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If the system board has cache memory modules already installed, the com-
puter has 128K of cache memory. Upgrade to 256K by adding memory
modules as follows:
Bank 2
Add four 28-pin modules: 32K
×
8, 25 ns SRAM.
Tag
Replace existing module with one 28-pin module: 32K
×
8,
20 ns SRAM.
If you are installing cache memory in a board with no cache memory previ-
ously installed, install 128K or 256K as follows:
Bank 1
Add four 28-pin modules: 32K
×
8, 25 ns SRAM (for 128K or
256K).
Bank 2
Add four 28-pin modules: 32K
×
8, 25 ns SRAM (for 256K).
Tag
Add one 28-pin module: 32K
×
8, 20 ns SRAM (for 256K)
or
8K
×
8, 20 ns SRAM (for 128K).
Cache memory jumpers are preset at the factory for 128K cache memory.
Reset the jumpers for 256K by moving them forward to cover two jumper
pins, as shown in Figure 4-15 on page 4-19.
Table
5-1. Processor Jumper Settings for J23, J24, and J25
486SX System Boards
486SX
486SX/487
Math
486SX/486
Overdrive
486SX/Pentium
ODP
J23
J24
J25
1, 2
1, 2
1, 2
1, 2
1, 2
2, 3
1, 2
1, 2
2, 3
1, 2
1, 2
2, 3
486DX and 486DX2 System Boards
486DX
486DX2
Pentium ODP
J23
J24
J25
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
2, 3
5-18
Содержание PS/1
Страница 1: ...M achine Types 2133 2155 and 2168...
Страница 2: ......
Страница 3: ...M achine Types 2133 2155 and 2168...
Страница 8: ...Index X 1 vi...
Страница 14: ...xii...
Страница 38: ...1 24...
Страница 40: ...Notes 2 2...
Страница 67: ...Notes Diagnostic Information 2 29...
Страница 95: ...Notes Diagnostic Information 2 57...
Страница 112: ...MAP 1100 continued 003 continued Replace the system board 2 74...
Страница 116: ...MAP 1200 continued 009 Replace the serial port adapter card 2 78...
Страница 134: ...Notes 2 96...
Страница 170: ...3 12...
Страница 173: ...Figure 4 4 170MB and 211MB Drives 2 Jumper Block Figure 4 5 170MB 253MB and 340MB Drives Repair Information 4 3...
Страница 175: ...1005 Cover Cover release Latch Repair Information 4 5...
Страница 178: ...Front View Alignment Slot 5 25 inch Diskette Drive Right DASD Bracket Signal Cable Power Cable Right DASD Bracket 4 8...
Страница 185: ...1045 Riser Card Adapter Card 1035 Left DASD Support Bracket 1010 Repair Information 4 15...
Страница 199: ...2005 Cover Unscrew the two screws behind the front handle Figure 4 19 Cover Removal Rear View Repair Information 4 29...
Страница 200: ...Figure 4 20 Pull Out on the Cover 4 30...
Страница 250: ...5 32...
Страница 252: ...6 2...
Страница 255: ...Catalog Section Parts Catalog 7 3...
Страница 256: ...Assembly 1 Machine Types 2133 and 2155 System Unit Exterior 3 1 2 7 4...
Страница 258: ...Assembly 2 Machine Types 2133 and 2155 System Unit Interior 1 2 3 4 5 6 7 8 11 12 12 10 7 6...
Страница 261: ...12 93F0041 1 Packet Mounting Screws Parts Catalog 7 9...
Страница 262: ...Assembly 3 Machine Type 2168 System Unit Exterior 2 1 7 10...
Страница 264: ...Assembly 4 Machine Type 2168 System Unit Interior 6 7 5 8 9 10 4 2 11 12 13 16 3 21 23 19 18 17 14 15 1 7 12...
Страница 267: ...Parts Catalog 7 15...
Страница 268: ...Assembly 5 Diskette and Hard Disk Drives All Machine Types 1 2 3 4 4 4 4 4 7 16...
Страница 273: ...Parts Catalog 7 21...
Страница 274: ...Assembly 7 Keyboard and Mouse All Machine Types 1 2 7 22...
Страница 284: ...Part Asm Number Index Page 93F2397 2 1 7 7 93F2398 2 1 7 7 93F2399 2 1 7 7 8 4...
Страница 290: ...This page left blank intentionally A 6...
Страница 296: ...This page left blank intentionally A 12...
Страница 298: ...This page left blank intentionally A 14...
Страница 304: ...IBM Part Number 63G2028 IBM United Kingdom PO Box 41 North Harbour Portsmouth PO6 3AU England...