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Memory Setting - Sony 486DX User Manual

Industrial grade 486dx/dx2/dx4 cpu card
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3.2.8 Memory Setting

(1) Cache RAM Size Select (JP8)
The AR-B1474 can be configured to provide a write-back or write-through cache scheme and support 128KB to
512KB cache systems. A write-back cache system may provide better performance than a write-through cache
system. The BIOS Setup program allows you to set the cache scheme either write-back or write-through, either
the internal cache selection.
The AR-B1474 needs four 32Kx8 SRAM chips to construct 128KB cache. To construct 256KB cache, four 64Kx8
SRAM chips are needed. Four 128Kx8 SRAM chips will provide 512KB cache.
(3) DRAM Configuration
There is one 32-bit memory bank on the AR-B1474 card. It can be one-side or double-side SIMM (Single-Line
Memory Modules) which is designed to accommodate 256Kx36 bit to 8Mx36 bit SIMMs. This provides the user
with up to 32MB of main memory. The 32-bit SIMM (without parity bit) also can be used on AR-B1474 card. There
are six on-board memory configurations available. Please refer to the following table for details:
JP8
3
4
3
1
2
1
128KB
256KB
Figure 3-15 JP8: Cache RAM Size Select
SIMM1
256KX32(X36)
512KX32(X36)
1MX32(X36)
2MX32(X36)
4MX32(X36)
8MX32(X36)
Table 3-7 DRAM Configuration
JP8
JP8
4
3
4
2
1
2
512KB
(Factory Preset)
Total Memory
1MB
2MB
4MB
8MB
16MB
32MB
AR-B1474 User¡ ¦ s Guide
3-9

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