MSI/MDI486 System Board Motherboard Settings and Configuration
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 |
My Books
