ABC COMPUTER COMPANY, LTD.
A4879
|
Processor |
80486SX/80487SX/80486DX |
|
Processor Speed |
25/50MHz |
|
Chip Set |
UMC |
|
Max. Onboard DRAM |
64MB |
|
SRAM Cache |
64/128/256KB |
|
BIOS |
AMI |
|
Dimensions |
220mm x 330mm |
|
I/O Options |
None |
|
NPU Options |
4167 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Power LED & keylock |
J1 |
Reset switch |
J4 |
|
Speaker |
J2 |
Turbo LED |
J5 |
|
Turbo switch |
J3 |
External battery |
J6 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
Monitor type select color |
W18 |
closed | |
|
Monitor type select monochrome |
W18 |
open | |
|
Battery type select internal |
W22 |
closed | |
|
Battery type select external |
W22 |
open | |
|
SRAM JUMPER CONFIGURATION | |||
|
Jumper |
64KB |
128KB |
256KB |
|
W2 |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
W3 |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
W4 |
open |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
W5 |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
W6 |
open |
closed |
closed |
|
W7 |
open |
open |
closed |
|
W8 |
open |
open |
closed |
|
W9 |
open |
closed |
closed |
|
SRAM CONFIGURATION | ||||
|
Size |
Cache SRAM |
Location |
TAG (U10) |
TAG (U11) |
|
64KB |
(8) 8K x 8 |
Banks 0 & 1 |
(1) 16K x 4 |
(1) 8K x 8 |
|
128KB |
(4) 32K x 8 |
Bank 0 |
(1) 16K x 4 |
(1) 32K x 8 |
|
256KB |
(8) 32K x 8 |
Banks 0 & 1 |
(1) 16K x 4 |
(1) 32K x 8 |
|
CPU JUMPER CONFIGURATION | |||
|
CPU |
Jumper W10 |
Jumper W11 |
Jumper W14 |
|
80486DX |
pins 1 & 2 closed |
pins 1 & 2 and 3 & 4 closed |
open |
|
80487SX |
pins 2 & 3 closed |
pins 1 & 2 and 3 & 4 closed |
closed |
|
80486SX |
open |
pins 2 & 3 closed |
closed |
|
Note:The location of W14 is unknown. | |||
|
DRAM CONFIGURATION | |||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
Jumpers W12,W13,W15,W16 |
|
1MB |
(4) 256K x 9 |
NONE |
NONE |
NONE |
pins 1 & 2 closed |
|
1MB |
NONE |
NONE |
(1) 256K x 36 |
NONE |
pins 2 & 3 closed |
|
2MB |
(4) 256K x 9 |
(4) 256K x 9 |
NONE |
NONE |
pins 1 & 2 closed |
|
2MB |
NONE |
NONE |
(1) 256K x 36 |
(1) 256K x 36 |
pins 2 & 3 closed |
|
3MB |
(4) 256K x 9 |
(4) 256K x 9 |
(1) 256K x 36 |
NONE |
pins 1 & 2 closed |
|
4MB |
(4) 256K x 9 |
(4) 256K x 9 |
(1) 256K x 36 |
(1) 256K x 36 |
pins 1 & 2 closed |
|
4MB |
(4) 1M x 9 |
NONE |
NONE |
NONE |
pins 1 & 2 closed |
|
4MB |
NONE |
NONE |
(1) 1M x 36 |
NONE |
pins 2 & 3 closed |
|
5MB |
(4) 256K x 9 |
(4) 1M x 9 |
NONE |
NONE |
pins 1 & 2 closed |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
NONE |
NONE |
pins 1 & 2 closed |
|
8MB |
NONE |
NONE |
(1) 1M x 36 |
(1) 1M x 36 |
pins 2 & 3 closed |
|
12MB |
(4) 1M x 9 |
(4) 1M x 9 |
(1) 1M x 36 |
NONE |
pins 1 & 2 closed |
|
16MB |
(4) 1M x 9 |
(4) 1M x 9 |
(1) 1M x 36 |
(1) 1M x 36 |
pins 1 & 2 closed |
|
16MB |
(4) 4M x 9 |
NONE |
NONE |
NONE |
pins 1 & 2 closed |
|
16MB |
NONE |
NONE |
(1) 4M x 36 |
NONE |
pins 2 & 3 closed |
|
20MB |
(4) 1M x 9 |
(4) 4M x 9 |
NONE |
NONE |
pins 1 & 2 closed |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
NONE |
NONE |
pins 1 & 2 closed |
|
32MB |
NONE |
NONE |
(1) 4M x 36 |
(1) 4M x 36 |
pins 2 & 3 closed |
|
48MB |
(4) 4M x 9 |
(4) 4M x 9 |
(1) 4M x 36 |
NONE |
pins 1 & 2 closed |
|
64MB |
(4) 4M x 9 |
(4) 4M x 9 |
(1) 4M x 36 |
(1) 4M x 36 |
pins 1 & 2 closed |
|
Note:The locations of jumpers W12, W13, W15,and W16 are unknown. | |||||