J-MARK COMPUTER CORPORATION
JET-486 CACHE 486-33/486SX-25
|
Processor |
80486SX/80486DX |
|
Processor Speed |
25/33MHz |
|
Chip Set |
ETEQ |
|
Max. Onboard DRAM |
32MB |
|
Cache |
64/256KB |
|
BIOS |
AMI |
|
Dimensions |
330mm x 220mm |
|
I/O Options |
32-bit external memory card slot |
|
NPU Options |
80487SX/4167 |
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CONNECTIONS |
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|
Purpose |
Location |
Purpose |
Location |
|
External battery |
J1 |
Power LED & keylock |
J5 |
|
Reset switch |
J2 |
Speaker |
J6 |
|
Turbo switch |
J3 |
32-bit external memory card |
S1 |
|
Turbo LED |
J4 |
|
|
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USER CONFIGURABLE SETTINGS |
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|
Function |
Jumper |
Position |
|
|
» |
Factory configured - do not alter |
JP1 |
N/A |
|
» |
Monitor type select monochrome |
JP2 |
Open |
|
|
Monitor type select color |
JP2 |
Closed |
|
» |
CMOS memory normal operation |
JP3 |
Closed |
|
|
CMOS memory clear |
JP3 |
Open |
|
» |
Factory configured - do not alter |
JP4 |
N/A |
|
» |
Factory configured - do not alter |
JP11 |
N/A |
|
» |
Factory configured - do not alter |
JP12 |
N/A |
|
» |
Factory configured - do not alter |
JP13 |
N/A |
|
» |
Factory configured - do not alter |
JP14 |
N/A |
|
» |
Factory configured - do not alter |
JP21 |
N/A |
|
» |
Factory configured - do not alter |
JP23 |
N/A |
|
» |
Factory configured - do not alter |
JP24 |
N/A |
|
DRAM CONFIGURATION |
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|
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 |
|
CACHE CONFIGURATION |
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|
Size |
Bank 0 |
TAG (U22) |
TAG (U23) |
|
64KB |
(8) 8K x 8 |
(1) 16K x 4 |
NONE |
|
256KB |
(8) 32K x 8 |
(1) 16K x 4 |
(1) 16K x 4 |
|
CACHE JUMPER CONFIGURATION |
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|
Size |
JP5 |
JP6 |
JP7 |
JP8 |
JP22 |
|
64KB |
Open |
Open |
2 & 3 |
2 & 3 |
Open |
|
256KB |
Closed |
Closed |
1 & 2 |
1 & 2 |
Closed |
|
Note: Pins designated should be in the closed position. |
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CPU TYPE CONFIGURATION |
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|
Type |
JP9 |
JP10 |
JP15 |
JP16 |
|
80486SX |
pins 1 & 2 closed |
Closed |
pins 1 & 2 closed |
Open |
|
80486SX + 80487SX |
pins 1 & 2 closed |
Closed |
pins 1 & 2 closed |
Open |
|
80486DX |
pins 1 & 2 closed |
Closed |
pins 2 & 3 closed |
Closed |
|
NPU JUMPER CONFIGURATION |
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|
Type |
JP17 |
JP18 |
JP19 |
JP20 |
|
80487SX |
Open |
Open |
Open |
Open |
|
4167 |
Closed |
Closed |
Closed |
Closed |
|
Note: In order to use the Weitek 4167, a daughter board must be installed in the CPU socket. You would then insert the NPU and CPU into the daughter board. |
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