Diskette Drive Type Byte (X
'
010
'
): This byte indicates the type of
the installed diskette drive.
Figure
2-21. Diskette Drive Type Byte (X
'
010
'
)
Bit
Drive Type
7–4
Diskette drive type
3–0
Reserved
Bits 7–4
These bits indicate the diskette drive type.
Figure
2-22. Diskette Drive Type Bits 7–4
Bits 7–4
Description
0 1 1 0
0 1 0 0
Diskette drive (2.88 MB)
Diskette drive (1.44 MB)
Note: Combinations not shown are reserved.
Bits 3–0
These bits are reserved.
Hard Disk Drive Type Byte (X
'
011
'
): This byte defines the type of
hard disk drive installed. X
'
00
'
indicates that no hard disk drive is
installed.
Figure
2-23. Hard Disk Type Byte (X
'
011
'
)
Bit
Drive Type
7–4
3–0
Hard disk drive type 2
Hard disk drive type 3
Figure
2-24. Hard Disk Drive Type 2 (Bits 7–4)
Bit 7–4
Description
0 0 0 0
1 1 1 1
No drive installed for hard disk drive 2
Use CMOS X
'
1B
'
for hard disk drive 2
Figure
2-25. Hard Disk Drive Type 3 (Bits 3–0)
Bit 3–0
Description
0 0 0 0
1 1 1 1
No drive installed for hard disk drive 3
Use CMOS X
'
1C
'
for hard disk drive 3
2-24
ThinkPad 560Z System Board
