JC INFORMATION SYSTEMS CORPORATION
HIGH PERFORMANCE 486 SX/DX (MODEL 2270)
|
Processor |
80486SX/80486DX/80486DX2 |
|
Processor Speed |
25/33/40/50/50(internal)/66(internal)MHz |
|
Chip Set |
Unidentified |
|
Video Chip Set |
None |
|
Maximum Onboard Memory |
64MB |
|
Maximum Video Memory |
None |
|
Cache |
64/256KB |
|
BIOS |
AMI |
|
Dimensions |
254mm x 218mm |
|
I/O Options |
32-bit VESA local bus slots (2) |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
External battery |
J1 |
Turbo LED |
JP20 |
|
Power LED & keylock |
J20 |
Reset switch |
S1 |
|
Speaker |
JP9 |
32-bit VESA local bus slots |
SL1 & SL2 |
|
Turbo switch |
JP19 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Label |
Position | |
|
» |
CMOS memory normal operation |
JP1 |
Pins 2 & 3 closed |
|
CMOS memory clear |
JP1 |
Pins 1 & 2 closed | |
|
External battery installed at J1 |
JP1 |
Open | |
|
Monitor type select monochrome/EGA |
JP2 |
Open | |
|
Monitor type select CGA |
JP2 |
Closed | |
|
» |
Factory configured - do not alter |
JP10 |
Closed |
|
Jumper information unavailable |
JP11 |
Unidentified | |
|
Jumper information unavailable |
JP12 |
Unidentified | |
|
» |
Factory configured - do not alter |
JP21 |
Open |
|
» |
Factory configured - do not alter |
JP22 |
Open |
|
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) 1M x 9 |
(4) 256K x 9 |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
|
16MB |
(4) 4M x 9 |
None |
|
20MB |
(4) 4M x 9 |
(4) 1M x 9 |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
|
64MB |
(4) 16M x 9 |
None |
|
CACHE CONFIGURATION | ||
|
Size |
Bank 0 |
Bank 1 |
|
64KB |
(4) 8K x 8 |
(4) 8K x 8 |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
|
Note: The location of banks 0 & 1 are unidentified. | ||
|
CACHE JUMPER CONFIGURATION | ||||
|
Size |
JP3 |
JP4 |
JP17 |
JP18 |
|
64KB |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Open |
Open |
|
128KB |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
Closed |
Open |
|
256KB |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Closed |
Closed |
|
CPU SPEED SELECTION | |||
|
Speed |
JP5 |
JP6 |
JP7 |
|
25MHz |
Open |
Open |
Closed |
|
33MHz |
Closed |
Open |
Open |
|
40MHz |
Closed |
Closed |
Open |
|
50iMHz |
Open |
Open |
Closed |
|
50MHz |
Open |
Closed |
Open |
|
66iMHz |
Closed |
Open |
Open |
|
CPU TYPE SELECTION | |||||
|
Type |
JP8 |
JP13 |
JP14 |
JP15 |
JP16 |
|
80486SX |
2 & 3 |
Open |
2 & 3 |
Open |
Open |
|
80486DX |
2 & 3 |
1 & 2 |
1 & 2 |
Closed |
Open |
|
Note: Pins designated should be in the closed position. If PQFP is installed, JP8 must be set to 1 & 2 and JP16 must be closed if an 80486DX or 80486DX2 is installed | |||||