Hardware Installation
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15
3.5. SRAM INSTALLATION AND JUMPERS SETUP
The cache memory system consists of Data SRAM & TAG SRAM (U12), the
Data SRAM type is 32Kx8-15/20 ns, 64Kx8-15/20 ns or 128Kx8-15/20 ns.
The mainboard can be installed with 256 KB, 512 KB or 1 MB cache memory
when using 32Kx8, 64Kx8, 128Kx8 type DATA SRAM separately. Please refer to
the following table to install cache memory system :
SIZE
Data SRAM
JP2
JP1
TAG SRAM (U12)
256 KB
32 KB x 8
1 - 2
1 - 2
8 KB x 8 - 32 K x 8
512 KB
64 KB x 8
2 - 3
1 - 2
16 KB x 8,32 K x 8
1
MB
128 KB x 8
2 - 3
2 - 3
32 KB x 8
Because there are not standard IC's coding number of SRAM, refer to the
following table to identify the SRAM component:
16 K x 8
32 K x 8
64 K x 8
128 K x 8
AE88128AK-15
W24257AK-15/20
W24512AK-15/20
W241024AK-15/20
UM61256-15/20
AS7C512-15/20
AS7C1024-15/20
AS7C256-15/20
UM61512AK-15/20
UM611024AK-15/20
CY7C199-20
MCM6206-20
KM68257BP-20
TC555328P-20
3.6. CPU INSTALLATION AND JUMPERS SETUP
The system's speed depends on the frequency of CLOCK GENERATOR. The
user can change the JUMPER
(JP21)
selection to set up the system speed to 60
MHz or 66 MHz for 60 or 66 MHz PENTIUM
CPU.
The mainboard can use PENTIUM
or P5T CPU, and the CPU speed must
match with the frequency of CLOCK GEN. It will cause system hanging up if the
CLOCK GEN.'S frequency is higher than CPU's.
JP21
CPU Type
CLK. GEN. Speed
CPU Speed
2 - 3
PENTIUM
- 66
66.667 MHz
66.667 MHz
1 - 2
PENTIUM
- 60
60 MHz
60 MHz
