Added the Sanyo MBC-17, Sharp AX 286, ECS Socket 4 machine, LG Multinet x52, and Taken Socket 4/5 machine, also IDE PIO mode 3+ fixes, and ATA-3 IDE drives now default to PIO mode 3 maximum instead of 0.

src/chipset/CMakeLists.txt

@@ -60,6 +60,7 @@ add_library(chipset OBJECT
     opti895.c
     opti5x7.c
     philips.c
+    sanyo.c
     scamp.c
     scat.c
     sis_85c310.c

src/chipset/sanyo.c

@@ -0,0 +1,123 @@
+/*
+ * 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.
+ *
+ *          Emulation of the Philips XT-compatible machines.
+ *
+ * Authors: EngiNerd <webmaster.crrc@yahoo.it>
+ *
+ *          Copyright 2020-2025 EngiNerd.
+ */
+#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 <86box/nmi.h>
+#include "cpu.h"
+#include <86box/timer.h>
+#include <86box/pit.h>
+#include <86box/mem.h>
+#include <86box/device.h>
+#include <86box/fdd.h>
+#include <86box/fdc.h>
+#include <86box/fdc_ext.h>
+#include <86box/hdc.h>
+#include <86box/gameport.h>
+#include <86box/ibm_5161.h>
+#include <86box/keyboard.h>
+#include <86box/rom.h>
+#include <86box/machine.h>
+#include <86box/chipset.h>
+#include <86box/io.h>
+#include <86box/video.h>
+#include <86box/plat_unused.h>
+
+typedef struct sanyo_t {
+    uint8_t reg;
+} sanyo_t;
+
+#ifdef ENABLE_SANYO_LOG
+int sanyo_do_log = ENABLE_SANYO_LOG;
+
+static void
+sanyo_log(const char *fmt, ...)
+{
+    va_list ap;
+
+    if (sanyo_do_log) {
+        va_start(ap, fmt);
+        pclog_ex(fmt, ap);
+        va_end(ap);
+    }
+}
+#else
+#    define sanyo_log(fmt, ...)
+#endif
+
+static void
+sanyo_write(uint16_t port, uint8_t val, void *priv)
+{
+    sanyo_t *dev = (sanyo_t *) priv;
+
+    dev->reg = val;
+
+    cpu_waitstates = !(val & 0x01);
+    cpu_update_waitstates();
+
+    sanyo_log("Sanyo MBC-17 Mainboard: Write %02x at %02x\n", val, port);
+}
+
+static uint8_t
+sanyo_read(uint16_t port, void *priv)
+{
+    const sanyo_t *dev = (sanyo_t *) priv;
+    uint8_t        ret = 0xff;
+
+    ret = dev->reg;
+
+    sanyo_log("Sanyo MBC-17 Mainboard: Read %02x at %02x\n", ret, port);
+
+    return ret;
+}
+
+static void
+sanyo_close(void *priv)
+{
+    sanyo_t *dev = (sanyo_t *) priv;
+
+    free(dev);
+}
+
+static void *
+sanyo_init(UNUSED(const device_t *info))
+{
+    sanyo_t *dev = (sanyo_t *) calloc(1, sizeof(sanyo_t));
+
+    dev->reg = cpu_waitstates ? 0x00 : 0x01;
+
+    io_sethandler(0x0063, 0x01, sanyo_read, NULL, NULL, sanyo_write, NULL, NULL, dev);
+
+    return dev;
+}
+
+const device_t sanyo_device = {
+    .name          = "Sanyo MBC-17 Mainboard",
+    .internal_name = "sanyo",
+    .flags         = 0,
+    .local         = 0,
+    .init          = sanyo_init,
+    .close         = sanyo_close,
+    .reset         = NULL,
+    .available     = NULL,
+    .speed_changed = NULL,
+    .force_redraw  = NULL,
+    .config        = NULL
+};