3-7
Installing System Memory and Add-On Peripherals
Installing Cache Memory
Warning:
SRAM are very static sensitive. Follow all anti-static procedures explained
in Chapter 2 before handling these devices.
In addition to the internal (L1) cache built into the 486 processor, the M4Pe
also supports external (L2) cache. The M4Pe is available with 128K, 256K,
or 512K external cache.
Upgrading to 256K Cache
Boards with 128K can be upgraded to 256K by adding four 32K x 8 SRAM
chips, rated at 15 nanoseconds or faster (Figure 3-3). Complete the following
steps to upgrade your system to 256K:
1.
Turn off the computer system and remove its cover.
2.
Locate Sockets U20, U21, U22, and U23.
3.
Align the notch on the SRAM chip with the notch on the socket..
4.
Carefully place the chips into place, making sure each pin is inserted
into the proper receptacle.
5.
Configure the jumpers for 256K of Level 2 Cache (Table 2-1).