VL-BUS MAINBOARD Motherboard Settings and Configuration
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VL-BUS MAINBOARD
Processor | 80486SX/80487SX/80486DX/ODP486SX/80486DX2 |
Processor Speed | 20/25/33/50(internal)/50/66(internal)MHz |
Chip Set | UNI |
Max. Onboard DRAM | 32MB |
SRAM Cache | 32/64/128/256KB |
BIOS | AMI |
Dimensions | 254mm x 218mm |
I/O Options | 32-bit VESA local-bus card slots (3) |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Turbo switch | J4 | External battery | J8 |
Turbo LED | J5 | Reset switch | J10 |
Speaker | J6 | 32-bit VESA local-bus cards (3) | S1 - S3 |
Power LED & keylock | J7 |
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USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Monitor type select color | J11 | closed |
| Monitor type select monochrome | J11 | open |
» | CMOS memory normal operation (internal battery) | JP2 | pins 1 & 2 closed |
| CMOS memory normal operation (external battery) | JP2 | open |
| CMOS memory clear | JP2 | pins 2 & 3 closed |
» | VESA local bus speed select (CPU £ 33MHz) | JP19 | closed |
| VESA local bus speed select (CPU > 33MHz) | JP19 | open |
» | VESA local bus wait states select 0 (CPU >33MHz) | JP20 | closed |
| VESA local bus wait state select 1 (CPU £ 33MHz) | JP20 | open |
» | VESA local bus speed select CPU/1 | JP43 | pins 1 & 2 closed |
| VESA local bus speed select CPU/2 | JP43 | pins 2 & 3 closed |
» | CPU speed select £ 33MHz | JP44 | pins 2 & 3 closed |
| CPU speed select > 33MHz | JP44 | pins 1 & 2 closed |
CPU TYPE CONFIGURATION | |
CPU | J4 |
80486DX2 | pins 1 & 2, 4 & 5, and 6 & 7 closed |
ODP487SX | pins 2 & 3, 4 & 5, and 6 & 7 closed |
80486DX | pins 1 & 2, 4 & 5, and 6 & 7 closed |
80487SX | pins 5 & 6 closed |
80486SX | pins 2 & 3, 4 & 5, and 6 & 7 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 |
5MB | (4) 256K x 9 | (4) 1M x 9 |
8MB | (4) 1M x 9 | (4) 1M x 9 |
16MB | (4) 4M x 9 | NONE |
20MB | (4) 1M x 9 | (4) 4M x 9 |
32MB | (4) 4M x 9 | (4) 4M x 9 |
SRAM CONFIGURATION | |||
Size | Cache | Location | TAG |
32KB | (4) 8K x 8 | Bank 0 | (1) 8K x 8 |
64KB | (8) 8K x 8 | Banks 0 & 1 | (1) 8K x 8 |
128KB | (4) 32K x 8 | Bank 0 | (1) 32K x 8 |
256KB | (8) 32K x 8 | Banks 0 & 1 | (1) 32K x 8 |
SRAM JUMPER CONFIGURATION | ||||
Size | J17 | J18 | J19 | J20 |
32KB | open | open | open | pins 2 & 3 closed |
64KB | open | closed | open | pins 1 & 2 closed |
128KB | open | closed | closed | pins 1 & 2 and 3 & 4 closed |
256KB | closed | closed | closed | pins 1 & 2 and 4 & 5 closed |
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