diff --git a/Source/CBIOS/cbios.asm b/Source/CBIOS/cbios.asm
index e6690f72..84900d30 100644
--- a/Source/CBIOS/cbios.asm
+++ b/Source/CBIOS/cbios.asm
@@ -1350,7 +1350,6 @@ DSK_SELECT1A:
 	LD	B,BF_DIODEVICE	; HBIOS FUNC: REPORT DEVICE INFO
 	RST	08		; GET UNIT INFO, DEVICE TYPE IN D
 	LD	A,D		; DEVICE TYPE -> A
-	AND	$F0		; ISOLATE HIGH BITS
 	CP	DIODEV_FD	; FLOPPY?
 	JR	NZ,DSK_SELECT1B	; IF NOT, DO LBA IO
 	LD	HL,SEKLBA+3	; POINT TO HIGH ORDER BYTE
diff --git a/Source/CPM3/diskio.z80 b/Source/CPM3/diskio.z80
index 8808751b..6652f74d 100644
--- a/Source/CPM3/diskio.z80
+++ b/Source/CPM3/diskio.z80
@@ -493,8 +493,7 @@ media:
 	ld	b,17h			; HBIOS func: report device info
 	call	0FFF0h			; get unit info, device type in D
 	ld	a,d			; device type -> A
-	and	0F0h			; isolate high bits
-	cp	10h			; floppy?
+	cp	01h			; floppy?
 	jr	nz,media1		; if not, do LBA I/O
 	ld	hl,lba+3		; point to high order byte
 	res	7,(hl)			; switch from LBA -> CHS