Section 2. System Board
Description . . . . . . . . . . . . . . 2.-2 . . . . . . . . . . . . . . .
Microprocessor . . . . . . . . . . . . . 2.-2 . . . . . . . . . . . . . .
Cache Memory Operation. . . . . . . . . . . . . . . .2.-2. . .
Cacheable Address Space. . . . . . . . . . . . . . . .2.-3. . .
Keyboard/Mouse Connector . . . . . . . . . . 2-.4 . . . . . . . . . .
Signals . . . . . . . . . . . . . . .2-4. . . . . . . . . . . . . . . .
Connector . . . . . . . . . . . . . .2-4. . . . . . . . . . . . . . .
Scan Codes . . . . . . . . . . . . . 2.-5 . . . . . . . . . . . . . .
Keyboard ID . . . . . . . . . . . . . 2.-6 . . . . . . . . . . . . . .
Displayable Characters and Symbols. . . . . . . . . . . .2-.7 .
Hard Disk Drive Connector. . . . . . . . . . . . . . . . .2-.8 . . .
External Connector . . . . . . . . . . . . 2.-9 . . . . . . . . . . . . .
Diskette Drive and Controller. . . . . . . . . . . . . . . 2.-11. . .
Diskette Drive Connector. . . . . . . . . . . . . . . . .2-.12. . .
| | | | | | | | | | |
Memory | . . . . . . . . . . . . . . .2-13 |
ROM Subsystem | . | . . . . . . . . . . .2-13 |
RAM Subsystem | . | . . . . . . . . . . . 2-.13 |
System Memory Map . . . . . . . . . . . . . . . . . 2. -14. . . . |
System Board Memory Connector for DIMM. . . . . . . .2-14 | |
RT/CMOS RAM | | . | . . . . . . . . . . . 2-.16 |
RT/CMOS | Address | and | NMI | Mask | Register | (Hex | 0070) | 2-17 |
RT/CMOS Data Register (Hex 0071). . . . . . . . . .2-.17 | |
RT/CMOS | RAM | I/O | Operations . . . . . . . . . . . .2-.18. | |
CMOS RAM | Configuration | . . . . . . . . . . . . . .2.-22. . | |
Miscellaneous | System | Functions | and | Ports. . . . . . . . .2.-26 | |
Nonmaskable | Interrupt | (NMI). . . . . . . . . . . . . .2.-26. . | |
System | Control | Port | B | (Hex .0061). . . . . . . . . . .2-.27. | |
System | Control | Port | A | (Hex | 0092). . . . . . . . . . . .2-.28. | |
Power-On Password | . . . . . . . . . . .2-29 |
Selectable Drive-Startup Sequence. . . . . . . . . . . .2-.29. | |
Hardware Compatibility . | . . | . . | . . . | . . | .2-30 |
Error Codes . . . | . | . . | . . | . . . | . . | .2-31 |
Copyright IBM Corp. 1996, 1997 | 2-1 |
