AST RESEARCH, INC.
PREMMIA SYSTEM BOARD (P/N202514-00X)
Processor | 80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium |
Processor Speed | 25/33/50(internal)/66(internal)MHz |
Chip Set | ATI |
Max. Onboard DRAM | 128MB |
Cache | 64/256KB (Located on the external cache module) |
BIOS | AST |
Dimensions | 355mm x 304mm |
I/O Options | Cache/Pentium upgrade module, floppy drive interface (2), IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA feature connector, video port |
NPU Options | None |

CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Bus mouse port | J12 | Manufacturer’s test header | J23 |
Parallel port | J13 | Floppy drive interface 1 & 2 | J24 |
Serial port 1 | J14 | Floppy drive interface 3 | J25 |
Personality/feature connector | J15 | External battery | J26 |
Personality/feature connector | J16 | Speaker | J27 |
Pentium/Cache module upgrade | J17 | Chassis fan power | J28 |
SVGA monitor port | J18 | Front console header | J29 |
VGA port | J19 | Manufacturer’s test header | J30 |
Serial port 2 | J20 | IDE interface LED | J35 |
IDE interface | J22 | Personality/feature connector | J46 |
Note:The personality/feature connectors alow various network modules to be added to the system. | |||
USER CONFIGURABLE SETTINGS | |||
Function | Jumper/Switch | Position | |
» | Factory configured - do not alter | E2 | Open |
» | Pariity checking enabled | E3 | Closed |
Pariity checking disabled | E3 | Open | |
» | Flash BIOS voltage 12V | E5 | pins 2 & 3 closed |
Flash BIOS voltage 5V | E5 | pins 1 & 2 open | |
» | VGA enabled | SW1/switch 1 | On |
VGA disabled | SW1/switch 1 | Off | |
» | Factory configured - do not alter | SW1/switch 2 | N/A |
» | CMOS memory normal operation | SW1/switch 3 | Off |
CMOS memory clear | SW1/switch 3 | On | |
» | BIOS normal operation | SW1/switch 4 | Off |
BIOS forced update | SW1/switch 4 | On | |
» | Password override | SW1/switch 5 | Off |
Password inhibited | SW1/switch 5 | On | |
» | Factory configured - do not alter | SW1/switch 6 | Off |
» | Factory configured - do not alter | SW1/switch 7 | Off |
» | Factory configured - do not alter | SW1/switch 8 | Off |
» | Factory configured - do not alter | SW1/switch 9 | Off |
» | Monitor type select color | SW1/switch 10 | On |
Monitor type select monochrome | SW1/switch 10 | Off | |
DRAM CONFIGURATION | ||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
2MB | (1) 1M x 36 | (1) 1M x 36 | NONE | NONE |
4MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 |
4MB | (1) 2M x 36 | (1) 2M x 36 | NONE | NONE |
6MB | (1) 1M x 36 | (1) 1M x 36 | (1) 2M x 36 | (1) 2M x 36 |
8MB | (1) 2M x 36 | (1) 2M x 36 | (1) 2M x 36 | (1) 2M x 36 |
8MB | (1) 4M x 36 | (1) 4M x 36 | NONE | NONE |
10MB | (1) 1M x 36 | (1) 1M x 36 | (1) 4M x 36 | (1) 4M x 36 |
12MB | (1) 2M x 36 | (1) 2M x 36 | (1) 4M x 36 | (1) 4M x 36 |
16MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x 36 |
16MB | (1) 8M x 36 | (1) 8M x 36 | NONE | NONE |
18MB | (1) 1M x 36 | (1) 1M x 36 | (1) 8M x 36 | (1) 8M x 36 |
20MB | (1) 2M x 36 | (1) 2M x 36 | (1) 8M x 36 | (1) 8M x 36 |
24MB | (1) 4M x 36 | (1) 4M x 36 | (1) 8M x 36 | (1) 8M x 36 |
32MB | (1) 8M x 36 | (1) 8M x 36 | (1) 8M x 36 | (1) 8M x 36 |
32MB | (1) 16M x 36 | (1) 16M x 9 | NONE | NONE |
34MB | (1) 1M x 36 | (1) 1M x 36 | (1) 16M x 36 | (1) 16M x 36 |
36MB | (1) 2M x 36 | (1) 2M x 36 | (1) 16M x 36 | (1) 16M x 36 |
40MB | (1) 4M x 36 | (1) 4M x 36 | (1) 16M x 36 | (1) 16M x 36 |
48MB | (1) 8M x 36 | (1) 8M x 36 | (1) 16M x 36 | (1) 16M x 36 |
64MB | (1) 16M x 36 | (1) 16M x 36 | (1) 16M x 36 | (1) 16M x 36 |
64MB | (1) 32M x 36 | (1) 32M x 36 | NONE | NONE |
66MB | (1) 1M x 36 | (1) 1M x 36 | (1) 32M x 36 | (1) 32M x 36 |
68MB | (1) 2M x 36 | (1) 2M x 36 | (1) 32M x 36 | (1) 32M x 36 |
72MB | (1) 4M x 36 | (1) 4M x 36 | (1) 32M x 36 | (1) 32M x 36 |
80MB | (1) 8M x 36 | (1) 8M x 36 | (1) 32M x 36 | (1) 32M x 36 |
96MB | (1) 16M x 36 | (1) 16M x 36 | (1) 32M x 36 | (1) 32M x 36 |
128MB | (1) 32M x 36 | (1) 32M x 36 | (1) 32M x 36 | (1) 32M x 36 |
CPU TYPE CONFIGURATION | ||||||
PQFP | PGA | Pentium | E1 | E4 | E6 | E7 |
80486SX | None | None | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
80486SX | 80487SX | None | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
80486SX | ODP486SX | None | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
80486SX | 80486DX/80486DX2 | None | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
80486DX | None | None | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
80486DX | 80486DX/80486DX2 | None | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
80486DX | ODP486SX | None | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
None | 80486SX | None | Open | Open | pins 2 & 3 | pins 2 & 3 |
None | 80486DX/80486DX2 | None | Open | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 |
None | ODP486SX | None | Open | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
Any | None | Yes | pins 2 & 3 | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
None | None | Yes | Open | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
Note:Pins designated should be in the closed position. Before installing the Pentium upgrade board, remove the processor in the ZIF socket at U13. | ||||||
VIDEO MEMORY CONFIGURATION | ||
Size | Bank 0 | Bank 1 |
1MB | (2) 46256 | (2) 46256 |
2MB | (2) 46256 | (2) 46256 |