486 CPU Board
3-5
Follow these steps to upgrade the second-level cache:
1.
Turn off the system and unplug the power cable from the wall socket.
2.
Detach the CPU board from the system board.
3.
Detach the heat sink by removing the clip and the four screws securing it
to the CPU board.
4.
Remove the original SRAM chips.
5.
Carefully insert the new SRAM chips on the sockets. Be careful not to
bend any pins.
6.
Change the appropriate jumper settings. Refer to Table 3-2 for the settings.
7.
Re-attach the heat sink to the board with the four screws and the clip.
8.
Re-install the CPU board to the system board and connect the appropriate
cables.
Table 3-1 lists the second-level cache upgrade options.
Table 3-1
Second-level Cache Upgrade (486 CPU Board)
Cache Size
SRAM
Tag RAM
Dirty RAM
64 KB
8K*8 x 8
8K*8 x 1
16K*1 x 1
128 KB
32K*8 x 4
8K*8 x 1
16K*1 x 1
256 KB
32K*8 x 8
32K*8 x 1
64K*1 x 1
1 MB
128K*8 x 8
128K*8 x 1
64K*1 x 1
