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 |