ABIT COMPUTER CORPORATION
AS420/AS425/AS433/AS455
|
Processor |
80486SX/80486DX |
|
Processor Speed |
20/25/33/40MHz |
|
Chip Set |
SIS |
|
Max. Onboard DRAM |
32MB |
|
Cache |
32/64/128/256/512/1024KB |
|
BIOS |
AMI |
|
Dimensions |
330mm x 214mm |
|
I/O Options |
None |
|
NPU Options |
4167 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Turbo LED |
D6 |
Reset |
JP20 |
|
External battery |
JP15 |
Speaker |
JP21 |
|
Turbo switch |
JP19 |
Power LED & keylock |
JP22 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
| » |
Factory configured - do not alter |
JP2 |
Open |
| » |
Monitor type select monochrome |
JP4 |
Open |
|
Monitor type select color |
JP4 |
Closed | |
| » |
CMOS memory normal operation |
JP5 |
pins 1 & 2 closed |
|
CMOS memory clear |
JP5 |
pins 2 & 3 closed | |
| » |
Factory configured - do not alter |
JP6 |
pins 1 & 2 closed |
| » |
Factory configured - do not alter |
JP8 |
pins 1 & 2 closed |
| » |
Factory configured - do not alter |
JP14 |
pins 1 & 2 closed |
| » |
Factory configured - do not alter |
JP17 |
pins 1 & 2 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 |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
|
16MB |
(4) 4M x 9 |
NONE |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
|
CACHE CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
TAG (U28 & U29) |
TAG (U30) |
|
32KB |
(4) 8K x 8 |
NONE |
(2) 16K x 4 |
NONE |
|
32KB |
(4) 8K x 8 |
NONE |
NONE |
(1) 8K x 8 |
|
64KB |
(4) 8K x 8 |
(4) 8K x 8 |
(2) 16K x 4 |
NONE |
|
64KB |
(4) 8K x 8 |
(4) 8K x 8 |
NONE |
(1) 8K x 8 |
|
128KB |
(4) 32K x 8 |
NONE |
(2) 64K x 4 |
NONE |
|
128KB |
(4) 32K x 8 |
NONE |
NONE |
(1) 32K x 8 |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
(2) 16K x 4 |
NONE |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
NONE |
(1) 32K x 8 |
|
512KB |
(4) 128K x 8 |
NONE |
NONE |
(1) 128K x 8 |
|
1024KB |
(4) 128K x 8 |
(4) 128K x 8 |
(2) 64K x 4 |
NONE |
|
1024KB |
(4) 128K x 8 |
(4) 128K x 8 |
NONE |
(1) 128K x 8 |
|
CACHE JUMPER CONFIGURATION | ||||||
|
Size |
JP28 |
JP30 |
JP31 |
JPX1/JPX2 |
JPX3 |
JPX4 |
|
32KB |
2 & 3 |
Open |
Closed |
1 - 8 |
Open |
1 - 16 |
|
64KB |
1 & 2 |
Closed |
Open |
1 - 8 |
1 - 16 |
Open |
|
128KB |
1 & 2 |
Closed |
Closed |
3 - 10 |
1 - 16 |
Open |
|
256KB |
1 & 2 |
Closed |
Open |
5 - 12 |
1 - 16 |
Open |
|
512KB |
1 & 2 |
Closed |
Open |
7 - 14 |
Open |
1 - 16 |
|
1024KB |
1 & 2 |
Closed |
Closed |
9 - 18 |
1 - 16 |
Open |
|
Note: Jumpers JPX1-JPX4 are closed using one or two 8-pin terminating resistors. | ||||||
|
CPU TYPE CONFIGURATION | ||
|
Type |
JP25 |
JPX5 |
|
80486SX |
Closed |
Open |
|
80486DX |
Open |
Closed |