MYLEX CORPORATION
MSI/MDI486 System Board
|
Processor |
80486SX/80487SX/80486DX |
|
Processor Speed |
20/25/33MHz |
|
Chip Set |
OPTI |
|
Max. Onboard DRAM |
32MB |
|
Cache |
64/256KB |
|
BIOS |
Mylex |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
Floppy drive interface, IDE interface, parallel port, serial ports (2) |
|
NPU Options |
4167 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
External battery |
BAT |
Turbo LED |
JP3 |
|
Serial port 2 |
COM2 |
Reset switch |
JP4 |
|
Serial port 1 |
COM1 |
Speaker |
JP5 |
|
Floppy drive interface |
FDD |
IDE interface LED |
JP6 |
|
IDE interface |
IDE |
Parallel port |
LPT |
|
Power LED & keylock |
JP2 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
Monitor type select color |
JP1 |
Closed | |
|
Monitor type select monochrome |
JP1 |
Open | |
|
Parallel port select LPT1 interrupt IRQ7 |
JP19 |
pins 2 & 3 closed | |
|
Parallel port select LPT2 interrupt IRQ5 |
JP19 |
pins 1 & 2 closed | |
|
On-board interface ports enabled |
JP20 |
pins 1 & 2 closed | |
|
On-board interface ports disabled |
JP20 |
pins 2 & 3 closed | |
|
Battery type select internal |
JP21 |
pins 2 & 3 closed | |
|
Battery type select external |
JP21 |
Open | |
|
CMOS memory clear |
JP21 |
pins 1 & 2 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) 1M x 9 |
(4) 256K x 9 |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
|
16MB |
(4) 4M x 9 |
NONE |
|
17MB |
(4) 4M x 9 |
(4) 256K x 9 |
|
20MB |
(4) 4M x 9 |
(4) 1M x 9 |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
|
CACHE CONFIGURATION | |||
|
Size |
Bank 0 |
TAG (U19) |
TAG (U20) |
|
64KB |
(8) 8K x 8 |
(1) 8K x 8 |
(1) 64K x 1 |
|
256KB |
(8) 32K x 8 |
(1) 32K x 8 |
(1) 64K x 1 |
|
CACHE JUMPER CONFIGURATION | ||||
|
Size |
JP7 |
JP11 |
JP12 |
JP13 |
|
64KB |
Open |
Open |
Open |
Open |
|
256KB |
Closed |
Closed |
Open |
Closed |
|
CPU TYPE CONFIGURATION | |||
|
Type |
JP8 |
JP9 |
JP10 |
|
80486SX |
Open |
pins 2 & 3 closed |
Open |
|
80487SX |
pins 2 & 3 closed |
pins 1 & 2 closed |
Closed |
|
80486DX |
pins 1 & 2 closed |
pins 1 & 2 closed |
Closed |
|
CPU SPEED CONFIGURATION | ||||
|
Speed |
JP14 |
JP15 |
JP16 |
JP17 |
|
20MHz |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 1 & 2 closed |
|
25MHz |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
33MHz |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |