GA-486TA Motherboard Settings and Configuration
GIGA-BYTE TECHNOLOGY CO., LTD.
GA-486TA
Processor | 80486SX/80486DX/80486DX2/Pentium Overdrive |
Processor Speed | 25/33/40(internal)/50(internal)/50/66(internal)MHz |
Chip Set | OPTI |
Max. Onboard DRAM | 128MB |
Cache | 64/128/256/512KB |
BIOS | AMI |
Dimensions | 330mm x 218mm |
I/O Options | 32-bit VESA local bus slots (2) |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Power LED & keylock | J1 | Turbo switch | J4 |
Reset switch | J2 | Turbo LED | J5 |
Speaker | J3 | 32-bit VESA Local bus slots | SL1 & SL2 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | CPU type select 80486DX/P24T | J6 | pins 1 & 2 closed |
| CPU type select 80486SX | J6 | pins 2 & 3 closed |
» | Monitor type select color | J14 | Closed |
| Monitor type select monochrome | J14 | Open |
» | CMOS memory normal operation | J17 | Open |
| CMOS memory clear | J17 | Closed |
» | Factory configured - do not alter | J18 | pins 2 & 3 closed |
» | Factory configured - do not alter | J23 | pins 2 & 3 closed |
DRAM CONFIGURATION | ||
Size | Bank 0 | Bank 1 |
1MB | (4) 256K x 9 | NONE |
2MB | (4) 256K x 9 | (4) 256K x 9 |
4MB | (4) 1M x 9 | NONE |
8MB | (4) 1M x 9 | (4) 1M x 9 |
16MB | (4) 4M x 9 | NONE |
32MB | (4) 4M x 9 | (4) 4M x 9 |
64MB | (4) 16M x 9 | NONE |
128MB | (4) 16M x 9 | (4) 16M x 9 |
CACHE CONFIGURATION | |||
Size | Bank 0 | Bank 1 | TAG |
64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
128KB | (4) 32K x 8 | NONE | (1) 32K x 8 |
256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
512KB | (1) 128K x 8 | NONE | (1) 32K x 8 |
CACHE JUMPER CONFIGURATION | ||||
Size | J8 | J9 | J10 | J11 |
64KB | Open | Open | Open | N/A |
128KB | Open | Closed | Open | pins 1 & 2 closed |
256KB | Open | Closed | Closed | pins 2 & 3 closed |
512KB | Closed | Closed | Closed | pins 1 & 2 closed |
CPU SPEED CONFIGURATION | |||
Speed | JC0 | JC1 | JC2 |
25MHz | pins 2 & 3 closed | pins 1 & 2 closed | pins 1 & 2 closed |
33MHz | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |
40MHz | pins 2 & 3 closed | pins 2 & 3 closed | pins 1 & 2 closed |
50iMHz | pins 2 & 3 closed | pins 1 & 2 closed | pins 1 & 2 closed |
50MHz | pins 1 & 2 closed | pins 1 & 2 closed | pins 2 & 3 closed |
66iMHz | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |
VESA WAIT STATE/BUS SPEEDCONFIGURATION | |||
CPU speed | Wait states | J31 | J32 |
£ 33MHz | 0 wait states | Open | Open |
> 33MHz | 1 wait state | Closed | Closed |
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