diff --git a/src/disk/hdc_ide.c b/src/disk/hdc_ide.c
index 660093a8e..b868f51a0 100644
--- a/src/disk/hdc_ide.c
+++ b/src/disk/hdc_ide.c
@@ -558,7 +558,10 @@ ide_hd_identify(const ide_t *ide)
     /* Firmware */
     ide_padstr((char *) (ide->buffer + 23), EMU_VERSION_EX, 8);
     /* Model */
-    ide_padstr((char *) (ide->buffer + 27), device_identify, 40);
+    if (hdd[ide->hdd_num].model)
+        ide_padstr((char *) (ide->buffer + 27), hdd[ide->hdd_num].model, 40);
+    else
+        ide_padstr((char *) (ide->buffer + 27), device_identify, 40);
     /* Fixed drive */
     ide->buffer[0]  = (1 << 6);
     /* Buffer type */
diff --git a/src/disk/hdd.c b/src/disk/hdd.c
index 7acfc82be..ea38602d2 100644
--- a/src/disk/hdd.c
+++ b/src/disk/hdd.c
@@ -415,7 +415,10 @@ static hdd_preset_t hdd_speed_presets[] = {
     { .name = "[1997] 5400 RPM",       .internal_name = "1997_5400rpm", .zones = 16, .avg_spt = 185, .heads = 6, .rpm = 5400, .full_stroke_ms = 20, .track_seek_ms = 2.5, .rcache_num_seg =  8, .rcache_seg_size =  64, .max_multiple = 32 },
     { .name = "[1998] 5400 RPM",       .internal_name = "1998_5400rpm", .zones = 16, .avg_spt = 300, .heads = 8, .rpm = 5400, .full_stroke_ms = 20, .track_seek_ms = 2,   .rcache_num_seg =  8, .rcache_seg_size = 128, .max_multiple = 32 },
     { .name = "[2000] 7200 RPM",       .internal_name = "2000_7200rpm", .zones = 16, .avg_spt = 350, .heads = 6, .rpm = 7200, .full_stroke_ms = 15, .track_seek_ms = 2,   .rcache_num_seg = 16, .rcache_seg_size = 128, .max_multiple = 32 },
-  // clang-format on
+    { .name = "Conner CP3024",         .internal_name = "CP3024", .model = "Conner Peripherals 20MB - CP3024", .zones =  1,  .avg_spt = 33, .heads = 2, .rpm = 3500, .full_stroke_ms = 50, .track_seek_ms = 8,   .rcache_num_seg =  1, .rcache_seg_size =  8, .max_multiple =  8 },
+    { .name = "Conner CP3044",         .internal_name = "CP3044", .model = "Conner Peripherals 40MB - CP3044", .zones =  1,  .avg_spt = 40, .heads = 2, .rpm = 3500, .full_stroke_ms = 50, .track_seek_ms = 8,   .rcache_num_seg =  1, .rcache_seg_size =  8, .max_multiple =  8 },
+    { .name = "Conner CP3104",         .internal_name = "CP3104", .model = "Conner Peripherals 104MB - CP3104", .zones =  1,  .avg_spt = 33, .heads = 8, .rpm = 3500, .full_stroke_ms = 45, .track_seek_ms = 8,   .rcache_num_seg =  4, .rcache_seg_size =  8, .max_multiple =  8 },
+    // clang-format on
 };
 
 int
@@ -472,6 +475,8 @@ hdd_preset_apply(int hdd_id)
     hd->cache.num_segments = preset->rcache_num_seg;
     hd->cache.segment_size = preset->rcache_seg_size;
     hd->max_multiple_block = preset->max_multiple;
+    if (preset->model)
+        hd->model = preset->model;
 
     if (!hd->speed_preset)
         return;
diff --git a/src/include/86box/hdd.h b/src/include/86box/hdd.h
index 25c32355e..a4bded58f 100644
--- a/src/include/86box/hdd.h
+++ b/src/include/86box/hdd.h
@@ -90,6 +90,7 @@ enum {
 typedef struct hdd_preset_t {
     const char *name;
     const char *internal_name;
+    const char *model;
     uint32_t    zones;
     uint32_t    avg_spt;
     uint32_t    heads;
@@ -165,6 +166,7 @@ typedef struct hard_disk_t {
     uint32_t spt;
     uint32_t hpc; /* Physical geometry parameters */
     uint32_t tracks;
+    const char *model;
 
     hdd_zone_t  zones[HDD_MAX_ZONES];
     uint32_t    num_zones;
diff --git a/src/include/86box/machine.h b/src/include/86box/machine.h
