J-BOND COMPUTER SYSTEMS CORPORATION
486 VL450C-1
Processor | 80486SX/80486DX/80486DX2 |
Processor Speed | 20/25/33/40(internal)/50(internal)/50/66(internal)MHz |
Chip Set | SIS |
Max. Onboard DRAM | 32MB |
Cache | 64/128/256KB |
BIOS | AMI |
Dimensions | 230mm 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 | J5 |
Power LED & keylock | J2 | Reset switch | J6 |
Speaker | J3 | 32-bit VESA Local bus slots | SL1 & SL2 |
Turbo switch | J4 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Factory configured - do not alter | J7 | Open |
» | A20 type select fast gate | JP2 | pins 1 & 2 closed |
A20 type select keyboard controller gate | JP2 | pins 2 & 3 closed | |
» | CMOS memory normal operation | JP3 | Open |
CMOS memory clear | JP3 | pins 2 & 3 closed | |
» | VESA local bus normal operation | JP27 | pins 1 & 2 closed |
VESA local bus compatibility problems (See note below) | JP27 | pins 2 & 3 closed | |
» | PQFP CPU enabled | JSX6 | Open |
PQFP CPU disabled | JSX6 | Closed | |
Note: If compatibility problems arise with nonstandard VESA local bus peripherals, jumper pins 2 & 3. |
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 |
8MB | (4) 1M x 9 | (4) 1M x 9 |
16MB | (4) 4M x 9 | NONE |
20MB | (4) 1M x 9 | (4) 4M x 9 |
32MB | (4) 4M x 9 | (4) 4M x 9 |
CACHE CONFIGURATION | |||
Size | Bank 0 | Bank 1 | TAG |
64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 or (1) 32K x 8 |
128KB | (4) 32K x 8 | NONE | (1) 8K x 8 or (1) 32K x 8 |
256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
CACHE JUMPER CONFIGURATION | ||||
Size | JP4 | JP5 | JP6 | JP7 |
64KB | Open | Open | Open | Open |
128KB | Closed | pins 1 & 2 closed | Open | Closed |
256KB | Closed | pins 2 & 3 closed | Closed | Closed |
CPU TYPE CONFIGURATION | |||||
Type | JSX1 | JSX2 | JSX3 | JSX4 | JSX5 |
80486SX | Open | Open | Open | Closed | Open |
80487SX | Open | Closed | Closed | Open | Closed |
80486DX/DX2 | Closed | Open | Closed | Open | Closed |
Overdrive | Open | Closed | Closed | Open | Closed |
CPU SPEED CONFIGURATION | |||
Speed | JP20 | JP21 | JP22 |
20MHz | Open | Open | Open |
25MHz | Closed | Open | Open |
33MHz | Closed | Closed | Closed |
40MHz | Closed | Closed | Open |
50iMHz | Closed | Open | Open |
50MHz | Open | Open | Closed |
66iMHz | Closed | Closed | Closed |
VESA WAIT STATE/BUS SPEED CONFIGURATION | |||||
CPU speed | Wait states | JP8 | JP9 | JP10 | JP11 |
< 33MHz | 0 wait states | Open | Open | Open | Open |
> 33MHz | 1 wait state | Short | Short | Short | Short |