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GA-486AM
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3.6 DRAM INSTALLATION
This mainboard can be installed with 1, 2, 4, 8, 16 or 32 MB 72 pins SIMM module DRAM.
The DRAM speed of both mainboard is using 60/70 ns. The banks of memory system on
the mianboard includes from SIMM 1 to SIMM 4.
SIMM 1 and SIMM 2 is a group; SIMM 3 and SIMM 4 is the other group. One group
DRAM size can be 2, 4, 8, 16, 32, 64 MB, please install the same DRAM size in one
group. Total DRAM size is 2 MB ~ 128 MB.
The DRAM installation position refer to MAINBOARD LAYOUT, and notice the PIN -1 of
SIMM module must match with the PIN -1 of SIMM socket when the DRAM SIMM module
is installed.
Insert the DRAM SIMM module into the SIMM socket at 45 degree angle. If there is
a
wrong direction of PIN -1, the DRAM SIMM module couldn't be inserted into socket
completely. After completely insert SIMM module into socket, then press the SIMM module
in vertical direction until the left and right metal holders can keep the SIMM module standing
up con-firmly.
3.7 SPEAKER CONNECTOR INSTALLATION
There is always a speaker in AT system for sound purpose. The 4-Pins connector (J3) is
used to connect speaker. The speaker can work well in both direction of connector when it
is installed to the connector (J3) on mainboard.
3.8 POWER LED & KEY LOCK CONNECTOR INSTALLATION
There are a system power LED lamp and a key on the panel of case. The power LED will
light on when system is powered-on, and the key can lock the keyboard input or unlock it,
both of them are connected to a 5 PIN connector. The connector should
be installed to
J4 of mainboard in correct direction.
3.9 TURBO SWITCH CONNECTOR INSTALLATION
The TURBO switch on the panel is used for controlling the system speed. Some program
developed on XT should be executed with a low speed system, so a high speed system
needs the speed switching function to change its running speed.
Because a 80486 CPU cannot accept the real clock speed change when program is
executed, so the mainboard uses cache-enable or disable function to simulate TURBO
switching function. The J2 on mainboard should be connected to the TURBO switch on
panel, and user can push in or pop out the TURBO switch to enable or disable the cache
function of system.
3.10TURBO LED FLASH GREEN LED CONNECTOR
INSTALLATION
The TURBO LED on panel can indicate the current speed status of system. The TURBO
LED connector should be installed to JP2 in correct direction. Normally, the JP2 is a
TURBO LED connector. But when system gets into Green mode, the LED on JP2 will light
on once per second.
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3-7
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