COMPUTREND SYSTEMS, INC.
VLB486 AL5 (ALI-486G)
Processor | 80486SX/SL80486SX/80486DX/SL80486DX/CXM7/AM486DX2/80486DX2/ SL80486DX2/AM486DX4/80486DX4/P24D/P24T |
Processor Speed | 25/33/40/50(internal)/50/66(internal)/75(internal)/80(internal)/ 100(internal)MHz |
Chip Set | ALI |
Max. Onboard DRAM | 64MB |
Cache | 128/256KB |
BIOS | AMI |
Dimensions | 250mm x 220mm |
I/O Options | 32-bit VESA local bus slots (3), green PC connector |
NPU Options | None |

CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | JB | Reset switch | JFP pins 19 & 20 |
Power LED & keylock | JFP pins 1 - 5 | Green PC connector (monitor) | JG1 |
Speaker | JFP pins 7 - 10 | Green PC LED | JG2 |
Turbo LED | JFP pins 12 & 13 | Green PC connector | JG3 |
Turbo switch | JFP pins 15 - 17 | 32-bit VESA local bus slots | SL1 - SL3 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Battery type select internal | JB | Pins 2 & 3 closed |
| Battery type select external | JB | Closed |
» | Factory configured - do not alter | JC2 | N/A |
» | Factory configured - do not alter | JC3 | N/A |
» | Monitor type select monochrome | JP1 | Pins 2 & 3 closed |
| Monitor type select color | JP1 | Pins 1 & 2 closed |
DRAM CONFIGURATION | ||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
1MB | (1) 256K x 36 | None | None | None |
2MB | (1) 512K x 36 | None | None | None |
2MB | (1) 256K x 36 | (1) 256K x 36 | None | None |
3MB | (1) 512K x 36 | (1) 256K x 36 | None | None |
3MB | (1) 256K x 36 | (1) 256K x 36 | (1) 256K x 36 | None |
3MB | (1) 256K x 36 | (1) 512K x 36 | None | None |
4MB | (1) 1M x 36 | None | None | None |
4MB | (1) 512K x 36 | (1) 256K x 36 | (1) 256K x 36 | None |
4MB | (1) 512K x 36 | (1) 512K x 36 | None | None |
4MB | (1) 256K x 36 | (1) 256K x 36 | (1) 256K x 36 | (1) 256K x 36 |
5MB | (1) 1M x 36 | (1) 256K x 36 | None | None |
5MB | (1) 512K x 36 | (1) 256K x 36 | (1) 256K x 36 | (1) 256K x 36 |
5MB | (1) 256K x 36 | (1) 1M x 36 | None | None |
6MB | (1) 1M x 36 | (1) 256K x 36 | (1) 256K x 36 | None |
6MB | (1) 1M x 36 | (1) 512K x 36 | None | None |
6MB | (1) 512K x 36 | (1) 1M x 36 | None | None |
7MB | (1) 1M x 36 | (1) 256K x 36 | (1) 256K x 36 | (1) 256K x 36 |
8MB | (1) 2M x 36 | None | None | None |
8MB | (1) 1M x 36 | (1) 1M x 36 | None | None |
9MB | (1) 2M x 36 | (1) 256K x 36 | None | None |
9MB | (1) 256K x 36 | (1) 1M x 36 | (1) 1M x 36 | None |
9MB | (1) 256K x 36 | (1) 2M x 36 | None | None |
10MB | (1) 2M x 36 | (1) 256K x 36 | (1) 256K x 36 | None |
10MB | (1) 2M x 36 | (1) 512K x 36 | None | None |
10MB | (1) 512K x 36 | (1) 1M x 36 | (1) 1M x 36 | None |
10MB | (1) 512K x 36 | (1) 2M x 36 | None | None |
12MB | (1) 2M x 36 | (1) 1M x 36 | None | None |
12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 | None |
12MB | (1) 1M x 36 | (1) 2M x 36 | None | None |
13MB | (1) 256K x 36 | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 |
16MB | (1) 4M x 36 | None | None | None |
16MB | (1) 2M x 36 | (1) 1M x 36 | (1) 1M x 36 | None |
