Added the Dell Dimension XPS Pxxx, LG IBM 440FX (MS-6106), and NEC Mate NX MA30D/23D.

src/device/CMakeLists.txt

@@ -21,7 +21,7 @@ add_library(dev OBJECT bugger.c cassette.c cartridge.c hasp.c hwm.c hwm_lm75.c h
     smbus_piix4.c smbus_ali7101.c keyboard.c keyboard_xt.c
     kbc_at.c kbc_at_dev.c
     keyboard_at.c
-    mouse.c mouse_bus.c mouse_serial.c mouse_ps2.c phoenix_486_jumper.c
+    mouse.c mouse_bus.c mouse_serial.c mouse_ps2.c nec_mate_unk.c phoenix_486_jumper.c
     serial_passthrough.c)
 
 if(NOT CMAKE_CXX_COMPILER_ID MATCHES "Clang")

src/device/nec_mate_unk.c

@@ -0,0 +1,76 @@
+/*
+ * 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 NEC Mate NX MA30D/23D Unknown Readout.
+ *
+ *
+ *
+ * Authors: Miran Grca, <mgrca8@gmail.com>
+ *
+ *          Copyright 2020-2023 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/chipset.h>
+#include <86box/plat_unused.h>
+
+    if ((port == 0x6b) || (port == 0x3d6d))
+        ret = 0x2a;
+
+static uint8_t
+nec_mate_unk_read(UNUSED(uint16_t addr), void *priv)
+{
+    /* Expected by this NEC machine.
+
+       It writes something on ports 3D6C, 3D6D, and 3D6E, then expects to read
+       2Ah from port 3D6D. Then it repeats this with ports 6A, 6B, and 6C.
+     */
+    return 0x2a;
+}
+
+static void
+nec_mate_unk_close(void *priv)
+{
+    free(dev);
+}
+
+static void *
+nec_mate_unk_init(const device_t *info)
+{
+    /* We have to return something non-NULL. */
+    uint8_t *dev = (uint8_t *) calloc(1, sizeof(uint8_t));
+
+    io_sethandler(0x006b, 0x0001, nec_mate_unk_read, NULL, NULL, NULL, NULL, NULL, NULL);
+    io_sethandler(0x3d6d, 0x0001, nec_mate_unk_read, NULL, NULL, NULL, NULL, NULL, NULL);
+
+    return dev;
+}
+
+const device_t nec_mate_unk_device = {
+    .name          = "NEC Mate NX MA30D/23D Unknown Readout",
+    .internal_name = "nec_mate_unk_jumper",
+    .flags         = 0,
+    .local         = 0,
+    .init          = nec_mate_unk_jumper_init,
+    .close         = nec_mate_unk_jumper_close,
+    .reset         = nec_mate_unk_jumper_reset,
+    { .available = NULL },
+    .speed_changed = NULL,
+    .force_redraw  = NULL,
+    .config        = NULL
+};