Section 2. System Board
Description . . . . . . . . . . . . . .
Microprocessor . . . . . . . . . . . . .
Cache Memory
Cacheable Address
Keyboard/Mouse Connector . . . . . . . . . .
Scan Codes . . . . . . . . . . . . .
Keyboard ID . . . . . . . . . . . . .
Displayable Characters and
Hard Disk Drive
External Connector . . . . . . . . . . . .
Diskette Drive and Controller. . . . . . . . . . . . . . .
Diskette Drive
Memory | ||||||||||
ROM Subsystem | . | |||||||||
RAM Subsystem | . | . . . . . . . . . . . | ||||||||
System Memory Map . . . . . . . . . . . . . . . . . 2. | ||||||||||
System Board Memory Connector for |
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RT/CMOS RAM |
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RT/CMOS | Address | and | NMI | Mask | Register | (Hex | 0070) | |||
RT/CMOS Data Register (Hex |
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RT/CMOS | RAM | I/O |
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CMOS RAM | Configuration |
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Miscellaneous | System | Functions | and |
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Nonmaskable | Interrupt |
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System | Control | Port | B |
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System | Control | Port | A | (Hex |
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Selectable |
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Hardware Compatibility . | . . | . . | . . . | . . | ||||||
Error Codes . . . | . | . . | . . | . . . | . . |
Copyright IBM Corp. 1996, 1997 |