Lenovo ThinkPad 600E Technical Reference Manual for the ThinkPad 600 - Page 48

Hard Disk Drive Type Byte Hex 012, Reserved Bytes Hex 013, Equipment Byte Hex 014, Bits 7

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Hard Disk Drive Type Byte (Hex 012): This byte defines the type of hard disk drive installed. Hex 00 indicates that no hard disk drive is installed. Bit Drive Type 7-4 Hard disk drive 0 3-0 Hard disk drive 1 Figure 2-27. Hard Disk Drive Type Byte Reserved Bytes (Hex 013): These bytes are reserved. Equipment Byte (Hex 014): This byte defines the basic equipment in the system for the power-on diagnostic tests. Bit Description 7, 6 Number of diskette drives 5, 4 Display operating mode 3, 2 Reserved 1 Coprocessor presence 0 Diskette drive 0 presence Figure 2-28. Equipment Byte Bits 7, 6 These bits indicate the number of installed diskette drives. Bits 7,6 0 0 0 1 1 0 1 1 Number of Diskette Drives One drive Reserved Reserved Reserved Figure 2-29. Installed Diskette Drive Bits Bits 5, 4 These bits indicate the operating mode of the display attached to the video port. Bits 5,4 0 0 0 1 1 0 1 1 Display Operating Mode Reserved 40-column mode 80-column mode Monochrome mode Figure 2-30. Display Operating Mode Bits 2-26 System Board

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Hard Disk Drive Type Byte (Hex 012):
This byte defines the type
of hard disk drive installed.
Hex 00 indicates that no hard disk drive
is installed.
Figure
2-27.
Hard Disk Drive Type Byte
Bit
Drive Type
7–4
Hard disk drive 0
3–0
Hard disk drive 1
Reserved Bytes (Hex 013):
These bytes are reserved.
Equipment Byte (Hex 014):
This byte defines the basic equipment
in the system for the power-on diagnostic tests.
Figure
2-28. Equipment Byte
Bit
Description
7, 6
Number of diskette drives
5, 4
Display operating mode
3, 2
Reserved
1
Coprocessor presence
0
Diskette drive 0 presence
Bits 7, 6
These bits indicate the number of installed diskette
drives.
Figure
2-29.
Installed Diskette Drive Bits
Bits 7,6
Number of Diskette Drives
0 0
One drive
0 1
Reserved
1 0
Reserved
1 1
Reserved
Bits 5, 4
These bits indicate the operating mode of the display
attached to the video port.
Figure
2-30.
Display Operating Mode Bits
Bits 5,4
Display Operating Mode
0 0
Reserved
0 1
40-column mode
1 0
80-column mode
1 1
Monochrome mode
2-26
System Board