diff --git a/BasiliskII/README b/BasiliskII/README
index 890ba53b..e72b5c6f 100644
--- a/BasiliskII/README
+++ b/BasiliskII/README
@@ -524,6 +524,14 @@ nogui <"true" or "false">
   error alerts. All errors will then be reported to stdout. The default
   is "false".
 
+keyboardtype <keyboard-id>
+
+  Specifies the keyboard type that BasiliskII should report to the MacOS.
+  The default is "5" which is a "Apple Extended Keyboard II (ISO)",
+  but many other numbers are understood by most versions of the MacOS
+  (e.g. 11 is a "Macintosh Plus Keyboard with keypad",
+        13 is a "Apple PowerBook Keyboard (ISO)" )
+
 For additional information, consult the source.
 
 
diff --git a/BasiliskII/src/adb.cpp b/BasiliskII/src/adb.cpp
index 788d78f9..fbd4921b 100644
--- a/BasiliskII/src/adb.cpp
+++ b/BasiliskII/src/adb.cpp
@@ -28,8 +28,9 @@
 
 #include "sysdeps.h"
 #include "cpu_emulation.h"
-#include "main.h"
 #include "emul_op.h"
+#include "main.h"
+#include "prefs.h"
 #include "video.h"
 #include "adb.h"
 
@@ -57,6 +58,8 @@ static uint8 mouse_reg_3[2] = {0x63, 0x01};	// Mouse ADB register 3
 static uint8 key_reg_2[2] = {0xff, 0xff};	// Keyboard ADB register 2
 static uint8 key_reg_3[2] = {0x62, 0x05};	// Keyboard ADB register 3
 
+static uint8 m_keyboard_type = 0x05;
+
 // ADB mouse motion lock (for platforms that use separate input thread)
 static B2_mutex *mouse_lock;
 
@@ -68,6 +71,8 @@ static B2_mutex *mouse_lock;
 void ADBInit(void)
 {
 	mouse_lock = B2_create_mutex();
+	m_keyboard_type = (uint8)PrefsFindInt32("keyboardtype");
+	key_reg_3[1] = m_keyboard_type;
 }
 
 
@@ -99,7 +104,7 @@ void ADBOp(uint8 op, uint8 *data)
 		key_reg_2[0] = 0xff;
 		key_reg_2[1] = 0xff;
 		key_reg_3[0] = 0x62;
-		key_reg_3[1] = 0x05;
+		key_reg_3[1] = m_keyboard_type;
 		return;
 	}
 
diff --git a/BasiliskII/src/prefs_items.cpp b/BasiliskII/src/prefs_items.cpp
index ece973ec..00eafb0b 100644
--- a/BasiliskII/src/prefs_items.cpp
+++ b/BasiliskII/src/prefs_items.cpp
@@ -62,6 +62,7 @@ prefs_desc common_prefs_items[] = {
 	{"jitdebug", TYPE_BOOLEAN, false,    "enable JIT debugger (requires mon builtin)"},
 	{"jitcachesize", TYPE_INT32, false,  "translation cache size in KB"},
 	{"jitlazyflush", TYPE_BOOLEAN, false, "enable lazy invalidation of translation cache"},
+	{"keyboardtype", TYPE_INT32, false, "hardware keyboard type"},
 	{NULL, TYPE_END, false, NULL} // End of list
 };
 
@@ -97,4 +98,6 @@ void AddPrefsDefaults(void)
 #else
 	PrefsAddBool("jit", false);
 #endif
+
+    PrefsAddInt32("keyboardtype", 5);
 }