AST RESEARCH, INC.
PREMIUM 4/66D III+ (501709-101)
| Device Type | Mainboard |
| Processor | CX486SX/CX486DX/CX486DX2/CX486DX4/80486SX/80486DX/80486DX2/ 80486DX4/Pentium |
| Processor Speed | 33/100/MHz |
| Chip Set | Unidentified |
| Video Chip Set | Cirrus Logic |
| Maximum Onboard Memory | 128MB |
| Maximum Video Memory | Unidentified |
| BIOS | Unidentified |
| Dimensions | Unidentified |
| I/O Options | Floppy drive interface, IDE interfaces (2), parallel port, PS/2 mouse port, PS/2 mouse interface, serial ports (2), VGA port, riser slot, AT power connector |
CONNECTIONS |
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| Purpose | Location |
Purpose | Location |
| AT power connector | AT |
Floppy drive interface | J24 |
| PS/2 mouse or keyboard port | CN1 | CMOS Backup battery connector | J26 |
| PS/2 keyboard or mouse port | CN2 | Speaker | J27 |
| Serial port | CN3 | System fan power 1 | J28 |
| Serial port | CN4 | Front console LEDs | J29 |
| Parallel port | CN5 | System fan power 2 | J32 |
| VGA port | CN6 | IDE interface LED | J40 |
| IDE interface 1 | J22 | Riser slot | RISER |
| IDE interface 2 | J23 | ||
USER CONFIGURABLE SETTINGS |
|||
Function |
Label |
Position |
|
| 256KB External cache selected | E5 |
Closed |
|
| 64KB External cache selected | E5 |
Open | |
» |
Factory configured - do not alter | E6 |
Pins 1 & 2 closed |
» |
CMOS memory normal operation | E8 |
Open |
| CMOS memory clear | E8 |
Closed |
|
| Processor 486SX or 486DX enabled | E10 |
Open |
|
| Processor Pentium Overdrive or Write-back 486DX enabled | E10 |
Closed |
|
» |
Factory configured - do not alter | E800 |
Closed |
| » | Normal boot | SW1/1 | Off |
| Flash BIOS updated at boot | SW1/1 | On | |
| » | Password enabled | SW1/2 | On |
| Password disabled | SW1/2 | Off | |
| » | Color display adapter | SW1/3 | On |
| Monochrome display adapter | SW1/3 | Off | |
| » | System setup enabled | SW1/4 | Off |
| System setup disabled | SW1/4 | On | |
| » | Integrated VGA enabled | SW1/5 | On |
| Integrated VGA disabled | SW1/5 | Off | |
» |
Factory configured - do not alter | SW1/6 |
On |
» |
Factory configured - do not alter | SW1/7 |
On |
» |
Factory configured - do not alter | SW1/8 |
Off |
| Note: E3 & E10 must match settings. | |||
SIMM CONFIGURATION |
||
Size |
Bank 0 |
Bank 1 |
8MB |
(2) 1M x 36 |
None |
16MB |
(2) 2M x 36 |
None |
16MB |
(2) 1M x 36 |
(2) 1M x 36 |
24MB |
(2) 2M x 36 |
(2) 1M x 36 |
32MB |
(2) 4M x 36 |
None |
32MB |
(2) 2M x 36 |
(2) 2M x 36 |
40MB |
(2) 4M x 36 |
(2) 1M x 36 |
48MB |
(2) 4M x 36 |
(2) 2M x 36 |
64MB |
(2) 8M x 36 |
None |
64MB |
(2) 4M x 36 |
(2) 4M x 36 |
72MB |
(2) 8M x 36 |
(2) 1M x 36 |
80MB |
(2) 8M x 36 |
(2) 2M x 36 |
96MB |
(2) 8M x 36 |
(2) 4M x 36 |
128MB |
(2) 8M x 36 |
(2) 8M x 36 |
CPU SPEED SELECTION |
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Speed |
E4 | E7 | E9 |
25MHz |
N/A | Pins 1 & 2 closed | Closed |
33MHz |
N/A | Pins 2 & 3 closed | Open |
50MHz |
N/A | Pins 1 & 2 closed | Closed |
66MHz |
N/A | Pins 2 & 3 closed | Open |
100MHz |
Open | Pins 1 & 2 closed | Closed |
CPU TYPE SELECTION (CYRIX) |
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Type |
E1 | E2 | E3 | E10 |
| 486SX | Open | Pins 2 & 3 closed | Pins 1 & 2 closed | Closed |
| 486DX | Open | Pins 1 & 2 closed | Pins 1 & 2 closed | Closed |
| 486DX2 | Open | Pins 1 & 2 closed | Pins 1 & 2 closed | Closed |
| 486DX4 | Open | Pins 1 & 2 closed | Pins 1 & 2 closed | Closed |
CPU TYPE SELECTION (INTEL) |
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Type |
E1 | E2 | E3 | E10 |
| 486SX | Open | Pins 2 & 3 closed | Pins 1 & 2 closed | Closed |
| 486DX | Open | Pins 1 & 2 closed | Pins 1 & 2 closed | Closed |
| 486DX2 | Open | Pins 1 & 2 closed | Pins 1 & 2 closed | Closed |
| 486DX4 | Open | Pins 1 & 2 closed | Pins 1 & 2 closed | Closed |
| 486 Overdrive | Open | Pins 2 & 3 closed | Pins 1 & 2 closed | Closed |
| Pentium Overdrive | Open | Pins 2 & 3 closed | Pins 2 & 3 closed | Open |
| Writeback DX | Open | Pins 1 & 2 closed | Pins 2 & 3 closed | Open |
CPU MULTIPLIER SELECTION |
|
Multiplier |
E4 |
2x |
Pins 2 & 3 closed |
| 2.5x | Pins 1 & 2 closed |
| 3x | Open |
CPU VOLTAGE SELECTION (CYRIX) |
||||||
Voltage |
E11 | E12 | E13 | E14 | E15 | E16 |
| 3v | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | Open | 1 & 2 |
| 5v | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 | Open | Open |
| Note: Pins designated should be in the closed position. | ||||||
CPU VOLTAGE SELECTION (INTEL) |
||||||
Voltage |
E11 | E12 | E13 | E14 | E15 | E16 |
| 3v | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | Closed | 2 & 3 |
| 5v | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 | Closed | Open |
| Note: Pins designated should be in the closed position. | ||||||