diff --git a/Source/CBIOS/cbios.asm b/Source/CBIOS/cbios.asm
index b0ae7c29..737280ce 100644
--- a/Source/CBIOS/cbios.asm
+++ b/Source/CBIOS/cbios.asm
@@ -1670,8 +1670,8 @@ DPB_RF:
 	.DB  	15		; BLM: BLOCK MASK
 	.DB  	0		; EXM: EXTENT MASK
 	.DW  	2047		; DSM: TOTAL STORAGE IN BLOCKS - 1 BLK = (4MB / 2K BLS) - 1 = 2047
-	.DW  	255		; DRM: DIR ENTRIES - 1 = 256 - 1 = 255
-	.DB  	11110000B	; AL0: DIR BLK BIT MAP, FIRST BYTE
+	.DW  	511		; DRM: DIR ENTRIES - 1 = 256 - 1 = 255
+	.DB  	11111111B	; AL0: DIR BLK BIT MAP, FIRST BYTE
 	.DB  	00000000B	; AL1: DIR BLK BIT MAP, SECOND BYTE
 	.DW  	0		; CKS: ZERO FOR NON-REMOVABLE MEDIA
 	.DW  	0		; OFF: RESERVED TRACKS = 0 TRK