SOYO COMPUTER CO., LTD.
SY-020H
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Processor |
80486SX/80487SX/80486DX |
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Processor Speed |
16/20/25/33/40/50(internal)/50/66(internal)MHz |
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Chip Set |
SIS |
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Max. Onboard DRAM |
32MB |
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Cache |
32/64/128/256KB |
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BIOS |
AMI |
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Dimensions |
245mm x 220mm |
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I/O Options |
None |
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NPU Options |
4167 |
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CONNECTIONS |
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Purpose |
Location |
Purpose |
Location |
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Power LED & keylock |
J17 |
External battery |
J20 |
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Speaker |
J18 |
Turbo switch |
J21 |
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Reset switch |
J19 |
Turbo LED |
J22 |
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Note:The oscillator at OSC1 must match the external speed of the CPU installed. |
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USER CONFIGURABLE SETTINGS |
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Function |
Jumper |
Position |
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Monitor type select monochrome |
JP3 |
Open |
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Monitor type select color |
JP3 |
Closed |
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CMOS memory normal operation |
JP5 |
pins 1 & 2 closed |
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CMOS memory clear |
JP5 |
pins 2 & 3 closed |
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Power good signal detect from board |
JP7 |
pins 1 & 2 closed |
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Power good signal detect from power supply |
JP7 |
pins 2 & 3 closed |
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Keyboard BIOS clock source select programmable timer |
JP18 |
pins 1 & 2 closed |
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Keyboard BIOS clock source select 7MHz |
JP18 |
pins 2 & 3 closed |
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CPU speed select ³ to 25MHz |
JP19 |
pins 1 & 2 closed |
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CPU speed select < 25MHz |
JP19 |
pins 2 & 3 closed |
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DRAM CONFIGURATION |
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Size |
Bank 0 |
Bank 1 |
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1MB |
(4) 256K x 9 |
NONE |
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2MB |
(4) 256K x 9 |
(4) 256K x 9 |
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4MB |
(4) 1M x 9 |
NONE |
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8MB |
(4) 1M x 9 |
(4) 1M x 9 |
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16MB |
(4) 4M x 9 |
NONE |
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20MB |
(4) 1M x 9 |
(4) 4M x 9 |
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32MB |
(4) 4M x 9 |
(4) 4M x 9 |
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CACHE CONFIGURATION |
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Size |
Bank 0 |
Bank 1 |
TAG |
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32KB |
(4) 8K x 8 |
NONE |
(2) 4K x 4 |
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64KB |
(4) 8K x 8 |
(4) 8K x 8 |
(2) 4K x 4 |
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128KB |
(4) 32K x 8 |
NONE |
(2) 16K x 4 |
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256KB |
(4) 32K x 8 |
(4) 32K x 8 |
(2) 16K x 4 |
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CACHE JUMPER CONFIGURATION |
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Size |
JP8 |
JP9 |
JP10 |
JP11 |
JP12 |
JP13 |
JP14 |
JP15 |
JP16 |
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32KB |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
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64KB |
2 & 3 |
1 & 2 |
1 & 2 |
2 & 3 |
1 & 2 |
1 & 2 |
2 & 3 |
2 & 3 |
1 & 2 |
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128KB |
2 & 3 |
2 & 3 |
1 & 2 |
2 & 3 |
2 & 3 |
1 & 2 |
1 & 2 |
1 & 2 |
2 & 3 |
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256KB |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
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Note: Pins designated should be in the closed position. |
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CPU CONFIGURATION |
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Type |
JP24 |
JP25 |
JP26 |
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80486SX |
pins 2 & 3 closed |
Open |
Open |
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80487SX |
pins 1 & 2 closed |
Closed |
pins 2 & 3 closed |
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80486DX |
pins 1 & 2 closed |
Closed |
pins 1 & 2 closed |