diff --git a/contrib/windows/installer/dosbox-x.reference.setup.conf b/contrib/windows/installer/dosbox-x.reference.setup.conf
index 28a9e7965..9b06df3d7 100644
--- a/contrib/windows/installer/dosbox-x.reference.setup.conf
+++ b/contrib/windows/installer/dosbox-x.reference.setup.conf
@@ -707,7 +707,7 @@ pc-98 anex86 font                        =
 #          j3100: With the setting dosv=jp and a non-off value of this option, the Toshiba J-3100 machine will be emulated with DCGA support.
 #                   Setting to "on" or "auto" starts J-3100 automatically, and with the setting "manual" you can enter J-3100 mode with DCGA command.
 #                   Possible values: off, on, auto, manual, 0, 1, 2.
-#      j3100type: Specifies the machine type for the Toshiba J-3100 emulation if enabled.
+#      j3100type: Specifies the Toshiba J-3100 machine type if J-3100 mode is enabled. The color palette will be changed with different machine types.
 #                   Possible values: default, gt, sgt, gx, gl, sl, sgx, ss, gs, sx, sxb, sxw, sxp, ez, zs, zx.
 dosv           = off
 getsysfont     = true
diff --git a/dosbox-x.reference.conf b/dosbox-x.reference.conf
index f700a5656..20916d5e9 100644
--- a/dosbox-x.reference.conf
+++ b/dosbox-x.reference.conf
@@ -342,7 +342,7 @@ pc-98 anex86 font               =
 #          j3100: With the setting dosv=jp and a non-off value of this option, the Toshiba J-3100 machine will be emulated with DCGA support.
 #                   Setting to "on" or "auto" starts J-3100 automatically, and with the setting "manual" you can enter J-3100 mode with DCGA command.
 #                   Possible values: off, on, auto, manual, 0, 1, 2.
-#      j3100type: Specifies the machine type for the Toshiba J-3100 emulation if enabled.
+#      j3100type: Specifies the Toshiba J-3100 machine type if J-3100 mode is enabled. The color palette will be changed with different machine types.
 #                   Possible values: default, gt, sgt, gx, gl, sl, sgx, ss, gs, sx, sxb, sxw, sxp, ez, zs, zx.
 dosv           = off
 getsysfont     = true
diff --git a/dosbox-x.reference.full.conf b/dosbox-x.reference.full.conf
index fb3bb19c5..8a628b5dd 100644
--- a/dosbox-x.reference.full.conf
+++ b/dosbox-x.reference.full.conf
@@ -687,7 +687,7 @@ pc-98 show graphics layer on initialize  = true
 #          j3100: With the setting dosv=jp and a non-off value of this option, the Toshiba J-3100 machine will be emulated with DCGA support.
 #                   Setting to "on" or "auto" starts J-3100 automatically, and with the setting "manual" you can enter J-3100 mode with DCGA command.
 #                   Possible values: off, on, auto, manual, 0, 1, 2.
-#      j3100type: Specifies the machine type for the Toshiba J-3100 emulation if enabled.
+#      j3100type: Specifies the Toshiba J-3100 machine type if J-3100 mode is enabled. The color palette will be changed with different machine types.
 #                   Possible values: default, gt, sgt, gx, gl, sl, sgx, ss, gs, sx, sxb, sxw, sxp, ez, zs, zx.
 dosv           = off
 getsysfont     = true
diff --git a/include/dos_inc.h b/include/dos_inc.h
index a66964dff..b53870512 100644
--- a/include/dos_inc.h
+++ b/include/dos_inc.h
@@ -38,8 +38,10 @@ struct CommandTail{
 #pragma pack ()
 #endif
 
-#define IS_DOS_JAPANESE (mem_readb(Real2Phys(dos.tables.dbcs) + 0x02) == 0x81 && mem_readb(Real2Phys(dos.tables.dbcs) + 0x03) == 0x9F)
-#define IS_DOS_CJK ((mem_readb(Real2Phys(dos.tables.dbcs) + 0x02) == 0x81 || mem_readb(Real2Phys(dos.tables.dbcs) + 0x02) == 0xA1) && (mem_readb(Real2Phys(dos.tables.dbcs) + 0x03) == 0x9F || mem_readb(Real2Phys(dos.tables.dbcs) + 0x03) == 0xFE))
+extern bool dos_kernel_disabled;
+
+#define IS_DOS_JAPANESE (!dos_kernel_disabled && mem_readb(Real2Phys(dos.tables.dbcs) + 0x02) == 0x81 && mem_readb(Real2Phys(dos.tables.dbcs) + 0x03) == 0x9F)
+#define IS_DOS_CJK (!dos_kernel_disabled && ((mem_readb(Real2Phys(dos.tables.dbcs) + 0x02) == 0x81 || mem_readb(Real2Phys(dos.tables.dbcs) + 0x02) == 0xA1) && (mem_readb(Real2Phys(dos.tables.dbcs) + 0x03) == 0x9F || mem_readb(Real2Phys(dos.tables.dbcs) + 0x03) == 0xFE)))
 #define IS_DOSV (dos.set_jdosv_enabled || dos.set_kdosv_enabled || dos.set_cdosv_enabled || dos.set_pdosv_enabled)
 #define IS_JDOSV (dos.set_jdosv_enabled)
 #define IS_KDOSV (dos.set_kdosv_enabled)
diff --git a/src/dosbox.cpp b/src/dosbox.cpp
index 522b9a288..b739c0843 100644
--- a/src/dosbox.cpp
+++ b/src/dosbox.cpp
@@ -2153,7 +2153,7 @@ void DOSBOX_SetupConfigSections(void) {
 
 	Pstring = secprop->Add_string("j3100type",Property::Changeable::OnlyAtStart,"default");
 	Pstring->Set_values(j3100_types);
-	Pstring->Set_help("Specifies the machine type for the Toshiba J-3100 emulation if enabled.");
+	Pstring->Set_help("Specifies the Toshiba J-3100 machine type if J-3100 mode is enabled. The color palette will be changed with different machine types.");
     Pstring->SetBasic(true);
 
     secprop=control->AddSection_prop("video",&Null_Init);