm2",
         .type = MACHINE_TYPE_SOCKET7_3V,
         .chipset = MACHINE_CHIPSET_SIS_5501,
@@ -11568,7 +11569,7 @@ const machine_t machines[] = {
         .flags = MACHINE_IDE_DUAL | MACHINE_APM,
         .ram = {
             .min = 8192,
-            .max = 262144,
+            .max = 131072,
             .step = 8192
         },
         .nvrmask = 255,
@@ -11576,7 +11577,7 @@ const machine_t machines[] = {
         .kbc_p1 = 0xff,
         .gpio = 0xffffffff,
         .gpio_acpi = 0xffffffff,
-        .device = NULL,
+        .device = &c5sbm2_device,
         .fdc_device = NULL,
         .sio_device = NULL,
         .vid_device = NULL,