JC INFORMATION SYSTEMS CORPORATION
MODEL 2020
Processor | 80386DX |
Processor Speed | 25/33MHz |
Chip Set | C & T PEAK/DM |
Max. Onboard DRAM | 32MB |
Cache | 64KB |
BIOS | C & T/Phoenix |
Dimensions | 330mm x 218mm |
I/O Options | 32-bit external memory card slot |
NPU Options | 80387 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | J4 | Speaker | SPK |
Power LED & keylock | KEYL | Self test | TEST |
Reset switch | RSW | Turbo LED | TLED |
32-bit external memory card | S1 | Turbo switch | TSW |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Factory configured - do not alter | W2 | open |
» | Factory configured - do not alter | W3 | pins 1 & 2 closed |
» | Factory configured - do not alter | W6 | closed |
» | Factory configured - do not alter | W9 | pins 2 & 3 closed |
» | CMOS memory normal operation | W10 | pins 2 & 3 closed |
CMOS memory clear | W10 | pins 1 & 2 closed | |
» | Monitor type select color | W11 | closed |
Monitor type select monochrome | W11 | open | |
Note:The locations of W2, W3, W6, and W9 are unknown. |
DRAM CONFIGURATION | |||
Size | Bank 0 | Bank 1 | W4 |
1MB | (4) 256K x 9 | NONE | pins 1 & 2 closed |
2MB | (4) 256K x 9 | (4) 256K x 9 | pins 1 & 2 closed |
4MB | (4) 1M x 9 | NONE | pins 1 & 2 closed |
5MB | (4) 1M x 9 | (4) 256K x 9 | pins 2 & 3 closed |
8MB | (4) 1M x 9 | (4) 1M x 9 | pins 1 & 2 closed |
16MB | (4) 4M x 9 | NONE | pins 1 & 2 closed |
32MB | (4) 4M x 9 | (4) 4M x 9 | pins 1 & 2 closed |
CACHE CONFIGURATION | |||
Size | Cache CACHE | Location | TAG |
64KB | (8) 8K x 8 | CACHE | (2) 16K x 1 |