diff --git a/src/device.h b/src/device.h
index 3c91dceef..0ad0a54e1 100644
--- a/src/device.h
+++ b/src/device.h
@@ -38,10 +38,13 @@ enum {
     DEVICE_NOT_WORKING = 1,	/* does not currently work correctly and will be disabled in a release build*/
     DEVICE_AT = 2,		/* requires an AT-compatible system */
     DEVICE_PS2 = 4,		/* requires a PS/1 or PS/2 system */
+    DEVICE_ISA = 8,		/* requires the ISA bus */
+    DEVICE_CBUS = 0x10,		/* requires the C-BUS bus */
     DEVICE_MCA = 0x20,		/* requires the MCA bus */
-    DEVICE_VLB = 0x40,		/* requires the PCI bus */
-    DEVICE_PCI = 0x80,		/* requires the VLB bus */
-    DEVICE_AGP = 0x100		/* requires the AGP bus */
+    DEVICE_EISA = 0x40,		/* requires the EISA bus */
+    DEVICE_VLB = 0x80,		/* requires the PCI bus */
+    DEVICE_PCI = 0x100,		/* requires the VLB bus */
+    DEVICE_AGP = 0x200		/* requires the AGP bus */
 };
 
 
diff --git a/src/machine/machine.h b/src/machine/machine.h
index eb4ff87f0..3e706a7e9 100644
--- a/src/machine/machine.h
+++ b/src/machine/machine.h
@@ -27,11 +27,12 @@
 #define MACHINE_AT		0x000001	/* PC/AT architecture */
 #define MACHINE_PS2		0x000002	/* PS/2 architecture */
 #define MACHINE_ISA		0x000010	/* machine has ISA bus */
-#define MACHINE_EISA		0x000020	/* machine has EISA bus */
-#define MACHINE_VLB		0x000040	/* machine has VL bus */
-#define MACHINE_MCA		0x000080	/* machine has MCA bus */
-#define MACHINE_PCI		0x000100	/* machine has PCI */
-#define MACHINE_AGP		0x000200	/* machine has AGP */
+#define MACHINE_CBUS		0x000020	/* machine has C-BUS bus */
+#define MACHINE_EISA		0x000040	/* machine has EISA bus */
+#define MACHINE_VLB		0x000080	/* machine has VL bus */
+#define MACHINE_MCA		0x000100	/* machine has MCA bus */
+#define MACHINE_PCI		0x000200	/* machine has PCI */
+#define MACHINE_AGP		0x000400	/* machine has AGP */
 #define MACHINE_HAS_HDC		0x001000	/* machine has internal HDC */
 #define MACHINE_PS2_HDD		0x002000	// can now remove? --FvK
 #define MACHINE_NEC		0x010000