GIGA-BYTE TECHNOLOGY CO., LTD.
GA-486AM/AMS (REV. 2.20)
|
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 |
250mm 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 1 |
CN1 |
Speaker |
J3 |
|
IDE interface 2 |
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 |
Pins 1 & 2 closed |
|
|
Factory configured - do not alter |
JP18 |
Pins 2 & 3 closed |
|
|
Factory configured - do not alter |
JP19 |
Closed |
|
|
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) 512K x 36 |
(2) 256K x 36 |
|
8MB |
(2) 512K x 36 |
(2) 512K x 36 |
|
8MB |
(2) 1M x 36 |
NONE |
|
10MB |
(2) 1M x 36 |
(2) 256K 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) 2M x 36 |
(2) 256K x 36 |
|
20MB |
(2) 2M x 36 |
(2) 512K 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) 4M x 36 |
(2) 256K x 36 |
|
36MB |
(2) 4M x 36 |
(2) 512K x 36 |
|
40MB |
(2) 4M x 36 |
(2) 1M 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) 8M x 36 |
(2) 256K x 36 |
|
68MB |
(2) 8M x 36 |
(2) 512K x 36 |
|
72MB |
(2) 8M x 36 |
(2) 1M x 36 |
|
80MB |
(2) 8M x 36 |
(2) 2M 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 (A) |
(4) 32K x 8 |
(4) 32K x 8 |
(1) 16K x 8 |
|
256KB (B) |
(4) 64K x 8 |
NONE |
(1) 16K x 8 |
|
512KB (A) |
(4) 64K x 8 |
(4) 64K x 8 |
(1) 32K x 8 |
|
512KB (B) |
(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 (A) |
Pins 1 & 2 closed |
Pins 1 & 3 closed |
|
256KB (B) |
Pins 1 & 2 closed |
Pins 3 & 5 closed |
|
512KB (A) |
Pins 1 & 2, 3 & 4 closed |
Pins 2 & 4 closed |
|
512KB (B) |
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 3 & 4 closed |
|
AMD S-series |
Pins 3 & 4 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 |
JP21 |
JP22 |
|
3.3v |
Open |
Open |
|
4v |
Open |
Closed |
|
5v |
Closed |
Open |