index 953ee7585..5355fa0be 100644
--- a/src/include/86box/machine.h
+++ b/src/include/86box/machine.h
@@ -848,6 +848,9 @@ extern int machine_at_vpc2007_init(const machine_t *);
 /* m_at_t3100e.c */
 extern int machine_at_t3100e_init(const machine_t *);
 
+/* m_at_grid.c */
+extern int machine_at_grid1520_init(const machine_t *);
+
 /* m_elt.c */
 extern int machine_elt_init(const machine_t *);
 
diff --git a/src/machine/CMakeLists.txt b/src/machine/CMakeLists.txt
index 55e0e0197..ff6a66801 100644
--- a/src/machine/CMakeLists.txt
+++ b/src/machine/CMakeLists.txt
@@ -34,6 +34,7 @@ add_library(mch OBJECT
     m_v86p.c
     m_at.c
     m_at_commodore.c
+    m_at_grid.c
     m_at_t3100e.c
     m_at_t3100e_vid.c
     m_ps1.c
diff --git a/src/machine/m_at_grid.c b/src/machine/m_at_grid.c
new file mode 100644
index 000000000..521641c39
--- /dev/null
+++ b/src/machine/m_at_grid.c
@@ -0,0 +1,365 @@
+/*
+ * 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 GRiD GRiDcase 1520
+ *
+ *          The GRiDcase 1520 is a 286-based portable.
+ * These are HDDs supported by GRiD1520 (and probably other 15XX) BIOS
+ * "CP3022",5
+ * "CP3024",5, 615,4,17 BIOS table type 2
+ * "CP344",6,
+ * "CP3044",9, 980,5,17 BIOS table type 17
+ * "CP3042",9
+ * "CP3104",7, 776,8,33 extended type 224 (separate entry outside BIOS table)
+ * The only way to run unpatched BIOS is to run exactly that (or larger)
+ * geometry and report model name correctly in response to IDENTYIFY command.
+ * Alternatively you can use RomBuster to patch the BIOS.
+ * https://classicbits.net/coding-and-software/my-software/rombuster/
+ */
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <86box/86box.h>
+#include "cpu.h"
+#include <86box/timer.h>
+#include <86box/device.h>
+#include <86box/fdd.h>
+#include <86box/fdc.h>
+#include <86box/fdc_ext.h>
+#include <86box/io.h>
+#include <86box/keyboard.h>
+#include <86box/machine.h>
+#include <86box/mem.h>
+#include <86box/rom.h>
+#include <86box/vid_cga.h>
+
+#define GRID_APPROM_SELECT 0x440
+#define GRID_APPROM_ENABLE 0x405
+
+/*
+approm mapping regs?
+XXX_7FA         equ     7FAh
+XXX_7F8         equ     7F8h
+XXX_7F9         equ     7F9h
+XXX_BD0         equ     0BD0h
+XXX_BD1         equ     0BD1h
+*/
+
+#define GRID_EMS_PAGE_0 0x0258
+#define GRID_EMS_PAGE_1 0x4258
+#define GRID_EMS_PAGE_2 0x8258
+#define GRID_EMS_PAGE_3 0xC258
+#define GRID_TURBO 0x416
+#define GRID_UNUSED_424 0x424
+#define GRID_426 0x426
+#define GRID_HIGH_ENABLE 0xFFF
+#define GRID_ROM_SUBSYSTEM 0x6F8
+
+// EMS window
+#define GRID_EMS_BASE 0xE0000
+#define GRID_EMS_PAGE_SIZE 0x4000
+#define GRID_EMS_PAGE_MASK 0x3FFF
+#define GRID_EMS_PAGE_SHIFT 14
+// physical base of extended memory
+#define GRID_EXTENDED_BASE 0xA0000
+#define GRID_1M 0x100000
+
+typedef struct {
+    uint8_t grid_unknown;
+    uint8_t grid_unused_424;
+    uint8_t grid_426;
+    uint8_t grid_high_enable;
+    uint8_t grid_ems_page[4];
+    mem_mapping_t grid_ems_mapping[4];
+    uint8_t grid_turbo;
+    uint8_t grid_rom_enable;
+    uint8_t grid_rom_select;
+} grid_t;
+
+
+static uint32_t get_grid_ems_paddr(grid_t *dev, uint32_t addr) {
+    uint32_t slot = (addr >> GRID_EMS_PAGE_SHIFT) & 0x3;
+    uint32_t paddr = addr;
+    if (dev->grid_ems_page[slot] & 0x80) {
+        paddr = GRID_EXTENDED_BASE + ((uint32_t)(dev->grid_ems_page[slot] & 0x7F) << GRID_EMS_PAGE_SHIFT) + (addr & GRID_EMS_PAGE_MASK);