16MB | (1) 2M x 36 | (1) 2M x 36 | None | None |
16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 |
17MB | (1) 4M x 36 | (1) 256K x 36 | None | None |
17MB | (1) 256K x 36 | (1) 4M x 36 | None | None |
18MB | (1) 4M x 36 | (1) 256K x 36 | (1) 256K x 36 | None |
18MB | (1) 4M x 36 | (1) 512K x 36 | None | None |
18MB | (1) 512K x 36 | (1) 4M x 36 | None | None |
19MB | (1) 4M x 36 | (1) 256K x 36 | (1) 256K x 36 | (1) 256K x 36 |
20MB | (1) 4M x 36 | (1) 1M x 36 | None | None |
20MB | (1) 1M x 36 | (1) 4M x 36 | None | None |
24MB | (1) 4M x 36 | (1) 1M x 36 | (1) 1M x 36 | None |
24MB | (1) 4M x 36 | (1) 2M x 36 | None | None |
24MB | (1) 2M x 36 | (1) 4M x 36 | None | None |
28MB | (1) 4M x 36 | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 |
32MB | (1) 8M x 36 | None | None | None |
32MB | (1) 4M x 36 | (1) 4M x 36 | None | None |
33MB | (1) 8M x 36 | (1) 256K x 36 | None | None |
33MB | (1) 256K x 36 | (1) 4M x 36 | (1) 4M x 36 | None |
33MB | (1) 256K x 36 | (1) 8M x 36 | None | None |
34MB | (1) 8M x 36 | (1) 256K x 36 | (1) 256K x 36 | None |
34MB | (1) 8M x 36 | (1) 512K x 36 | None | None |
34MB | (1) 512K x 36 | (1) 4M x 36 | (1) 4M x 36 | None |
34MB | (1) 512K x 36 | (1) 8M x 36 | None | None |
36MB | (1) 1M x 36 | (1) 4M x 36 | (1) 4M x 36 | None |
36MB | (1) 1M x 36 | (1) 8M x 36 | None | None |
40MB | (1) 8M x 36 | (1) 1M x 36 | (1) 1M x 36 | None |
40MB | (1) 8M x 36 | (1) 2M x 36 | None | None |
40MB | (1) 2M x 36 | (1) 4M x 36 | (1) 4M x 36 | None |
40MB | (1) 2M x 36 | (1) 8M x 36 | None | None |
48MB | (1) 8M x 36 | (1) 4M x 36 | None | None |
48MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x 36 | None |
48MB | (1) 4M x 36 | (1) 8M x 36 | None | None |
49MB | (1) 256K x 36 | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x 36 |
52MB | (1) 1M x 36 | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x 36 |
64MB | (1) 8M x 36 | (1) 8M x 36 | None | None |
64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x 36 |
CACHE CONFIGURATION | |||
Size | Bank 0 | Bank 1 | TAG |
128KB | (4) 32K x 8 | None | (1) 8K/16K/32K x 8 |
256KB (A) | (4) 32K x 8 | (4) 32K x 8 | (1) 16K/32K x 8 |
256KB (B) | (4) 64K x 8 | None | (1) 16K/32K x 8 |
CACHE JUMPER CONFIGURATION | |||
Size | JS1 | JS2 | JS3 |
128KB | Pins 2 & 3 closed | Pins 2 & 3 closed | Pins 2 & 3 closed |
256KB (A) | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 2 & 3 closed |
256KB (B) | Pins 2 & 3 closed | Pins 1 & 2 closed | Pins 2 & 3 closed |
CPU TYPE CONFIGURATION | |||
Type | JC4 | JC5 | JC6 |
80486SX | Pins 2 & 3 closed | Pins 4 & 5 closed | Open |
SL80486SX | Pins 2 & 3 closed | Pins 5 & 6 closed | Open |
80486DX | Pins 1 & 2, 3 & 4 closed | Pins 4 & 5 closed | Pins 3 & 4 closed |
SL80486DX | Pins 1 & 2, 3 & 4 closed | Pins 5 & 6 closed | Pins 3 & 4 closed |
CXM7 | Pins 1 & 2, 3 & 4 closed | Pins 1 & 2, 4 & 5 closed | Pins 3 & 4 closed |
AM486DX2-80 (3.3v) | Pins 1 & 2, 3 & 4 closed | Pins 2 & 3, 4 & 5 closed | Pins 3 & 4 closed |
