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3.7 Synchronouse SRAM Cache Memory
The synchronous SRAM can not be upgraded. Standard SRAM and Syn-
chronous SRAM can not be installed at the same time. Once installed with
the Synchronous SRAM, the standard SRAM must be removed.
The table below is the configuration sizes of the SRAM:
SRAM Cache Size
256 KB
512KB
* J8 needs to be on 1-2
3.8 CMOS RTC & EISA CFG SRAM
CMOS RTC includes an internal battery and Real Time Clock circuit. It
provides the date and the time to the system. CFG SRAM is used to keep
information of EISA device configuration for automatic system bootup.
Normally the life time of a RTC internal battery is 10 years. when replacing,
you should use the same model.
3.9 Speaker Connector Installation
S1462 provides a 4-Pin header J19 to connect the speaker. The polarity
can go either way.
3.10 Turbo Switch J16
Most case's panel has a turbo switch to control system speed. Slower
execution speed is required for the programs developed for the old XT.
Because Pentium cannot slow its clock speed on the fly, S1462 uses simu-
lation method to implement TURBO switching function. The J12 on the
mainboard should be connected to the TURBO switch on case panel.
S1642-001-01
Number and Size
Four 32K*18
Four 64K*18
17
J7
2-3
1-2
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