+    }
+
+    return paddr;
+}
+
+static void grid_ems_mem_write8(uint32_t addr, uint8_t val, void *priv) {
+    grid_t *dev = (grid_t *)priv;
+    addr = get_grid_ems_paddr(dev, addr);
+    if (addr < (mem_size << 10)) {
+        ram[addr] = val;                
+    }
+}
+
+static uint8_t grid_ems_mem_read8(uint32_t addr, void *priv) {
+    grid_t *dev = (grid_t *)priv;
+    uint8_t val = 0xFF;
+
+    addr = get_grid_ems_paddr(dev, addr);
+    if (addr < (mem_size << 10)) {
+        val = ram[addr];                
+    }
+
+    return val;
+}
+
+static void grid_ems_mem_write16(uint32_t addr, uint16_t val, void *priv) {
+    grid_t *dev = (grid_t *)priv;
+    addr = get_grid_ems_paddr(dev, addr);
+    if (addr < (mem_size << 10)) {
+        *(uint16_t *)&(ram[addr]) = val;                
+    }
+}
+
+static uint16_t grid_ems_mem_read16(uint32_t addr, void *priv) {
+    grid_t *dev = (grid_t *)priv;
+    uint16_t val = 0xFFFF;
+
+    addr = get_grid_ems_paddr(dev, addr);
+    if (addr < (mem_size << 10)) {
+        val = *(uint16_t *)&(ram[addr]);
+    }
+    return val;
+}
+
+static void grid_ems_update_mapping(grid_t *dev, uint32_t slot) {
+    uint32_t vaddr = GRID_EMS_BASE + (slot << GRID_EMS_PAGE_SHIFT);
+    if (dev->grid_ems_page[slot] & 0x80) {
+        uint32_t paddr;
+        mem_mapping_enable(&dev->grid_ems_mapping[slot]);
+        paddr = get_grid_ems_paddr(dev, vaddr);
+        mem_mapping_set_exec(&dev->grid_ems_mapping[slot], ram + paddr);
+    } else {
+        mem_mapping_disable(&dev->grid_ems_mapping[slot]);
+    }
+}
+
+static void grid_io_write(uint16_t port, uint8_t val, void *priv) {
+    grid_t *dev = (grid_t *)priv;
+    int i;
+    uint32_t paddr, vaddr;
+
+    switch (port) {
+        case GRID_426:
+            dev->grid_426 = val;
+            break;
+        case GRID_UNUSED_424:
+            dev->grid_unused_424 = val;
+            break;
+        case GRID_ROM_SUBSYSTEM:
+        case GRID_ROM_SUBSYSTEM+1:
+        case GRID_ROM_SUBSYSTEM+2:
+        case GRID_ROM_SUBSYSTEM+3:
+        case GRID_ROM_SUBSYSTEM+4:
+        case GRID_ROM_SUBSYSTEM+5:
+        case GRID_ROM_SUBSYSTEM+6:
+        case GRID_ROM_SUBSYSTEM+7:
+            break;
+        case GRID_APPROM_SELECT:
+            dev->grid_rom_select = val;
+            break;
+        case GRID_APPROM_ENABLE:
+            dev->grid_rom_enable = val;
+            break;
+        case GRID_TURBO:   
+            if ((dev->grid_turbo ^ val) & 1) {
+                dev->grid_turbo = val;
+                if (dev->grid_turbo) {
+                    cpu_dynamic_switch(cpu);
+                } else {
+                    cpu_dynamic_switch(0); /* 286/6 */        
+                }
+            }
+            break;
+        case GRID_EMS_PAGE_0:
+        case GRID_EMS_PAGE_1:
+        case GRID_EMS_PAGE_2:
+        case GRID_EMS_PAGE_3: {
+            uint32_t slot = (port >> 14) & 0x3;
+            if (dev->grid_ems_page[slot] == val)
+                break; // no change
+
+            dev->grid_ems_page[slot] = val;
+            if (dev->grid_high_enable & 0x1)
+                break; // XMS is enabled
+            grid_ems_update_mapping(dev, slot);
+
+            flushmmucache();
+            break;
+        }
+        case GRID_HIGH_ENABLE: {
+            uint32_t i;
+
+            if (((val ^ dev->grid_high_enable) & 0x1) == 0)
+                break; // no change
