TEXAS MICROSYSTEMS, INC.
D486 (REL. 2)
|
Processor |
80486DX/80486DX2/80486DX4 |
|
Processor Speed |
33/50/66(internal)/100(internal)MHz |
|
Chip Set |
Unidentified |
|
Video Chip Set |
None |
|
Maximum Onboard Memory |
128MB |
|
Maximum Video Memory |
None |
|
Cache |
64/128/256KB |
|
BIOS |
Unidentified |
|
Dimensions |
Unidentified |
|
I/O Options |
Floppy drive interface, IDE interface, parallel port, serial ports (2) |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
IDE interface |
CN1 |
Parallel port |
CN5 |
|
Floppy drive interface |
CN2 |
AT keyboard connector |
CN6 |
|
Serial port 2 |
CN3 |
External battery |
JP9 |
|
Serial port 1 |
CN4 |
IDE interface LED |
JP10 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Label |
Position | |
|
|
Battery type select internal |
JP9 |
Pins 1 & 2 closed |
|
Battery type select external |
JP9 |
Closed | |
|
|
Watchdog timer disabled |
JP11 |
Pins 2 & 3 closed |
|
Watchdog timer enabled |
JP11 |
Pins 1 & 2 closed | |
|
|
Monitor type select color |
SW1/1 |
On |
|
Monitor type select monochrome |
SW1/1 |
Off | |
|
|
Flash BIOS enabled |
SW1/2 |
Off |
|
Flash BIOS disabled |
SW1/2 |
On | |
|
|
CMOS memory normal operation |
SW1/3 |
Off |
|
CMOS memory clear |
SW1/3 |
On | |
|
|
I/O address select 270H |
SW1/4 |
Off |
|
I/O address select 370H |
SW1/4 |
On | |
|
DRAM CONFIGURATION | ||
|
Size |
Bank 0 |
Bank 1 |
|
8MB |
(2) 1M 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 |
|
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 |
|
96MB |
(2) 8M x 36 |
(2) 4M x 36 |
|
128MB |
(2) 8M x 36 |
(2) 8M x 36 |
|
Note: Board also accepts x 32 SIMMs. | ||
|
CACHE CONFIGURATION |
|
Note: The chip sizes and location of the cache is unidentified. |
|
CACHE JUMPER CONFIGURATION | ||||
|
Size |
JP5 |
JP6 |
JP7 |
JP8 |
|
64KB |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
Open |
|
128KB |
Pins 2 & 3 closed |
Pins 1 & 2 closed |
Pins 2 & 3 closed |
Pins 1 & 2 closed |
|
256KB |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Pins 1 & 2 closed |
Pins 2 & 3 closed |
|
CPU SPEED SELECTION | |
|
Speed |
JP4 |
|
33MHz |
Pins 1 & 2 closed |
|
CPU TYPE SELECTION | ||||
|
Type |
JP1 |
JP2 |
JP3 |
JP14 |
|
80486DX |
Pins 1 & 2 closed |
Pins 2 & 3 closed |
Pins 1 & 2 closed |
Pins 2 & 3 closed |
|
80486DX2 |
Pins 1 & 2 closed |
Pins 2 & 3 closed |
Pins 1 & 2 closed |
Pins 2 & 3 closed |
|
80486DX4 |
Pins 1 & 2 closed |
Pins 2 & 3 closed |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
|
CPU MULTIPLIER SELECTION (80486DX4 ONLY) | |
|
Multiplier |
JP13 |
|
2x |
Pins 2 & 3 closed |
|
3x |
Pins 1 & 2 closed |
|
WATCHDOG TIMER SELECTION | ||
|
Timer |
JP12 | |
|
150ms |
Pins 2 & 3 closed | |
|
600ms |
Open | |
|
1.2 seconds |
Pins 1 & 2 closed | |