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 |