+            dev->grid_high_enable = val;
+            if (dev->grid_high_enable & 0x1) {
+                for (i = 0; i < 4; i++) {
+                    mem_mapping_disable(&dev->grid_ems_mapping[i]);
+                }
+                mem_mapping_enable(&ram_high_mapping);                
+            } else {
+                mem_mapping_disable(&ram_high_mapping);
+                for (i = 0; i < 4; i++) {
+                    grid_ems_update_mapping(dev, i);
+                }
+            }
+            flushmmucache();
+            break;
+        }
+        default:
+            ;
+    }
+}
+
+static uint8_t grid_io_read(uint16_t port, void *priv) {
+    grid_t *dev = (grid_t *)priv;
+
+    switch (port) {
+        case GRID_426:
+            return dev->grid_426;
+            break;
+        case GRID_UNUSED_424:
+            return dev->grid_unused_424;
+            break;
+        case GRID_ROM_SUBSYSTEM:
+            return 0x99;
+            break;
+        case GRID_ROM_SUBSYSTEM+1:
+        case GRID_ROM_SUBSYSTEM+2:
+        case GRID_ROM_SUBSYSTEM+3:
+        case GRID_ROM_SUBSYSTEM+4:
+        case GRID_ROM_SUBSYSTEM+5:
+        case GRID_ROM_SUBSYSTEM+6:
+        case GRID_ROM_SUBSYSTEM+7:
+            break;
+        case GRID_APPROM_SELECT:
+            return dev->grid_rom_select;
+        case GRID_APPROM_ENABLE:
+            return dev->grid_rom_enable;
+        case GRID_TURBO:   
+            return dev->grid_turbo;
+        case GRID_HIGH_ENABLE:
+            return dev->grid_high_enable;
+        case GRID_EMS_PAGE_0:
+        case GRID_EMS_PAGE_1:
+        case GRID_EMS_PAGE_2:
+        case GRID_EMS_PAGE_3: {
+            uint32_t slot = (port >> 14) & 0x3;
+            return dev->grid_ems_page[slot];
+            }
+        default:
+            ;
+    }
+
+    return 0xff;
+}
+
+static void *
+grid_init(const device_t *info)
+{
+    uint32_t slot;
+
+    grid_t *dev = calloc(1, sizeof(grid_t));
+    io_sethandler(GRID_ROM_SUBSYSTEM, 0x0008, grid_io_read, NULL, NULL, grid_io_write, NULL, NULL, dev);
+    io_sethandler(GRID_UNUSED_424, 0x0001, grid_io_read, NULL, NULL, grid_io_write, NULL, NULL, dev);
+    io_sethandler(GRID_426, 0x0001, grid_io_read, NULL, NULL, grid_io_write, NULL, NULL, dev);
+    io_sethandler(GRID_APPROM_SELECT, 0x0001, grid_io_read, NULL, NULL, grid_io_write, NULL, NULL, dev);
+    io_sethandler(GRID_APPROM_ENABLE, 0x0001, grid_io_read, NULL, NULL, grid_io_write, NULL, NULL, dev);
+    io_sethandler(GRID_TURBO, 0x0001, grid_io_read, NULL, NULL, grid_io_write, NULL, NULL, dev);
+    dev->grid_turbo = 0x1;
+
+    io_sethandler(GRID_HIGH_ENABLE, 0x0001, grid_io_read, NULL, NULL, grid_io_write, NULL, NULL, dev);
+    io_sethandler(GRID_EMS_PAGE_0, 0x0001, grid_io_read, NULL, NULL, grid_io_write, NULL, NULL, dev);
+    io_sethandler(GRID_EMS_PAGE_1, 0x0001, grid_io_read, NULL, NULL, grid_io_write, NULL, NULL, dev);
+    io_sethandler(GRID_EMS_PAGE_2, 0x0001, grid_io_read, NULL, NULL, grid_io_write, NULL, NULL, dev);
+    io_sethandler(GRID_EMS_PAGE_3, 0x0001, grid_io_read, NULL, NULL, grid_io_write, NULL, NULL, dev);
+
+    dev->grid_high_enable = 1;
+    for (slot = 0; slot < 4; slot++) {
+        dev->grid_ems_page[slot] = 0;
+        mem_mapping_add(&dev->grid_ems_mapping[slot], GRID_EMS_BASE + (slot << GRID_EMS_PAGE_SHIFT), GRID_EMS_PAGE_SIZE, grid_ems_mem_read8, grid_ems_mem_read16, NULL,
