AST RESEARCH, INC.
PREMIUM II 486SX/20 & 486SX/25
MODELS 202373-001 & 202373-002
|
Processor |
80486SX/80487SX (on external CPU/Memory module) |
|
Processor Speed |
20/25MHz |
|
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 |
Front panel switches & LEDs |
P5 |
|
Bus mouse port |
CN2 |
Speaker |
P6 |
|
Serial port 1 (COM1) |
CN3 |
External battery |
P8 |
|
Parallel port |
CN4 |
IDE interface |
P11 |
|
Serial port 2 (COM2) |
J15 |
Fan power |
P101 |
|
VGA pass-through |
J18 |
32-bit external CPU/Memory module |
S1 |
|
Floppy drive interface |
P3 |
32-bit external Memory module slot |
S2 |
|
Third floppy drive interface |
P4 |
32-bit external Memory module slot |
S3 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Switch SW1 |
Position | |
|
VGA port enabled |
switch 1 |
closed | |
|
VGA port disabled |
switch 1 |
open | |
|
Password check enabled |
switch 2 |
open | |
|
Password check disabled |
switch 2 |
closed | |
|
Factory configured - do not alter |
switch 3 |
open | |
|
Factory configured - do not alter |
switch 4 |
open | |
|
Factory configured - do not alter |
switch 5 |
closed | |
|
Factory configured - do not alter |
switch 6 |
closed | |
|
Monitor type select PS/2 style |
switch 7 |
closed | |
|
Monitor type select AT style |
switch 7 |
open | |
|
Monitor type select VGA or fixed-frequency |
switch 8 |
open | |
|
Monitor type select multi-frequency |
switch 8 |
closed | |
|
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 202436-001. | |||
|
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. | ||