AST RESEARCH, INC.
ADVANTAGE! PRO 486
(202643-110, 202688-103)
Processor | 80486SX/SL80486DX/SL80486DX2/80486DX4/Pentium Overdrive |
Processor Speed | 25/33/50(internal)/66(internal)/75(internal)/100(internal)MHz |
Chip Set | Unidentified |
Max. Onboard DRAM | 64MB |
Cache | 64/256KB |
BIOS | Unidentified |
Dimensions | 355mm x 305mm |
I/O Options | 32-bit VESA local bus slot, floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), 8514 video pass through connector, VGA port |
NPU Options | None |

CONNECTIONS | |||
Purpose | Location | Purpose | Location |
VGA port | CN1 | IDE interface | J22 |
Parallel port | CN2 | Floppy drive interface | J24 |
Serial port | CN3 | Speaker | J27 |
Serial port | CN4 | Chassis fan power | J28 |
PS/2 mouse port | CN5 | Front panel connector | J29 |
VGA feature connector | J19 | 32-bit VESA local bus slot | SL1 |
Note: The location of J27 is unidentified. | |||
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Parallel port IRQ select IRQ7 | E2 | pins 1 & 2 closed |
Parallel port IRQ select IRQ5 | E2 | pins 2 & 3 closed | |
» | On board video enabled | E7 | Closed |
On board video disabled | E7 | Open | |
» | Monitor type select color | E8 | Closed |
Monitor type select monochrome | E8 | Open | |
» | Factory configured - do not alter | E9 | Closed |
» | Password enabled | E10 | Closed |
Password disabled | E10 | Open | |
» | Factory configured - do not alter | E11 | Open |
» | Factory configured - do not alter | E16 | Open |
Note: The locations of E11 & E16 are unidentified. | |||
DRAM CONFIGURATION | ||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
1MB | (1) 256K x 32 | NONE | NONE | NONE |
2MB | (1) 256K x 32 | (1) 256K x 32 | NONE | NONE |
3MB | (1) 256K x 32 | (1) 256K x 32 | (1) 256K x 32 | NONE |
4MB | (1) 1M x 32 | NONE | NONE | NONE |
4MB | (1) 256K x 32 | (1) 256K x 32 | (1) 256K x 32 | (1) 256K x 32 |
5MB | (1) 1M x 32 | (1) 256K x 32 | NONE | NONE |
6MB | (1) 1M x 32 | (1) 256K x 32 | (1) 256K x 32 | NONE |
7MB | (1) 1M x 32 | (1) 256K x 32 | (1) 256K x 32 | (1) 256K x 32 |
8MB | (1) 1M x 32 | (1) 1M x 32 | NONE | NONE |
9MB | (1) 1M x 32 | (1) 1M x 32 | (1) 256K x 32 | NONE |
10MB | (1) 1M x 32 | (1) 1M x 32 | (1) 256K x 32 | (1) 256K x 32 |
12MB | (1) 1M x 32 | (1) 1M x 32 | (1) 1M x 32 | NONE |
13MB | (1) 1M x 32 | (1) 1M x 32 | (1) 1M x 32 | (1) 256K x 32 |
16MB | (1) 4M x 32 | NONE | NONE | NONE |
16MB | (1) 1M x 32 | (1) 1M x 32 | (1) 1M x 32 | (1) 1M x 32 |
17MB | (1) 4M x 32 | (1) 256K x 32 | NONE | NONE |
18MB | (1) 4M x 32 | (1) 256K x 32 | (1) 256K x 32 | NONE |
DRAM CONFIGURATION (CON’T) | ||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
19MB | (1) 4M x 32 | (1) 256K x 32 | (1) 256K x 32 | (1) 256K x 32 |