AM486DX2-80 (5v) | Pins 1 & 2, 3 & 4 closed | Pins 4 & 5 closed | Pins 3 & 4 closed |
80486DX2 | Pins 1 & 2, 3 & 4 closed | Pins 4 & 5 closed | Pins 3 & 4 closed |
SL80486DX2 | Pins 1 & 2, 3 & 4 closed | Pins 5 & 6 closed | Pins 3 & 4 closed |
AM486DX4 | Pins 1 & 2, 3 & 4 closed | Pins 4 & 5 closed | Pins 3 & 4 closed |
80486DX4 | Pins 1 & 2, 3 & 4 closed | Pins 5 & 6 closed | Pins 3 & 4 closed |
P24D | Pins 1 & 2, 3 & 4 closed | Pins 5 & 6 closed | Pins 2 & 3 closed |
P24T | Pins 1 & 2, 3 & 4 closed | Pins 5 & 6 closed | Pins 2 & 3 closed |
CPU TYPE CONFIGURATION (CON'T) | |||
Type | JC7 | JC8 | JC10 |
80486SX | Open | Pins 4 & 5 closed | Open |
SL80486SX | Pins 5 & 6 closed | Pins 4 & 5 closed | Open |
80486DX | Open | Pins 4 & 5 closed | Open |
SL80486DX | Pins 5 & 6 closed | Pins 4 & 5 closed | Open |
CXM7 | Pins 2 & 3, 4 & 5 closed | Pins 4 & 5 closed | Open |
AM486DX2-80 (3.3v) | Open | Pins 4 & 5 closed | Open |
AM486DX2-80 (5v) | Open | Pins 4 & 5 closed | Open |
80486DX2 | Open | Pins 4 & 5 closed | Open |
SL80486DX2 | Pins 5 & 6 closed | Pins 4 & 5 closed | Open |
AM486DX4 | Open | Pins 4 & 5 closed | Open |
80486DX4 | Pins 5 & 6 closed | Pins 4 & 5 closed | Open |
P24D | Pins 5 & 6 closed | Pins 5 & 6 closed | Pins 1 & 2, 3 & 4 closed |
P24T | Pins 5 & 6 closed | Pins 4 & 5 closed | Open |

CPU TYPE CONFIGURATION (CON'T) | |
Type | JC5/6/7/8 |
SL80486SX | JC5 pin 1/JC6 pin 1 & JC7 pin 1/JC8 pin 1 |
SL80486DX | JC5 pin 1/JC6 pin 1 & JC7 pin 1/JC8 pin 1 |
SL80486DX2 | JC5 pin 1/JC6 pin 1 & JC7 pin 1/JC8 pin 1 |
80486DX4 | JC5 pin 1/JC6 pin 1 & JC7 pin 1/JC8 pin 1 |
P24D | JC5 pin 1/JC6 pin 1 & JC7 pin 1/JC8 pin 1 |
P24T | JC5 pin 1/JC6 pin 1 & JC7 pin 1/JC8 pin 1 |
Note: See above figure for jumper placement. | |
CPU TYPE CONFIGURATION | |
Type | JK5 |
All CPU types | Closed |
P24C only | Open |
CPU TYPE CONFIGURATION | |
Type | JC1 |
All CPU types | Pins 1 & 2 closed |
CX M7 only | Pins 2 & 3 closed |
CPU SPEED CONFIGURATION | ||||
Speed | JK1 | JK2 | JK3 | JK4 |
25MHz | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 6, 4 & 9, 5 & 10 |
33MHz | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 6, 2 & 7, 3 & 8, 4 & 9, 5 & 10 |
40MHz | 2 & 3 | 4 & 5 | 2 & 3 | 2 & 7, 4 & 9 |
50iMHz | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 6, 4 & 9, 5 & 10 |
50iMHz (CX only) | 2 & 3 | 4 & 5 | 2 & 3 | 4 & 9, 5 & 10 |
50MHz | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 6, 4 & 9 |
66iMHz | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 6, 2 & 7, 3 & 8, 4 & 9, 5 & 10 |
75iMHz | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 6, 4 & 9, 5 & 10 |
80iMHz | 2 & 3 | 4 & 5 | 2 & 3 | 2 & 7, 4 & 9 |
100iMHz | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 6, 2 & 7, 3 & 8, 4 & 9, 5 & 10 |
Note: Pins designated should be in the closed position. | ||||
CPU VOLTAGE CONFIGURATION | |
Voltage | J50 |
With auto detect | Pins 1 & 7, 2 & 8, 3 & 9 closed |
3.3v | Pins 1 & 7, 2 & 8, 3 & 9 closed |
5v | Pins 4 & 10, 5 & 11, 6 & 12 closed |