UNIDENTIFIED
50/33/25/20MHZ MAINBOARD
Processor | 80486SX/80487SX/80486DX/80486DX2 |
Processor Speed | 20/25/33/40/50 (Internal) /50/66 (Internal) |
Chip Set | C & T |
Max. onboard DRAM | 32MB |
Cache | 64/128/256KB |
BIOS | AMI |
Dimensions | 330mm x 218mm |
I/O Options | None |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Power LED & keylock | J17 | External battery | J20 |
Speaker | J18 | Turbo switch | J21 |
Reset switch | J19 | Turbo LED | J22 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper/Switch | Position | |
» | Monitor type select monochrome | JP3 | Open |
Monitor type select color | JP3 | Closed | |
» | CMOS memory normal operation | JP5 | Pins 1 & 2 closed |
CMOS memory clear | JP5 | 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 |
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 |
CACHE CONFIGURATION | ||||
Size | Max Cachable | Bank 0 | Bank 1 | TAG |
64KB | 16MB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
128KB | 32MB | (4) 32K x 8 | NONE | (1) 8K x 8 |
256KB | 64MB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
CACHE JUMPER CONFIGURATION | ||
Size | JP24 | JP25 |
64KB | Open | Open |
128KB | Pins 1 & 2 closed | Pins 1 & 2 closed |
256KB | Pins 2 & 3 closed | Pins 2 & 3 closed |
CPU SPEED CONFIGURATION | |
Speed | JP21 |
80486SX/20MHz | Pins 5 & 6 closed |
80486SX/25MHz | Pins 1 & 2, 5 & 6 closed |
80486SX/33MHz | Pins 1 & 2, 3 & 4 closed |
80487SX/20MHz | Pins 5 & 6 closed |
80486DX/25MHz | Pins 1 & 2, 5 & 6 closed |
80486DX/33MHz | Pins 1 & 2, 3 & 4 closed |
80486DX/40MHz | Pins 5 & 6 closed |
80486DX/50MHz | Pins 3 & 4 closed |
80486DX2/50i MHz | Pins 1 & 2, 5 & 6 closed |
80486DX2/66i MHz | Pins 1 & 2, 3 & 4 closed |
CPU TYPE CONFIGURATION | ||||
TYPE | JP9 | JP11 | JP12 | JP13 |
80486SX/20MHz | Pins 2 & 3 closed | Open | Pins 2 & 3 closed | Pins 2 & 3 closed |
80486SX/25MHz | Pins 1 & 2 closed | Open | Pins 2 & 3 closed | Pins 2 & 3 closed |
80486SX/33MHz | Pins 1 & 2 closed | Open | Pins 2 & 3 closed | Pins 2 & 3 closed |
80487SX/20MHz | Pins 2 & 3 closed | Closed | Pins 2 & 3 closed | Pins 1 & 2 closed |
80486DX/25MHz | Pins 1 & 2 closed | Closed | Pins 1 & 2 closed | Pins 1 & 2 closed |
80486DX/33MHz | Pins 1 & 2 closed | Closed | Pins 1 & 2 closed | Pins 1 & 2 closed |
80486DX/40MHz | Pins 1 & 2 closed | Closed | Pins 1 & 2 closed | Pins 1 & 2 closed |
80486DX/50MHz | Pins 1 & 2 closed | Closed | Pins 1 & 2 closed | Pins 1 & 2 closed |
80486DX2/50i MHz | Pins 1 & 2 closed | Closed | Pins 1 & 2 closed | Pins 1 & 2 closed |
80486DX2/66i MHz | Pins 1 & 2 closed | Closed | Pins 1 & 2 closed | Pins 1 & 2 closed |