J-MARK COMPUTER CORPORATION
JET-486
Processor | 80486SX/80487SX/80486DX/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/Award |
Dimensions | 220mm x 220mm |
I/O Options | None |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | J1 | Turbo LED | JP11 |
Speaker | J17 | Reset switch | SW1 |
Power LED & keylock | J18 | 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 |
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 |
17MB | (4) 4M x 9 | (4) 256K x 9 |
20MB | (4) 4M x 9 | (4) 1M x 9 |
32MB | (4) 4M x 9 | (4) 4M x 9 |
CACHE CONFIGURATION | |||
Size | Bank 0 | Bank 1 | TAG |
64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
CACHE JUMPER CONFIGURATION | ||||
Size | JP3 | JP4 | JP6 | JP7 |
64KB | pins 2 & 3 closed | Open | Open | Open |
128KB | pins 1 & 2 closed | Closed | Closed | Open |
256KB | pins 2 & 3 closed | Closed | Closed | Closed |
CPU TYPE CONFIGURATION | |||
Type | JP8 | JP9 | JP10 |
80486SX | pins 2 & 3 closed | Open | Open |
80487SX | pins 1 & 2 closed | Closed | pins 1 & 2 closed |
80486DX | pins 1 & 2 closed | Closed | pins 2 & 3 closed |
80486DX2 | pins 1 & 2 closed | Closed | pins 2 & 3 closed |