+// DMA channel 3 used by hard disk BIOS
+#define CBT_F1_DMA3USED (1<<7)
+// 2nd interrupt controller (8259) installed
+#define CBT_F1_2NDPIC (1<<6)
+// Real-Time Clock installed
+#define CBT_F1_RTC (1<<5)
+// INT 15/AH=4Fh called upon INT 09h
+#define CBT_F1_INT154F (1<<4)
+// wait for external event (INT 15/AH=41h) supported
+#define CBT_F1_WAITEXT (1<<3)
+// extended BIOS area allocated (usually at top of RAM)
+#define CBT_F1_EBDA (1<<2)
+// bus is Micro Channel instead of ISA
+#define CBT_F1_MCA (1<<1)
+// system has dual bus (Micro Channel + ISA)
+#define CBT_F1_MCAISA (1<<0)
+
+// INT 16/AH=09h (keyboard functionality) supported
+#define CBT_F2_INT1609 (1<<6)