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 |