UNITRON COMPUTER, INC.
486SX SYSTEM
|
Processor |
80486SX/80486DX |
|
Processor Speed |
25/33MHz |
|
Chip Set |
UMC |
|
Max. Onboard DRAM |
32MB |
|
SRAM Cache |
32/128KB |
|
BIOS |
Phoenix |
|
Dimensions |
346mm x 218mm |
|
I/O Options |
Floppy drive interface, game port, IDE interface, modem interface, parallel port, serial port (2), VGA port |
|
NPU Options |
4167 (location unverified) |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Game port |
C1 |
IDE interface |
J22 |
|
VGA port |
C2 |
Modem interface |
J23 |
|
Parallel port |
C3 |
Turbo LED |
J26 |
|
Serial port 2 |
C4 |
Power LED |
J28 |
|
Serial port 1 |
C5 |
Floppy drive interface |
J31 |
|
Fan power |
J3 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
Serial port 1 (CN5) enabled |
J18 |
pins 1 & 2 closed | |
|
Serial port 1 (CN5) disabled |
J18 |
pins 2 & 3 closed | |
|
Serial port 1 (CN5) select COM1 (I/O address 3F8-3FFh) |
J19 |
pins 1 & 2 closed | |
|
Serial port 1 (CN5) select COM3 (I/O address 3E8-3EFh) |
J19 |
pins 2 & 3 closed | |
|
Parallel port (C3) select LPT1 interrupt IRQ7 at 378-37F |
J20 |
pins 1 & 2 closed | |
|
Parallel port (C3) select LPT2 interrupt IRQ5 at 278-27F |
J20 |
pins 2 & 3 closed | |
|
Parallel port (CN3) enabled |
J21 |
pins 1 & 2 closed | |
|
Parallel port (CN3) disabled |
J21 |
pins 2 & 3 closed | |
|
IDE interface (J22) enabled |
J25 |
pins 1 & 2 closed | |
|
IDE interface (J22) disabled |
J25 |
pins 2 & 3 closed | |
|
Floppy drive interface (J31) enabled |
J27 |
pins 1 & 2 closed | |
|
Floppy drive interface (J31) disabled |
J27 |
pins 2 & 3 closed | |
|
Serial port 2 (CN4) select COM2 (I/O address 2F8-2FFh) |
J29 |
pins 1 & 2 closed | |
|
Serial port 2 (CN4) select COM4 (I/O address 2E8-2EFh) |
J29 |
pins 2 & 3 closed | |
|
Serial port 2 (CN4) enabled |
J30 |
pins 1 & 2 closed | |
|
Serial port 2 (CN4) disabled |
J30 |
pins 2 & 3 closed | |
|
DRAM CONFIGURATION | ||
|
Size |
Bank 0 |
Bank 1 |
|
1MB |
(1) 256K x 36 |
NONE |
|
2MB |
(1) 256K x 36 |
(1) 256K x 36 |
|
3MB |
(1) 512K x 36 |
(1) 256K x 36 |
|
4MB |
(1) 1M x 36 |
NONE |
|
5MB |
(1) 256K x 36 |
(1) 1M x 36 |
|
8MB |
(1) 1M x 36 |
(1) 1M x 36 |
|
12MB |
(1) 2M x 36 |
(1) 1M x 36 |
|
16MB |
(1) 2M x 36 |
(1) 2M x 36 |
|
32MB |
(1) 4M x 36 |
(1) 4M x 36 |
|
CPU TYPE CONFIGURATION | ||
|
CPU |
JP1 |
JP2 |
|
80486DX |
pins 1 & 2 closed |
pins 1 & 2 and 3 & 4 closed |
|
80486SX |
open |
pins 2 & 3 closed |
|
Note:The location of jumpers JP1 and JP2 is unknown. | ||
|
SRAM JUMPER CONFIGURATION | |||||
|
Size |
J7 |
J10 |
J11 |
J13 |
J14 |
|
32KB |
open |
pins 1 & 2 |
pins 1 & 2 |
pins 1 & 2 |
pins 1 & 2 |
|
128KB |
closed |
pins 2 & 3 |
pins 2 & 3 |
pins 2 & 3 |
pins 2 & 3 |
|
Note:Pins designated should be in the closed postion. | |||||
|
SRAM CONFIGURATION | |||
|
Size |
Cache SRAM |
Location |
TAG |
|
32KB |
(4) 8K x 8 |
CACHE |
(1) 8K x 8 |
|
128KB |
(4) 32K x 8 |
CACHE |
(1) 32K x 8 |
|
Note:This configuartion is unverified. | |||
|
VRAM CONFIGURATION | ||
|
Size |
VRAM |
Location |
|
256KB |
(2) 44256 |
Bank 0 |
|
512KB |
(4) 44256 |
Banks 0 & 1 |
|
1MB |
(8) 44256 |
Banks 0, 1, 2 and 3 |