From a042925efe3e3918b760b0c6a82509af74eeb790 Mon Sep 17 00:00:00 2001
From: OBattler <oubattler@gmail.com>
Date: Mon, 9 Jun 2025 18:30:50 +0200
Subject: [PATCH] Tulip jumper device.

---
 src/device/CMakeLists.txt   |   1 +
 src/device/tulip_jumper.c   | 103 ++++++++++++++++++++++++++++++++++++
 src/include/86box/chipset.h |   2 +
 3 files changed, 106 insertions(+)
 create mode 100644 src/device/tulip_jumper.c

diff --git a/src/device/CMakeLists.txt b/src/device/CMakeLists.txt
index ea89f5cd9..29fc0b9b4 100644
--- a/src/device/CMakeLists.txt
+++ b/src/device/CMakeLists.txt
@@ -57,6 +57,7 @@ add_library(dev OBJECT
     smbus_ali7101.c
     smbus_piix4.c
     smbus_sis5595.c
+    tulip_jumper.c
     unittester.c
 )
 
diff --git a/src/device/tulip_jumper.c b/src/device/tulip_jumper.c
new file mode 100644
index 000000000..1974129e3
--- /dev/null
+++ b/src/device/tulip_jumper.c
@@ -0,0 +1,103 @@
+/*
+ * 86Box    A hypervisor and IBM PC system emulator that specializes in
+ *          running old operating systems and software designed for IBM
+ *          PC systems and compatibles from 1981 through fairly recent
+ *          system designs based on the PCI bus.
+ *
+ *          This file is part of the 86Box distribution.
+ *
+ *          Implementation of the Tulip Jumper Readout.
+ *
+ *          Bits 7-5 = board number, 0-5 valid, 6, 7 invalid.
+ *
+ * Authors: Miran Grca, <mgrca8@gmail.com>
+ *
+ *          Copyright 2025 Miran Grca.
+ */
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wchar.h>
+#define HAVE_STDARG_H
+#include <86box/86box.h>
+#include "cpu.h"
+#include <86box/timer.h>
+#include <86box/io.h>
+#include <86box/device.h>
+#include <86box/machine.h>
+#include <86box/sound.h>
+#include <86box/chipset.h>
+#include <86box/plat.h>
+#include <86box/plat_unused.h>
+
+typedef struct tulip_jumper_t {
+    uint8_t jumper;
+} tulip_jumper_t;
+
+#ifdef ENABLE_TULIP_JUMPER_LOG
+int tulip_jumper_do_log = ENABLE_TULIP_JUMPER_LOG;
+
+static void
+tulip_jumper_log(const char *fmt, ...)
+{
+    va_list ap;
+
+    if (tulip_jumper_do_log) {
+        va_start(ap, fmt);
+        pclog_ex(fmt, ap);
+        va_end(ap);
+    }
+}
+#else
+#    define tulip_jumper_log(fmt, ...)
+#endif
+
+static uint8_t
+tulip_jumper_read(uint16_t addr, void *priv)
+{
+    const tulip_jumper_t *dev = (tulip_jumper_t *) priv;
+    uint8_t               ret = 0xff;
+
+    tulip_jumper_log("Tulip Jumper: Read %02x\n", dev->jumper);
+
+    ret = dev->jumper;
+
+    return ret;
+}
+
+static void
+tulip_jumper_close(void *priv)
+{
+    tulip_jumper_t *dev = (tulip_jumper_t *) priv;
+
+    free(dev);
+}
+
+static void *
+tulip_jumper_init(const device_t *info)
+{
+    tulip_jumper_t *dev = (tulip_jumper_t *) calloc(1, sizeof(tulip_jumper_t));
+
+    /* Return board number 05. */
+    dev->jumper = 0xbf;
+
+    io_sethandler(0x0d80, 0x0001, tulip_jumper_read, NULL, NULL, NULL, NULL, NULL, dev);
+
+    return dev;
+}
+
+const device_t tulip_jumper_device = {
+    .name          = "Tulip Jumper Readout",
+    .internal_name = "tulip_jumper",
+    .flags         = 0,
+    .local         = 0,
+    .init          = tulip_jumper_init,
+    .close         = tulip_jumper_close,
+    .reset         = NULL,
+    .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 e0e775fa1..1b5684414 100644
--- a/src/include/86box/chipset.h
+++ b/src/include/86box/chipset.h
@@ -201,6 +201,8 @@ extern const device_t vlsi_scamp_device;
 extern const device_t wd76c10_device;
 
 /* Miscellaneous Hardware */
+extern const device_t tulip_jumper_device;
+
 extern const device_t dell_jumper_device;
 
 extern const device_t nec_mate_unk_device;