GIGA-BYTE TECHNOLOGY CO., LTD.
GA-486AM
Processor | CX486/AM486/UMC/SL80486SX/80486SX/SL80486DX/80486DX/ SL80486DX2/80486DX2/P24D/AM486DX4/80486DX4/Pentium Overdrive |
Processor Speed | 25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz |
Chip Set | UMC |
Max. Onboard DRAM | 128MB |
Cache | 128/256/512/1024KB |
BIOS | Award |
Dimensions | 280mm x 220mm |
I/O Options | 32-bit PCI slots (3), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, serial ports (2) |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
IDE interface (primary) | CN1 | Speaker | J3 |
IDE interface (secondary) | CN2 | Power LED & keylock | J4 |
Floppy drive interface | CN3 | IDE interface LED | JP1 |
Parallel port | CN4 | Turbo LED | JP2 |
Serial port 2 | CN5 | Green PC connector | JP3 |
Serial port 1 | CN6 | Green PC LED | JP4 |
Reset switch | J1 | Green PC connector | JP25 |
Turbo switch | J2 | 32-bit PCI slots | PC1 - PC3 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Factory configured - do not alter | JP14 | N/A |
» | Factory configured - do not alter | JP18 | N/A |
» | Factory configured - do not alter | JP19 | N/A |
» | Cache type select write through | JP20 | Closed |
Cache type select write back | JP20 | Open |
DRAM CONFIGURATION | ||
Size | Bank 0 | Bank 1 |
2MB | (2) 256K x 36 | NONE |
4MB | (2) 512K x 36 | NONE |
4MB | (2) 256K x 36 | (2) 256K x 36 |
6MB | (2) 256K x 36 | (2) 512K x 36 |
6MB | (2) 512K x 36 | (2) 256K x 36 |
8MB | (2) 512K x 36 | (2) 512K x 36 |
8MB | (2) 1M x 36 | NONE |
10MB | (2) 256K x 36 | (2) 1M x 36 |
10MB | (2) 1M x 36 | (2) 256K x 36 |
12MB | (2) 512K x 36 | (2) 1M x 36 |
12MB | (2) 1M x 36 | (2) 512K x 36 |
16MB | (2) 1M x 36 | (2) 1M x 36 |
16MB | (2) 2M x 36 | NONE |
18MB | (2) 256K x 36 | (2) 2M x 36 |
18MB | (2) 2M x 36 | (2) 256K x 36 |
20MB | (2) 512K x 36 | (2) 2M x 36 |
20MB | (2) 2M x 36 | (2) 512K x 36 |
24MB | (2) 1M x 36 | (2) 2M x 36 |
24MB | (2) 2M x 36 | (2) 1M x 36 |
32MB | (2) 2M x 36 | (2) 2M x 36 |
32MB | (2) 4M x 36 | NONE |
34MB | (2) 256K x 36 | (2) 4M x 36 |
34MB | (2) 4M x 36 | (2) 256K x 36 |
36MB | (2) 512K x 36 | (2) 4M x 36 |
36MB | (2) 4M x 36 | (2) 512K x 36 |
40MB | (2) 1M x 36 | (2) 4M x 36 |
40MB | (2) 4M x 36 | (2) 1M x 36 |
48MB | (2) 2M x 36 | (2) 4M x 36 |
48MB | (2) 4M x 36 | (2) 2M x 36 |
64MB | (2) 4M x 36 | (2) 4M x 36 |
64MB | (2) 8M x 36 | NONE |
66MB | (2) 256K x 36 | (2) 8M x 36 |
66MB | (2) 8M x 36 | (2) 256K x 36 |
68MB | (2) 512K x 36 | (2) 8M x 36 |
68MB | (2) 8M x 36 | (2) 512K x 36 |
72MB | (2) 1M x 36 | (2) 8M x 36 |
72MB | (2) 8M x 36 | (2) 1M x 36 |
DRAM CONFIGURATION (CON’T) | ||
