UNIDENTIFIED
80486-33B
Processor | 80486SX/80487SX/80486DX |
Processor Speed | 33MHz |
Chip Set | OPTI |
Max. Onboard DRAM | 32MB |
SRAM Cache | 64/256KB |
BIOS | AMI |
Dimensions | 330mm x 218mm |
I/O Options | None |
NPU Options | 4167 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | J11 | Turbo LED | JP11 |
Power LED & keylock | J20 | Reset switch | SW1 |
Speaker | J21 | Turbo switch | SW2 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
CMOS memory normal operation | JP1 | pins 2 & 3 closed | |
CMOS memory clear | JP1 | pins 1 & 2 closed | |
» | Monitor type select color | JP2 | closed |
Monitor type select monochrome | JP2 | open | |
Factory configured - do not alter | JP6 | closed | |
» | CPU speed select iOSC(Y2)/2 | JP7 | pins 2 & 3 closed |
CPU speed select iOSC(Y2)/1 | JP7 | pins 1 & 2 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 |
20MB | (4) 4M x 9 | (4) 1M x 9 |
32MB | (4) 4M x 9 | (4) 4M x 9 |
SRAM CONFIGURATION | |||||
Size | Cache SRAM | TAG | JP9 | JP10 | JP12 |
64KB | (8) 8K x 8 | (1) 8K x 8 | open | open | open |
256KB | (8) 32K x 8 | (1) 32K x 8 | closed | closed | closed |
CPU JUMPER CONFIGURATION | |||
CPU | JP3 | JP4 | JP5 |
80486DX | pins 2 & 3 closed | closed | pins 1 & 2 closed |
80487SX | pins 1 & 2 closed | closed | pins 1 & 2 closed |
80486SX | open | open | pins 2 & 3 closed |