AUSTIN COMPUTER SYSTEMS
486U
Processor | 80486SX/80487SX/80486DX/80486DX2 |
Processor Speed | 20/25/33/50(internal)/50/66(internal)MHz |
Chip Set | OPTI |
Max. Onboard DRAM | 32MB |
Cache | 64/256KB |
BIOS | Mylex |
Dimensions | 330mm x 218mm |
I/O Options | Floppy drive interface, IDE interface, parallel port, serial ports (2) |
NPU Options | 4167 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Parallel port | J1 | Turbo LED | JP3 |
Serial port COM 2 | J2 | Reset switch | JP4 |
Serial port COM 1 | J3 | Speaker | JP5 |
Floppy controller | J4 | IDE interface LED | JP6 |
IDE interface | J5 | External battery | JP22 |
Power LED & keylock | JP2 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Monitor type select monochrome | JP1 | open |
Monitor type select color | JP1 | closed | |
» | Parallel port IRQ select IRQ7 | JP19 | pins 2 & 3 closed |
Parallel port IRQ select IRQ5 | JP19 | pins 1 & 2 closed | |
» | CMOS memory normal operation | JP21 | pins 2 & 3 closed |
CMOS memory clear | JP21 | pins 1 & 2 closed |
DRAM CONFIGURATION | ||
Size | Bank 0 | Bank 1 |
1MB | (4) 256K x 9 | NONE |
2MB | (4) 256K x 9 | (4) 256K x 9 |
4MB | (4) 1M x 9 | NONE |
5MB | (4) 1M x 9 | (4) 256K x 9 |
8MB | (4) 1M x 9 | (4) 1M x 9 |
16MB | (4) 4M x 9 | NONE |
32MB | (4) 4M x 9 | (4) 4M x 9 |
CACHE CONFIGURATION | |||
Size | Bank 0 | TAG (U1) | TAG (U2) |
64KB | (8) 8K x 8 | (1) 64K x 1 | (1) 8K x 8 |
256KB | (8) 32K x 8 | (1) 64K x 1 | (1) 32K x 8 |
CACHE JUMPER CONFIGURATION | ||||
Size | JP7 | JP11 | JP12 | JP13 |
64KB | Open | Open | Open | Open |
256KB | Closed | Closed | Open | Closed |
CPU TYPE CONFIGURATION | |||
Type | JP8 | JP9 | JP10 |
80486SX | Open | pins 2 & 3 closed | Open |
80487SX | pins 2 & 3 closed | pins 1 & 2 closed | Closed |
80486DX | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
80486DX2 | pins 1 & 2 closed | pins 1 & 2 closed | Closed |
CPU SPEED CONFIGURATION | |||||
Speed | JP14 | JP15 | JP16 | JP17 | JP18 |
20MHz | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 | Open |
25MHz | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | Open |
33MHz | 2 & 3 | 1 & 2 | 1 & 2 | 2 & 3 | Open |
50MHz | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 | Closed |
50iMHz | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | Open |
66iMHz | 2 & 3 | 1 & 2 | 1 & 2 | 2 & 3 | Open |
Note: Pins designated should be in the closed position. |
ON BOARD I/O CONFIGURATION | |
Setting | JP20 |
Serial port 1, serial port 2, parallel port, floppy drive interface enabled | pins 1 & 2 closed |
Serial port 1, serial port 2, parallel port, floppy drive interface disabled | pins 2 & 3 closed |