AST RESEARCH, INC.
POWER PREMIUM 486SX/25 (MODEL 202441-001)
|
Processor |
80486SX/80487SX (on external CPU/Memory module) |
|
Processor Speed |
25MHz |
|
Chip Set |
AST |
|
Max. Onboard DRAM |
None (16MB on external CPU/Memory module) |
|
Cache |
None |
|
BIOS |
AST |
|
Dimensions |
344mm x 250mm |
|
I/O Options |
32-bit external CPU/Memory module slot 32-bit external Memory module slot (2) bus mouse port, floppy drive interface IDE interface, parallel port, serial port (2), SVGA port |
|
NPU Options |
4167 (on external CPU/Memory module) |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
SVGA port |
CN1 |
Third floppy drive interface |
J25 |
|
Bus mouse port |
CN2 |
External battery |
J26 |
|
Serial port 1 (COM1) |
CN3 |
Speaker |
J27 |
|
Serial port 2 (COM2) |
CN4 |
Fan power |
J28 |
|
Parallel port |
J13 |
Front panel switches & LEDs |
J29 |
|
VGA pass-through |
J19 |
IDE interface LED |
J40 |
|
IDE interface |
J22 |
32-bit external CPU/Memory module |
S1 |
|
Floppy drive interface |
J24 |
32-bit external Memory module slots |
S2 & S3 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper/Switch |
Position | |
|
CMOS memory normal operation |
SW1/switch 1 |
open | |
|
CMOS memory clear |
SW1/switch 1 |
closed | |
|
Password check enabled |
SW1/switch 2 |
open | |
|
Password check disabled |
SW1/switch 2 |
closed | |
|
Flash BIOS write disabled |
SW1/switch 3 |
open | |
|
Flash BIOS write enabled |
SW1/switch 3 |
closed | |
|
VGA port enabled |
SW1/switch 4 |
closed | |
|
VGA port disabled |
SW1/switch 4 |
open | |
|
Factory configured - do not alter |
E1 |
closed | |
|
Factory configured - do not alter |
E2 |
pins 1 & 2 closed | |
|
Factory configured - do not alter |
E3 |
closed | |
|
Factory configured - do not alter |
E4 |
open | |
|
Factory configured - do not alter |
E5 |
open | |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
Parity check enabled |
E1 |
closed | |
|
Parity check disabled |
E1 |
open | |
|
Factory configured - do not alter |
E2 |
closed | |
|
Note:AST CPU/Memory module part number is 202439-002. | |||
|
DRAM CONFIGURATION | ||
|
Size |
Bank 0 |
Bank 1 |
|
2MB |
(2) 1M x 9 |
NONE |
|
4MB |
(2) 1M x 9 |
(2) 1M x 9 |
|
8MB |
(2) 4M x 9 |
NONE |
|
10MB |
(2) 1M x 9 |
(2) 4M x 9 |
|
16MB |
(2) 4M x 9 |
(2) 4M x 9 |
|
Notes:128KB of DRAM is reserved for System and VGA BIOS shadowing and cannot be disabled. Up to two of the following memory boards may be installed in addition to the CPU/Memory module: AST part numbers 202275-004, 202275-006, 202387-001, or 202387-005. | ||