Size | Bank 0 | Bank 1 |
80MB | (2) 2M x 36 | (2) 8M x 36 |
80MB | (2) 8M x 36 | (2) 2M x 36 |
96MB | (2) 4M x 36 | (2) 8M x 36 |
96MB | (2) 8M x 36 | (2) 4M x 36 |
128MB | (2) 8M x 36 | (2) 8M x 36 |
CACHE CONFIGURATION | |||
Size | Bank 0 | Bank 1 | TAG |
128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 16K x 8 |
256KB | (4) 64K x 8 | NONE | (1) 16K x 8 |
512KB | (4) 64K x 8 | (4) 64K x 8 | (1) 32K x 8 |
512KB | (4) 128K x 8 | NONE | (1) 32K x 8 |
1MB | (4) 128K x 8 | (4) 128K x 8 | (1) 64K x 8 |
CACHE JUMPER CONFIGURATION | ||
Size | JP24 | JP26 |
128KB | Open | pins 3 & 5 closed |
256KB | pins 1 & 2 closed | pins 1 & 3 closed |
256KB | pins 1 & 2 closed | pins 3 & 5 closed |
512KB | pins 1 & 2, 3 & 4 closed | pins 2 & 4 closed |
512KB | pins 1 & 2, 3 & 4 closed | pins 3 & 5 closed |
1MB | pins 1 & 2, 3 & 4, 5 & 6 closed | pins 4 & 6 closed |
CPU TYPE CONFIGURATION | |||||
Type | RN1 | RN2 | RN3 | RN4 | RN5 |
Cyrix | Installed | Not installed | Not installed | Installed | Not installed |
AMD | Not installed | Installed | Not installed | Not installed | Installed |
UMC | Not installed | Not installed | Installed | Not installed | Not installed |
Intel | Not installed | Installed | Not installed | Not installed | Installed |
CPU TYPE CONFIGURATION | |
Type | JP8 |
All CPU types | pins 1 & 2 closed |
Intel S-series | pins 2 & 3 closed |
AMD S-series | pins 2 & 3 closed |
CPU TYPE CONFIGURATION | |
Type | JP9 |
All CPU types | Closed |
AMD | Open |
UMC | Open |
CPU TYPE CONFIGURATION | |
Type | JP11 |
80486SX | pins 2 & 3 closed |
80486DX | pins 1 & 2 closed |
CPU TYPE CONFIGURATION | |
Type | JP13 |
All CPU types | Closed |
80486DX4 | Open |
CPU TYPE CONFIGURATION | |
Type | JP5 |
Cyrix | pins 1 & 2, 3 & 4 closed |
AMD | pins 3 & 4, 5 & 6 closed |
UMC | pins 5 & 6, 7 & 8 closed |
Intel | pins 3 & 4, 5 & 6 closed |
CPU SPEED CONFIGURATION | |
Speed | JP15 |
25MHz | pins 1 & 2 closed |
33MHz | pins 1 & 2, 3 & 4, 5 & 6 closed |
40MHz | pins 1 & 2, 3 & 4 closed |
50iMHz | pins 1 & 2 closed |
50MHz | pins 5 & 6 closed |
66iMHz | pins 1 & 2, 3 & 4, 5 & 6 closed |
75iMHz | pins 1 & 2 closed |
100iMHz | pins 1 & 2, 3 & 4, 5 & 6 closed |
CPU SPEED CONFIGURATION (P24D & AM486DX4 ONLY) | |
Speed | JP12 |
2x | pins 2 & 3 closed |
3x | pins 1 & 2 closed |
CPU SPEED CONFIGURATION (80486DX4 ONLY) | |
Speed | JP10 |
2x | Closed |
3x | Open |
CPU VOLTAGE CONFIGURATION | ||
Voltage | JP22 | JP23 |
3.3v | Open | pins 1 & 2 closed |
3.3v (Cyrix only) | Open | pins 2 & 3 closed |
4v | Closed | pins 2 & 3 closed |
5v | Open | pins 1 & 2 closed |