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
|