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 |