Lenovo ThinkPad 600 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