diff --git a/CMakeLists.txt b/CMakeLists.txt
index a632b71ce..777ede9ca 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -178,7 +178,6 @@ cmake_dependent_option(G100           "Matrox Productiva G100"
 cmake_dependent_option(ISAMEM_RAMPAGE "AST Rampage"                              ON    "DEV_BRANCH"  OFF)
 cmake_dependent_option(ISAMEM_IAB     "Intel Above Board"                        ON    "DEV_BRANCH"  OFF)
 cmake_dependent_option(ISAMEM_BRAT    "BocaRAM/AT"                               ON    "DEV_BRANCH"  OFF)
-cmake_dependent_option(OPEN_AT        "OpenAT"                                   ON    "DEV_BRANCH"  OFF)
 cmake_dependent_option(OPL4ML         "OPL4-ML daughterboard"                    ON    "DEV_BRANCH"  OFF)
 cmake_dependent_option(PCL            "Generic PCL5e Printer"                    ON    "DEV_BRANCH"  OFF)
 cmake_dependent_option(SIO_DETECT     "Super I/O Detection Helper"               ON    "DEV_BRANCH"  OFF)
diff --git a/src/include/86box/machine.h b/src/include/86box/machine.h
index d6725ec9a..98667f244 100644
--- a/src/include/86box/machine.h
+++ b/src/include/86box/machine.h
@@ -448,9 +448,6 @@ extern int machine_at_pb286_init(const machine_t *);
 extern int machine_at_siemens_init(const machine_t *); // Siemens PCD-2L. N82330 discrete machine. It segfaults in some places
 
 extern int machine_at_wellamerastar_init(const machine_t *); // Wells American A*Star with custom award BIOS 
-#ifdef USE_OPEN_AT
-extern int machine_at_openat_init(const machine_t *);
-#endif /* USE_OPEN_AT */
 
 /* m_at_286_386sx.c */
 extern int machine_at_tg286m_init(const machine_t *);
diff --git a/src/machine/CMakeLists.txt b/src/machine/CMakeLists.txt
index 2e3bc02bc..8cd54edec 100644
--- a/src/machine/CMakeLists.txt
+++ b/src/machine/CMakeLists.txt
@@ -56,7 +56,3 @@ add_library(mch OBJECT
     m_at_socket370.c
     m_at_misc.c
 )
-
-if(OPEN_AT)
-    target_compile_definitions(mch PRIVATE USE_OPEN_AT)
-endif()
diff --git a/src/machine/m_at.c b/src/machine/m_at.c
index 86fbe3776..13cd831ba 100644
--- a/src/machine/m_at.c
+++ b/src/machine/m_at.c
@@ -388,21 +388,3 @@ machine_at_wellamerastar_init(const machine_t *model)
 
     return ret;
 }
-
-#ifdef USE_OPEN_AT
-int
-machine_at_openat_init(const machine_t *model)
-{
-    int ret;
-
-    ret = bios_load_linear("roms/machines/openat/bios.bin",
-                           0x000f0000, 65536, 0);
-
-    if (bios_only || !ret)
-        return ret;
-
-    machine_at_ibm_common_init(model);
-
-    return ret;
-}
-#endif /* USE_OPEN_AT */
diff --git a/src/machine/machine_table.c b/src/machine/machine_table.c
index 8cdc7444b..408deb615 100644
--- a/src/machine/machine_table.c
+++ b/src/machine/machine_table.c
@@ -8,17 +8,12 @@
  *
  *          Handling of the emulated machines.
  *
- * NOTES:   OpenAT wip for 286-class machine with open BIOS.
- *          PS2_M80-486 wip, pending receipt of TRM's for machine.
- *
- *
- *
  * Authors: Miran Grca, <mgrca8@gmail.com>
  *          Fred N. van Kempen, <decwiz@yahoo.com>
  *          Jasmine Iwanek, <jriwanek@gmail.com>
  *
- *          Copyright 2016-2020 Miran Grca.
- *          Copyright 2017-2020 Fred N. van Kempen.
+ *          Copyright 2016-2025 Miran Grca.
+ *          Copyright 2017-2025 Fred N. van Kempen.
  *          Copyright 2025      Jasmine Iwanek.
  */
 #include <stdio.h>
@@ -3136,48 +3131,6 @@ const machine_t machines[] = {
         .snd_device = NULL,
         .net_device = NULL
     },
-#ifdef USE_OPEN_AT
-    /* Has IBM AT KBC firmware. */
-    {
-        .name = "[ISA] OpenAT",
-        .internal_name = "openat",
-        .type = MACHINE_TYPE_286,
-        .chipset = MACHINE_CHIPSET_DISCRETE,
-        .init = machine_at_openat_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 = 0,
-            .max_bus = 0,
-            .min_voltage = 0,
-            .max_voltage = 0,
-            .min_multi = 0,
-            .max_multi = 0
-        },
-        .bus_flags = MACHINE_AT,
-        .flags = MACHINE_FLAGS_NONE,
-        .ram = {
-            .min = 256,
-            .max = 15872,
-            .step = 128
-        },
-        .nvrmask = 63,
-        .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
-    },
-#endif /* USE_OPEN_AT */
     /* Has IBM AT KBC firmware. */
     {
         .name = "[ISA] Phoenix IBM AT",