ABIT COMPUTER CORPORATION
486 VESA/486 ISA
Processor | 80486SX/80487SX/80486DX/80486DX2 |
Processor Speed | 25/33/40/50(internal)/50/66(internal)MHz |
Chip Set | UNI |
Max. Onboard DRAM | 32MB |
Cache | 64/128/256KB |
BIOS | AMI/Award |
Dimensions | 330mm x 218mm |
I/O Options | 32-bit VESA local bus slots (2) |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Power LED & keylock | JW1 | Reset switch | JW5 |
Speaker | JW2 | External battery | JP16 |
Turbo LED | JW3 | 32-bit VESA local bus slots | S1 & S2 |
Turbo switch | JW4 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Factory configured - do not alter | JP1 | Closed |
» | Factory configured - do not alter | JP2 | Closed |
» | Factory configured - do not alter | JP3 | pins 1 & 2 closed |
» | Factory configured - do not alter | JP9 | Closed |
» | Factory configured - do not alter | JP10 | Closed |
» | Monitor type select monochrome | JP11 | pins 1 & 2 closed |
Monitor type select color | JP11 | pins 2 & 3 closed | |
» | Factory configured - do not alter | JP12 | Closed |
» | Factory configured - do not alter | JP14 | Closed |
» | CMOS memory normal operation | JP15 | pins 2 & 3 closed |
CMOS memory clear | JP15 | pins 1 & 2 closed | |
» | Factory configured - do not alter | JP17 | Closed |
» | Factory configured - do not alter | JP18 | Closed |
» | Factory configured - do not alter | JP19 | Closed |
» | Factory configured - do not alter | JP20 | Closed |
» | Factory configured - do not alter | JP21 | Closed |
» | Factory configured - do not alter | JP22 | Closed |
» | Factory configured - do not alter | JP23 | Closed |
» | Factory configured - do not alter | JP24 | Closed |
» | Factory configured - do not alter | JPX4 | Closed |
» | Factory configured - do not alter | JPX5 | 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 |
CACHE CONFIGURATION | ||||
Size | Max Cachable | Bank 0 | Bank 1 | TAG |
64KB | 8MB | (4) 8K x 8 | (4) 8K x 8 | 8K x 8 |
128KB | 16MB | (4) 32K x 8 | NONE | 8K x 8 |
256KB | 32MB | (4) 32K x 8 | (4) 32K x 8 | 32K x 8 |
CACHE JUMPER CONFIGURATION | |||
Size | JPX10 | JPX20 | JPX30 |
64KB | Closed | Open | Open |
128KB | Open | Closed | Open |
256KB | Open | Open | Closed |
CPU SPEED CONFIGURATION | ||||||
Speed | JP4 | JP28 | JP29 | JP31 | JP32 | JP33 |
25MHz | 1 & 2 | 1 & 2 | 1 & 2 | Closed | Open | Closed |
33MHz | 1 & 2 | 1 & 2 | 1 & 2 | Closed | Closed | Open |
40MHz | 2 & 3 | 2 & 3 | 2 & 3 | Open | Closed | Closed |
50iMHz | 1 & 2 | 1 & 2 | 1 & 2 | Closed | Open | Closed |
50MHz | 2 & 3 | 2 & 3 | 2 & 3 | Closed | Open | Closed |
66iMHz | 1 & 2 | 1 & 2 | 1 & 2 | Closed | Closed | Open |
NotePins designated should be in the closed position. |
CPU TYPE CONFIGURATION | ||||
CPU Type | JP5-JP8, JP25 | JPX1 | JPX2 | JPX3 |
80486SX | pins 1 & 2 closed | Open | Closed | Closed |
80487SX | pins 1 & 2 closed | Open | Open | Closed |
80486DX, DX2 | pins 1 & 2 closed | Closed | Open | Open |
VESA WAIT STATE/BUS SPEED CONFIGURATION | |||
CPU speed | Wait States | JP26 | JP27 |
< 33MHz | O wait states | pins 1 & 2 closed | pins 1 & 2 closed |
> 33MHz | 1 wait state | pins 2 & 3 closed | pins 2 & 3 closed |