JET-486 CACHE 486-33/486SX-25 Motherboard Settings and Configuration
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 |
CONNECTIONS | |||
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 | |||
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 | ||
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 | |||
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 | |||||
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. | |||||
CPU TYPE CONFIGURATION | ||||
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 | ||||
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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