PC BRAND
486/25C CACHE MAINBOARD
(MYSTERY MACHINE)
|
Processor |
80486SX |
|
Processor Speed |
25MHz |
|
Chip Set |
OPTI |
|
Max. Onboard DRAM |
16MB |
|
Cache |
128KB (on external cache card) |
|
BIOS |
AMI |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
External cache card |
|
NPU Options |
4167 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
External battery |
J1 |
Turbo switch |
J9 |
|
Power LED & keylock |
J6 |
Turbo LED |
J10 |
|
Speaker |
J7 |
External cache slot |
SL1 |
|
Reset switch |
J8 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
|
Battery type select internal |
J1 |
pins 2 & 3 closed |
|
Battery type select external |
J1 |
Closed | |
|
|
Monitor type select monochrome |
J2 |
Open |
|
Monitor type select color |
J2 |
Closed | |
|
|
Factory configured - do not alter |
J3 |
N/A |
|
DRAM CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
1MB |
(4) 256K x 9 |
NONE |
NONE |
NONE |
|
2MB |
(4) 256K x 9 |
(4) 256K x 9 |
NONE |
NONE |
|
3MB |
(4) 256K x 9 |
(4) 256K x 9 |
(4) 256K x 9 |
NONE |
|
4MB |
(4) 256K x 9 |
(4) 256K x 9 |
(4) 256K x 9 |
(4) 256K x 9 |
|
4MB |
(4) 1M x 9 |
NONE |
NONE |
NONE |
|
5MB |
(4) 256K x 9 |
(4) 1M x 9 |
NONE |
NONE |
|
5MB |
(4) 1M x 9 |
(4) 256K x 9 |
NONE |
NONE |
|
6MB |
(4) 256K x 9 |
(4) 256K x 9 |
(4) 1M x 9 |
NONE |
|
6MB |
(4) 256K x 9 |
(4) 1M x 9 |
(4) 256K x 9 |
NONE |
|
6MB |
(4) 1M x 9 |
(4) 256K x 9 |
(4) 256K x 9 |
NONE |
|
7MB |
(4) 256K x 9 |
(4) 256K x 9 |
(4) 1M x 9 |
(4) 256K x 9 |
|
7MB |
(4) 256K x 9 |
(4) 1M x 9 |
(4) 256K x 9 |
(4) 256K x 9 |
|
7MB |
(4) 1M x 9 |
(4) 256K x 9 |
(4) 256K x 9 |
(4) 256K x 9 |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
NONE |
NONE |
|
9MB |
(4) 256K x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
NONE |
|
9MB |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 256K x 9 |
NONE |
|
9MB |
(4) 1M x 9 |
(4) 256K x 9 |
(4) 1M x 9 |
NONE |
|
10MB |
(4) 256K x 9 |
(4) 256K x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
|
10MB |
(4) 256K x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 256K x 9 |
|
10MB |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 256K x 9 |
(4) 256K x 9 |
|
10MB |
(4) 1M x 9 |
(4) 256K x 9 |
(4) 1M x 9 |
(4) 256K x 9 |
|
12MB |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
NONE |
|
13MB |
(4) 256K x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
|
13MB |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 256K x 9 |
|
13MB |
(4) 1M x 9 |
(4) 256K x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
|
16MB |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
|
CACHE CONFIGURATION | |
|
Size |
SL1 |
|
128KB |
Card installed |
|
CACHE JUMPER CONFIGURATION | ||
|
Setting |
J4 |
J5 |
|
Cache mode |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
Burst mode |
pins 2 & 3 closed |
pins 2 & 3 closed |