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
|