20MB | (1) 4M x 32 | (1) 1M x 32 | NONE | NONE |
21MB | (1) 4M x 32 | (1) 1M x 32 | (1) 256K x 32 | NONE |
22MB | (1) 4M x 32 | (1) 1M x 32 | (1) 256K x 32 | (1) 256K x 32 |
24MB | (1) 4M x 32 | (1) 1M x 32 | (1) 1M x 32 | NONE |
25MB | (1) 4M x 32 | (1) 1M x 32 | (1) 1M x 32 | (1) 256K x 32 |
28MB | (1) 4M x 32 | (1) 1M x 32 | (1) 1M x 32 | (1) 1M x 32 |
32MB | (1) 4M x 32 | (1) 4M x 32 | NONE | NONE |
33MB | (1) 4M x 32 | (1) 4M x 32 | (1) 256K x 32 | NONE |
34MB | (1) 4M x 32 | (1) 4M x 32 | (1) 256K x 32 | (1) 256K x 32 |
36MB | (1) 4M x 32 | (1) 4M x 32 | (1) 1M x 32 | NONE |
37MB | (1) 4M x 32 | (1) 4M x 32 | (1) 1M x 32 | (1) 256K x 32 |
40MB | (1) 4M x 32 | (1) 4M x 32 | (1) 1M x 32 | (1) 1M x 32 |
48MB | (1) 4M x 32 | (1) 4M x 32 | (1) 4M x 32 | NONE |
49MB | (1) 4M x 32 | (1) 4M x 32 | (1) 4M x 32 | (1) 256K x 32 |
52MB | (1) 4M x 32 | (1) 4M x 32 | (1) 4M x 32 | (1) 1M x 32 |
64MB | (1) 4M x 32 | (1) 4M x 32 | (1) 4M x 32 | (1) 4M x 32 |
CACHE CONFIGURATION | ||
Size | Bank 0 | TAG |
64KB | (8) 8K x 8 | (1) 8K x 9 |
256KB | (8) 32K x 8 | (1) 32K x 9 |
CACHE JUMPER CONFIGURATION | ||
Size | E12 | E14 |
None | Open | Open |
64KB | Open | Open |
256KB | Closed | Closed |
CACHE CONFIGURATION | |||
Type | E1 | E6 | E20 |
Write through | pins 1 & 2 closed | pins 1 & 2 closed | Open |
Write back | pins 2 & 3 closed | pins 2 & 3 closed | Closed |
Note: Jumper E20 may not be present on all boards. | |||
CPU TYPE CONFIGURATION | ||||
Type | E3 | E4 | E5 | E13 |
80486SX(PQFP) | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed | Open |
80486SX(PGA) | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
SL-series CPU’s | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed | Closed |
P24T | pins 2 & 3 closed | pins 1 & 2 closed | pins 2 & 3 closed | Closed |
CPU TYPE CONFIGURATION (1995 MANUFACTURE DATE ONLY) | |||
Type | E17 | E18 | E19 |
Cyrix | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |
Intel | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed |
Note: If above jumpers are not present, the mainboard will only support the CPU supplied by the factory. | |||
CPU SPEED CONFIGURATION | |
Speed | E15 |
25MHz | Closed |
33MHz | Open |
50iMHz | Closed |
66iMHz | Open |
75iMHz | Closed |
100iMHz | Open |
VIDEO MEMORY CONFIGURATION (1994 MANUFACTURE DATE) | ||
Size | Bank 0 | Bank 1 |
512KB | (4) 256K x 4 | NONE |
1MB | (4) 256K x 4 | (4) 256K x 4 |
VIDEO MEMORY CONFIGURATION (1995 MANUFACTURE DATE) | ||
Size | Bank 0 | Bank 1 |
512KB | (1) 256K x 16 | NONE |
1MB | (1) 256K x 16 | (1) 256K x 16 |
MISCELLANEOUS TECHNICAL NOTE |
Board shown is 1994 manufacture date. 1994 boards only accept Intel processors. 1995 boards support Intel or Cyrix processors. |