UNIDENTIFIED
450L2 CACHE
Processor | 80486SX/80487SX/80486DX/ODP486SX/80486DX2 |
Processor Speed | 20/25/33/50 (Internal)/50/66 (Internal)MHz |
Chip Set | OPTI |
Max. onboard DRAM | 32MB |
Cache | 64/128/256KB |
BIOS | AMI |
Dimensions | 330mm x 218mm |
I/O Options | 32-bit local bus slots (2) |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | J1 | Turbo LED | JP10 |
Speaker | J17 | 32-bit local bus slot | S1 |
Power LED & keylock | J18 | S2 | |
Turbo switch | JP9 | Reset | SW1 |
Note:The exact locations of local bus slots S1 and S2 are unknown. |
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 | |
» | Ready signal select ISA | JP3 & JP4 | pins 1 & 2 closed |
Ready signal select Local bus | JP3 & JP4 | pins 2 & 3 closed | |
» | CPU upgrade (486PQFP to 486PGA) enabled | JP17 | Closed |
CPU upgrade (486PQFP to 486PGA) disabled | JP17 | Open | |
Note:The location of jumpers JP3 and JP4 is unknown. |
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) 1M x 9 | (4) 256K 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 | Bank 0 | Bank 1 | TAG (U39) | TAG (U40) |
64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 | NONE |
128KB | (4) 32K x 8 | NONE | (1) 8K x 8 | NONE |
256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 8K x 8 | (1) 8K x 8 |
CACHE JUMPER CONFIGURATION | ||||||
Size | JP5 | JP6 | JP7 | JP8 | JP15 | JP16 |
64KB | Open | Open | Open | pins 2 & 3 | Open | Open |
128KB | Closed | Open | Closed | pins 1 & 2 | Open | Closed |
256KB | Closed | Closed | Closed | pins 2 & 3 | Closed | Closed |
CPU SPEED CONFIGURATION | ||||
Speed | JP11 | JP12 | JP13 | JP14 |
20MHz | Closed | Closed | Open | Open |
25MHz | Open | Closed | Open | Closed |
33MHz | Open | Open | Closed | Closed |
50i MHz | Open | Closed | Open | Closed |
50MHz | Open | Open | Closed | Open |
66MHz | Open | Open | Closed | Closed |
CPU TYPE CONFIGURATION | |||
Type | JP18 | JP19 | JP20 |
80486SX PQFP | Open | Closed | pins 2 & 3 closed |
80486SX PGA | Open | Open | pins 2 & 3 closed |
80487SX | pins 2 & 3 closed | Closed | pins 1 & 2 closed |
80486DX | pins 1 & 2 closed | Closed | pins 1 & 2 closed |
ODP486SX | Open | Open | pins 2 & 3 closed |
80486DX2 | pins 1 & 2 closed | Closed | pins 1 & 2 closed |