U p g r a d i n g

Adding cache memory

An external or second-level cache is an area of dedicated memory with significantly faster access times than the computer’s random- access memory (RAM). A cache controller ensures that the cache always contains a copy of the most recently accessed areas of RAM, so that the processor is able to read it much more quickly.

An external cache is sometimes called a second-level or L2 cache, to distinguish it from the first-level cache contained within the processor itself.

You can improve the performance of the computer significantly by adding cache memory. Note that in Apricot 340 computers only the first 64 Mbytes of RAM can be cached.

To fit cache memory:

1.Turn off the computer and unplug all power cords.

2.Take suitable anti-static precautions and remove the system unit cover.

If you are unfamiliar with the recommended anti-static precautions or the process of removing the system unit cover, refer to Appendix A, “Inside the System Unit”.

3.Remove any expansion cards that could restrict access to the cache socket; disconnect any cables connected to the cards, remove the screws that secure the cards to the rear of the system unit, then remove the cards from the system unit.

4.Use the illustration at the beginning of this chapter to identify the cache socket.

5.Take the cache SIMM out of its anti-static packaging. Hold it by its edges and avoid touching the metal contacts. Align the SIMM with the slot and carefully press it home. It will only fit one way.

7/8 APRICOT 340 OWNER’S HANDBOOK