ISA/EISA, INC.
486B
|
Processor |
80486SX/80487SX/80486DX |
|
Processor Speed |
20/33MHz |
|
Chip Set |
OPTI |
|
Max. Onboard DRAM |
32MB |
|
SRAM Cache |
64/256KB |
|
BIOS |
AMI |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
None |
|
NPU Options |
4167 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Power LED & keylock |
J1 |
Turbo switch |
JP2 |
|
Speaker |
J3 |
Turbo LED |
JP21 |
|
External battery |
J4 |
Cooling fan switch |
JP25 |
|
Reset switch |
JP1 |
Cooling fan power |
USP8 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
Factory configured - do not alter |
JP10 |
unknown | |
|
CPU speed select switchable at keyboard |
JP12 |
pins 1 & 2 closed | |
|
CPU speed select switchable at turbo switch |
JP12 |
pins 2 & 3 closed | |
|
Factory configured - do not alter |
JP26 |
open | |
|
Video BIOS shadow before initialization |
JP27 |
pins 1 & 2 closed | |
|
Video BIOS shadow after initialization |
JP27 |
pins 2 & 3 closed | |
|
CPU JUMPER CONFIGURATION | |||
|
CPU |
JP22 |
JP23 |
JP24 |
|
80486DX (33MHz) |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2 and 3 & 4 closed |
|
80487SX (20MHz) |
pins 3 & 4 closed |
pins 2 & 3 closed |
pins 1 & 2 and 3 & 4 closed |
|
80486SX (20MHz) |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
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 |
|
17MB |
(4) 4M x 9 |
(4) 256K x 9 |
|
20MB |
(4) 1M x 9 |
(4) 4M x 9 |
|
20MB |
(4) 4M x 9 |
(4) 1M x 9 |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
|
SRAM JUMPER CONFIGURATION | |||||
|
Size |
JP6 |
JP7 |
JP8 |
JP9 |
JP20 |
|
64KB |
pins 1 & 2 |
pins 1 & 2 |
pins 1 & 2 |
pins 1 & 2 |
pins 1 & 2 |
|
256KB |
pins 2 & 3 |
pins 2 & 3 |
pins 2 & 3 |
pins 2 & 3 |
pins 1 & 2 |
|
Disabled |
N/A |
N/A |
N/A |
N/A |
pins 2 & 3 |
|
Note:Pins designated should be in the closed position. | |||||
|
SRAM CONFIGURATION | ||
|
Size |
Cache SRAM |
TAG |
|
64KB |
(8) 8K x 8 |
(1) 8K x 8 |
|
256KB |
(8) 32K x 8 |
(1) 32K x 8 |
|
I/O BUS SPEED JUMPER CONFIGURATION | ||||||
|
Bus Speed |
JP3 |
JP4 |
JP5 |
JP13 |
JP14 |
JP15 |
|
CPU/8 |
open |
open |
open |
open |
open |
closed |
|
CPU/6 |
open |
open |
open |
open |
closed |
open |
|
CPU/5 |
open |
open |
open |
closed |
open |
open |
|
CPU/4 |
open |
open |
closed |
open |
open |
open |
|
CPU/3 |
open |
closed |
open |
open |
open |
open |
|
CPU/2 |
closed |
open |
open |
open |
open |
open |