From 4ea89bb216755b65595f635eecf55d386937f0f9 Mon Sep 17 00:00:00 2001
From: win2kgamer <47463859+win2kgamer@users.noreply.github.com>
Date: Sun, 15 Feb 2026 00:58:03 -0600
Subject: [PATCH] Intel Monsoon: Give the machine a version of the Phoenix
 jumper device, fixes onboard video

---
 src/device/phoenix_486_jumper.c | 31 ++++++++++++++++++++++++++++++-
 src/include/86box/chipset.h     |  1 +
 src/machine/m_at_socket2.c      |  1 +
 3 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/src/device/phoenix_486_jumper.c b/src/device/phoenix_486_jumper.c
index ed4349082..905af1149 100644
--- a/src/device/phoenix_486_jumper.c
+++ b/src/device/phoenix_486_jumper.c
@@ -52,11 +52,19 @@
     Bit 0 = ????
 */
 
+/*
+    Intel Monsoon bit meanings:
+    Bit 4 = Onboard video: 1 = disabled, 0 = enabled
+    Bit 3 = CMOS Setup enable
+*/
+
 typedef struct phoenix_486_jumper_t {
     uint8_t type;
     uint8_t jumper;
 } phoenix_486_jumper_t;
 
+#define ENABLE_PHOENIX_486_JUMPER_LOG 1
+
 #ifdef ENABLE_PHOENIX_486_JUMPER_LOG
 int phoenix_486_jumper_do_log = ENABLE_PHOENIX_486_JUMPER_LOG;
 
@@ -84,6 +92,8 @@ phoenix_486_jumper_write(UNUSED(uint16_t addr), uint8_t val, void *priv)
         dev->jumper = val & 0xbf;
     else if (dev->type == 2) /* PB600 */
         dev->jumper = ((val & 0xbf) | 0x02);
+    else if (dev->type == 3) /* Intel Monsoon */
+        dev->jumper = val | 0x08;
     else
         dev->jumper = val;
 }
@@ -106,7 +116,11 @@ phoenix_486_jumper_reset(void *priv)
         dev->jumper = 0x00;
     else if (dev->type == 2) /* PB600 */
         dev->jumper = 0x02;
-    else {
+    else if (dev->type == 3) { /* Intel Monsoon */
+        dev->jumper = 0xef;
+        if (gfxcard[0] != 0x01)
+            dev->jumper |= 0x10;
+    } else {
         dev->jumper = 0x9f;
         if (gfxcard[0] != 0x01)
             dev->jumper |= 0x40;
@@ -176,3 +190,18 @@ const device_t phoenix_486_jumper_pci_pb600_device = {
     .force_redraw  = NULL,
     .config        = NULL
 };
+
+const device_t phoenix_486_jumper_monsoon_device = {
+    .name          = "Phoenix 486 Jumper Readout (Monsoon)",
+    .internal_name = "phoenix_486_jumper_monsoon",
+    .flags         = 0,
+    .local         = 3,
+    .init          = phoenix_486_jumper_init,
+    .close         = phoenix_486_jumper_close,
+    .reset         = phoenix_486_jumper_reset,
+    .available     = NULL,
+    .speed_changed = NULL,
+    .force_redraw  = NULL,
+    .config        = NULL
+};
+
diff --git a/src/include/86box/chipset.h b/src/include/86box/chipset.h
index 4ded831bd..6fa7881ca 100644
--- a/src/include/86box/chipset.h
+++ b/src/include/86box/chipset.h
@@ -234,6 +234,7 @@ extern const device_t nec_mate_unk_device;
 extern const device_t phoenix_486_jumper_device;
 extern const device_t phoenix_486_jumper_pci_device;
 extern const device_t phoenix_486_jumper_pci_pb600_device;
+extern const device_t phoenix_486_jumper_monsoon_device;
 
 extern const device_t ast_readout_device;
 extern const device_t ast_nvr_device;
diff --git a/src/machine/m_at_socket2.c b/src/machine/m_at_socket2.c
index 5c4a19f17..5b871d298 100644
--- a/src/machine/m_at_socket2.c
+++ b/src/machine/m_at_socket2.c
@@ -389,6 +389,7 @@ machine_at_monsoon_init(const machine_t *model)
     device_add_params(&fdc37c6xx_device, (void *) (FDC37C651 | FDC37C6XX_IDE_PRI));
 
     device_add(&intel_flash_bxt_device);
+    device_add(&phoenix_486_jumper_monsoon_device);
 
     if (gfxcard[0] == VID_INTERNAL)
         device_add(machine_get_vid_device(machine));