+                        grid_ems_mem_write8, grid_ems_mem_write16, NULL, ram + GRID_EXTENDED_BASE + (slot << GRID_EMS_PAGE_SHIFT), MEM_MAPPING_EXTERNAL, dev);
+        mem_mapping_disable(&dev->grid_ems_mapping[slot]);
+    }
+    flushmmucache();
+    return dev;
+}
+
+static void grid_close(void *priv) {
+    grid_t *dev = (grid_t *)priv;
+    free(dev);
+}
+
+static void grid_reset(void *priv) {
+    grid_t *dev = (grid_t *)priv;
+    uint32_t slot;
+
+    dev->grid_high_enable = 1;
+    mem_mapping_enable(&ram_high_mapping);
+    dev->grid_turbo = 0x1;
+    for (slot = 0; slot < 4; slot++) {
+        dev->grid_ems_page[slot] = 0;
+        mem_mapping_disable(&dev->grid_ems_mapping[slot]);
+    }
+    flushmmucache();
+    dev->grid_unknown = 0;
+    dev->grid_unused_424 = 0;
+    dev->grid_426 = 0;
+    dev->grid_rom_enable = 0;
+    dev->grid_rom_select = 0;
+}
+
+const device_t grid_device = {
+    .name          = "GRiDcase 1520 chipset",
+    .internal_name = "grid1520",
+    .flags         = 0,
+    .local         = 0,
+    .init          = grid_init,
+    .close         = grid_close,
+    .reset         = grid_reset,
+    { .available = NULL },
+    .speed_changed = NULL,
+    .force_redraw  = NULL,
+    .config        = NULL
+};
+
+
+int machine_at_grid1520_init(const machine_t *model) {
+    int ret = 0;
+
+    ret = bios_load_linear("roms/machines/grid1520/grid1520_891025.rom",
+                           0x000f8000, 0x8000, 0);
+    if (bios_only || !ret)
+        return ret;
+
+    machine_at_common_ide_init(model);
+    mem_remap_top(384);
+
+    device_add(&keyboard_at_device);
+    // for now just select CGA with amber monitor 
+    //device_add(&cga_device);
+
+    if (fdc_current[0] == FDC_INTERNAL)
+        device_add(&fdc_at_device);
+
+    device_add(&grid_device);
+
+    return ret;
+}
+
+/*
+ */
+
+
+
diff --git a/src/machine/machine_table.c b/src/machine/machine_table.c
index 580ca541d..5c8da9ee8 100644
--- a/src/machine/machine_table.c
+++ b/src/machine/machine_table.c
@@ -3247,6 +3247,45 @@ const machine_t machines[] = {
         .snd_device = NULL,
         .net_device = NULL
     },
+    {
+        .name = "[ISA] GRiD GRiDcase 1520",
+        .internal_name = "grid1520",
+        .type = MACHINE_TYPE_286,
+        .chipset = MACHINE_CHIPSET_PROPRIETARY,
+        .init = machine_at_grid1520_init,
+        .p1_handler = NULL,
+        .gpio_handler = NULL,
+        .available_flag = MACHINE_AVAILABLE,
+        .gpio_acpi_handler = NULL,
+        .cpu = {
+            .package = CPU_PKG_286,
+            .block = CPU_BLOCK_NONE,
+            .min_bus = 6000000,
+            .max_bus = 10000000,
+            .min_voltage = 0,
+            .max_voltage = 0,
+            .min_multi = 0,
+            .max_multi = 0
+        },
+        .bus_flags = MACHINE_AT,
+        .flags = MACHINE_IDE /*| MACHINE_VIDEO_FIXED*/,
+        .ram = {
+            .min = 1024,
+            .max = 8192,
+            .step = 1024
+        },
+        .nvrmask = 127,
+        .kbc_device = NULL,
+        .kbc_p1 = 0xff,
+        .gpio = 0xffffffff,
+        .gpio_acpi = 0xffffffff,
+        .device = NULL,
+        .fdc_device = NULL,
+        .sio_device = NULL,
+        .vid_device = NULL,
+        .snd_device = NULL,
+        .net_device = NULL
+    },
     /* Has Quadtel KBC firmware. */
     {
         .name = "[GC103] Quadtel 286 clone",