ABC A3875
ABC COMPUTER COMPANY, LTD.
A3875
| Processor |
80386DX |
| Processor Speed |
25/33/40MHz |
| Chip Set |
Forex |
| Max. Onboard DRAM |
32MB |
| Cache |
32/64/128KB |
| BIOS |
AMI |
| Dimensions |
332mm x 218mm |
| I/O Options |
None |
| NPU Options |
80387/3167 |
| CONNECTIONS | |||
| Purpose | Location | Purpose | Location |
|
External battery |
J3 |
Turbo switch |
J10 |
|
Reset switch |
J8 |
Speaker |
J11 |
|
Turbo LED |
J9 |
Power LED & keylock |
J12 |
| USER CONFIGURABLE SETTINGS | |||
| Function | Jumper | Position | |
| � | Monitor type select color |
J1 |
Closed |
|
Monitor type select monochrome |
J1 |
Open | |
| � | External battery select 3.6VDC |
J4 |
Closed |
|
External battery select 6VDC |
J4 |
Open | |
| � | CMOS memory normal operation |
J5 |
Open |
|
CMOS memory clear |
J5 |
Closed | |
| � | NPU mode select synchronous with CPU |
J6 |
pins 1 & 2 closed |
|
NPU mode select asynchronous with CPU |
J6 |
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) 256K x 9 |
(4) 1M x 9 |
|
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 (U41) | TAG (U42) |
|
32KB |
(4) 8K x 8 |
NONE |
(1) 8K x 8 |
NONE |
|
64KB |
(4) 8K x 8 |
(4) 8K x 8 |
(2) 8K x 8 |
(2) 8K x 8 |
|
128KB |
(4) 32K x 8 |
NONE |
(1) 32K x 8 |
NONE |
|
Note: Bank 0 = U44, U46, U48 & U50 | ||||
| CACHE JUMPER CONFIGURATION | |
| Size | J7 |
|
32KB |
pins 1 & 2 closed |
|
64KB |
pins 2 & 3 closed |
|
128KB |
pins 2 & 3 closed |
