486SX-20/25UNB AIO Motherboard Settings and Configuration
DIAMOND FLOWER, INC.
486SX-20/25UNB AIO
Processor | 80486SX/80487SX |
Processor Speed | 20/25MHz |
Chip Set | UMC |
Max. onboard DRAM | 16MB |
Cache | None |
BIOS | AMI |
Dimensions | 330mm x 218mm |
I/O Options | Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial port (2), VGA feature connector, VGA port |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
IDE interface | CN1 | Turbo switch | J3 & J8 |
Floppy drive interface | CN2 | Reset switch | J4 & J9 |
VGA feature connector | CN3 | IDE interface LED | J5 |
VGA port | CN4 | Power LED & keylock | J6 |
Parallel port | CN5 | Speaker | J7 |
Bus mouse port | CN6 | External battery | J10 |
Serial port (COM1) | CN7 | Serial port (COM2) | JP31 |
Keyboard connector | J1 | Keyboard connector | KBD1 |
Turbo LED | J2 | Riser card | S1 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Battery select internal | J11 | pins 2 & 3 closed |
| Battery select external | J11 | pins 1 & 2 closed |
» | Speaker select internal | JP1 | Closed |
| Speaker select external | JP1 | Open |
» | Factory configured - do not alter | JP4 | Open |
» | Factory configured - do not alter | JP5 | pins 2 & 3 closed |
| CPU speed select 20MHz | JP6 | Closed |
| CPU speed select 25MHz | JP6 | Open |
» | Factory configured - do not alter | JP7 | Open |
» | BIOS type select 27C256 (32KB) | JP8 | pins 2 & 3 closed |
| BIOS type select 27C512 (64KB) | JP8 | pins 1 & 2 closed |
» | Factory configured - do not alter | JP10 | Open |
» | Monitor type select color | JP11 | Closed |
| Monitor type select monochrome | JP11 | Open |
» | Factory configured - do not alter | JP13 | Open |
» | Factory configured - do not alter | JP14 | Closed |
» | Floppy drive interface enabled | JP20 | pins 1 & 2 closed |
| Floppy drive interface disabled | JP20 | pins 2 & 3 closed |
» | Factory configured - do not alter | JP21 | pins 1 & 2 closed |
» | IDE interface enabled | JP22 | pins 1 & 2 closed |
| IDE interface disabled | JP22 | pins 2 & 3 closed |
DRAM CONFIGURATION | ||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
1MB | (1) 256K x 36 | NONE | NONE | NONE |
2MB | (1) 256K x 36 | (1) 256K x 36 | NONE | NONE |
3MB | (1) 256K x 36 | (1) 256K x 36 | (1) 256K x 36 | NONE |
4MB | (1) 256K x 36 | (1) 256K x 36 | (1) 256K x 36 | (1) 256K x 36 |
4MB | (1) 1M x 36 | NONE | NONE | NONE |
5MB | (1) 256K x 36 | (1) 1M x 36 | NONE | NONE |
6MB | (1) 256K x 36 | (1) 256K x 36 | (1) 1M x 36 | NONE |
8MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE |
9MB | (1) 256K x 36 | (1) 1M x 36 | (1) 1M x 36 | NONE |
10MB | (1) 256K x 36 | (1) 256K x 36 | (1) 1M x 36 | (1) 1M x 36 |
12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 | NONE |
16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 |
SERIAL PORT CONFIGURATION | |||||
Port 1 (C2) | Port 2 (C1) | JP17 | JP18 | JP19 | |
» | COM1 | COM2 | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed |
| COM1 | Disabled | pins 1 & 2 closed | pins 2 & 3 closed | pins 1 & 2 closed |
| Disabled | COM2 | pins 2 & 3 closed | pins 1 & 2 closed | pins 1 & 2 closed |
| `COM2 | Disabled | pins 1 & 2 closed | pins 2 & 3 closed | pins 2 & 3 closed |
| COM2 | COM1 | pins 1 & 2 closed | pins 1 & 2 closed | pins 2 & 3 closed |
| Disabled | COM1 | pins 2 & 3 closed | pins 1 & 2 closed | pins 2 & 3 closed |
| Disabled | Disabled | pins 2 & 3 closed | pins 2 & 3 closed | Open |
SERIAL PORTS 1 & 2 NORMAL/FORCED TRUE CONFIGURATION | ||||
Port 1 (CN7) | Port 2 (JP31) | JP24 | JP25 | JP26 |
Normal | Normal | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed |
Forced true | Forced true | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |
SERIAL PORT DTE/DCE CONFIGURATION | ||
Function | JP30 | |
» | Serial Port 1 (CN7) DTE | Pins 1 & 2, 3 & 4, and 5 & 6 closed |
| Serial Port 1 (CN7)DCE | Pins 1 & 3, 2 & 4, and 6 & 8 closed |
SERIAL PORT DTE/DCE CONFIGURATION | ||
Function | JP23 | |
» | Serial Port 2 (JP23) DTE | Pins 7 & 8 and 9 & 10 closed |
| Serial Port 2 (JP23) DCE | Pins 5 & 7 and 9 & 10 closed |
PARALLEL PORT 1 (CN5) CONFIGURATION | |||||
LPT | I/O Address | Interrupt | JP9 | JP15 | JP16 |
LPT 1 | 3BC-3BEh | IRQ7 | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
LPT 2 | 378-37Ah | IRQ7 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
LPT 3 | 278-27Ah | IRQ5 | pins 2 & 3 | pins 1 & 2 | pins 2 & 3 |
Disabled | N/A | N/A | N/A | pins 2 & 3 | pins 2 & 3 |
Note:Pins designated should be in the closed position. | |||||
VRAM CONFIGURATION | ||
Size | VRAM | Location |
512KB | (4) 44256 | Bank 0 |
1024KB | (8) 44256 | Bank 0 & 1 |
ONBOARD VGA CONFIGURATION | |||||
Mode | IRQ | JP2 | JP3 | JP12 | |
» | Enabled | 2/9 | pins 2 & 3 closed | pins 1 & 2 closed | Closed |
| Disabled | 2/9 | Closed | Open | Open |
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