J-MARK COMPUTER CORPORATION
JET-486DX/SX 20/25 NON-CACHE
Processor | 80486SX/80486DX |
Processor Speed | 20/25/33MHz |
Chip Set | ETEQ |
Max. Onboard DRAM | 32MB |
Cache | None |
BIOS | AMI |
Dimensions | 220mm x 220mm |
I/O Options | None |
NPU Options | 80487SX |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Reset switch | J1 | Turbo switch | J4 |
Power LED & keylock | J2 | External battery | JP1 |
Speaker | J3 | Turbo LED | JP5 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Monitor type select color | JP2 | Closed |
Monitor type select monochrome | JP2 | Open | |
» | CMOS memory normal operation | JP3 | Closed |
CMOS memory clear | JP3 | Open | |
» | Factory configured - do not alter | JP12 | Closed |
» | Oscillator speed select 25MHz | JP13 | pins 1 & 2 closed |
Oscillator speed select 20MHz | JP13 | 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) 1 M x 9 |
8MB | (4) 1M x 9 | (4) 1M x 9 |
16MB | (4) 4M x 9 | NONE |
32MB | (4) 4M x 9 | (4) 4M x 9 |
CPU TYPE CONFIGURATION | ||||
Type | JP8 | JP9 | JP10 | JP11 |
80486SX | Open | Open | pins 1 & 2 closed | pins 1 & 2 closed |
80487SX | Closed | Open | Open | pins 2 & 3 closed |
80486DX | Closed | Closed | pins 2 & 3 closed | pins 1 & 2 closed |
CHIPSET TYPE CONFIGURATION | ||||
Type | JP6 | JP7 | JP14 | JP15 |
82C493 | pins 1 & 2 closed | pins 2 & 3 closed | pins 2 & 3 closed | pins 1 & 2 closed |
82C492 | pins 2 & 3 closed | pins 1 & 2 closed | pins 1 & 2 closed | pins 2 & 3 closed |