A351 386SX Motherboard Settings and Configuration
UNIDENTIFIED
A351 386SX
Processor | 80386SX |
Processor Speed | 16/20MHz |
Chip Set | UMC |
Max. onboard DRAM | 4MB |
Cache | None |
BIOS | AMI |
Dimensions | 330mm x 220mm |
I/O Options | Floppy drive interface, game port, IDE interface, parallel port, serial ports (2), VGA feature connector |
NPU Options | 80387SX |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | J1 | Floppy drive interface | P2 |
Speaker | J2 | IDE interface | P3 |
Power LED & keylock | J3 | VGA feature connector | P4 |
Turbo switch | J4 | Serial port 2 | Unknown |
Reset switch | J5 | Serial port 1 | Unknown |
IDE interface LED | J6 | Parallel port | Unknown |
Turbo LED | J7 | Game port | Unknown |
Note:J4 might not be available on future boards. | |||
USER CONFIGURABLE SETTINGS | |||
Function | Jumper/Switch | Position | |
| » | Onboard VGA enabled | JP2 | pins 1 & 2 closed |
Onboard VGA disabled | JP2 | pins 2 & 3 closed | |
| » | Monitor type select CGA | JP3 | Closed |
Monitor type select monochrome | JP3 | Open | |
| » | Factory configured - do not alter | JP4 | Open |
| » | Battery select internal | JP5 | Closed |
Battery select 6V external | JP5 | Open | |
| » | Monitor type select color | SW1/3 | Off |
Monitor type select monochrome | SW1/3 | On | |
| » | Floppy drive interface (P2) enabled | SW1/4 | Off |
Floppy drive interface (P2) disabled | SW1/4 | On | |
| » | Parallel port select LPT1 (378-37Fh) | SW1/5 | Off |
Parallel port select LPT2 (278-27Fh) | SW1/5 | On | |
| » | IDE interface (P3) enabled | SW1/6 | Off |
IDE interface (P3) disabled | SW1/6 | On | |
| » | Game port enabled | SW1/7 | Off |
Game port disabled | SW1/7 | On | |
| » | NPU synchronous with CPU | SW1/8 | Off |
NPU asynchronous with CPU | SW1/8 | On | |
| » | CMOS memory normal operation | P1 | Open |
CMOS memory clear | P1 | Closed | |
Note: If an EGA or VGA monitor is installed, JP3 can be on either setting. | |||
DRAM CONFIGURATION | ||
Size | Bank 0 | Bank 1 |
512KB | (2) 256K x 9 | None |
1MB | (2) 256K x 9 | (2) 256K x 9 |
2MB | (2) 1M x 9 | None |
4MB | (2) 1M x 9 | (2) 1M x 9 |
MONITOR TYPE CONFIGURATION | |||||
MonitorType | SW2/1 | SW2/2 | SW2/3 | SW2/4 | SW2/5 |
CGA | On | On | On | On | On |
MDA | Off | On | On | On | On |
Pure MDA (no emulation) | On | Off | On | On | On |
EGA | Off | Off | On | On | On |
Pure EGA (no emulation) | On | On | Off | On | On |
VGA Color | Off | On | Off | On | On |
VGA Mono | On | Off | Off | On | On |
8514 | Off | Off | Off | On | On |
NEC 2A (640 x 480) | On | On | On | Off | On |
NEC/NEC+ (multifrequency) | Off | On | On | Off | On |
NEC XL (1024 x 768) | On | Off | On | Off | On |
NEC 3D (1024 x 768) | Off | Off | On | Off | On |
NEC4D/NEC5D (1024 x 768) | On | On | Off | Off | On |
Portrait | Off | On | Off | Off | On |
Note:SW2/5 on = interlaced display. For non-interlaced display this setting should be in the Off position. | |||||
SERIAL PORT CONFIGURATION | |||
Serial port 1 | Serial port 2 | SW1/switch 2 | SW1/switch 2 |
COM1 | COM2 | Off | Off |
COM1 | Disabled | Off | Off |
Disabled | COM2 | On | On |
Disabled | Disabled | On | On |
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