ABIT COMPUTER CORPORATION
PB4 (REV.1.1)
Processor | 80486SX/SL AM486DX/80486DX/CX486DX2/AM486DX2/80486DX2/ CX486DX4/80486DX4/CX M1/P24D/Pentium Overdrive |
Processor Speed | 25/33/40/50(internal)/66(internal)/75(internal)/80(internal)/100(internal)/ 120(internal)MHz |
Chip Set | Unidentified |
Max. Onboard DRAM | 64MB |
Cache | 128/256KB |
BIOS | Award |
Dimensions | 220mm x 220mm |
I/O Options | 32-bit PCI slots (3), floppy drive interface, green PC connector, IDE interfaces (2), parallel port, serial ports (2), PISA slot |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Floppy drive interface | CN1 | Power LED & keylock | JW1 |
Parallel port | CN2 | Speaker | JW2 |
IDE interface 2 | CN3 | Turbo LED | JW3 |
IDE interface 1 | CN4 | Turbo switch | JW4 |
Serial port 2 | J3 | Reset switch | JW5 |
Serial port 1 | J4 | 32-bit PCI slots | PC1 - PC3 |
IDE interface LED | JP16 | PISA slot | SL1 |
External battery | JP18 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Factory configured - do not alter | JP12 | pins 1 & 2 closed |
» | Factory configured - do not alter | JP13 | Open |
» | Factory configured - do not alter | JP14 | Open |
» | CMOS memory normal operation | JP17 | pins 1 & 2 closed |
CMOS memory clear | JP17 | pins 2 & 3 closed | |
Note: The location of jumpers JP12 and JP14 are unidentified. |
DRAM CONFIGURATION | ||
Size | Bank 0 | Bank 1 |
1MB | (1) 256K x 36 | NONE |
2MB | (1) 512K x 36 | NONE |
2MB | (1) 256K x 36 | (1) 256K x 36 |
3MB | (1) 256K x 36 | (1) 512K x 36 |
3MB | (1) 512K x 36 | (1) 256K x 36 |
4MB | (1) 1M x 36 | NONE |
4MB | (1) 512K x 36 | (1) 512K x 36 |
5MB | (1) 256K x 36 | (1) 1M x 36 |
5MB | (1) 1M x 36 | (1) 256K x 36 |
6MB | (1) 512K x 36 | (1) 1M x 36 |
6MB | (1) 1M x 36 | (1) 512K x 36 |
8MB | (1) 2M x 36 | NONE |
8MB | (1) 1M x 36 | (1) 1M x 36 |
9MB | (1) 256K x 36 | (1) 2M x 36 |
9MB | (1) 2M x 36 | (1) 256K x 36 |
10MB | (1) 512K x 36 | (1) 2M x 36 |
10MB | (1) 2M x 36 | (1) 512K x 36 |
12MB | (1) 1M x 36 | (1) 2M x 36 |
12MB | (1) 2M x 36 | (1) 1M x 36 |
16MB | (1) 4M x 36 | NONE |
16MB | (1) 2M x 36 | (1) 2M x 36 |
17MB | (1) 256K x 36 | (1) 4M x 36 |
17MB | (1) 4M x 36 | (1) 256K x 36 |
18MB | (1) 512K x 36 | (1) 4M x 36 |
18MB | (1) 4M x 36 | (1) 512K x 36 |
20MB | (1) 1M x 36 | (1) 4M x 36 |
20MB | (1) 4M x 36 | (1) 1M x 36 |
24MB | (1) 2M x 36 | (1) 4M x 36 |
24MB | (1) 4M x 36 | (1) 2M x 36 |
32MB | (1) 8M x 36 | NONE |
32MB | (1) 4M x 36 | (1) 4M x 36 |
33MB | (1) 256K x 36 | (1) 8M x 36 |
33MB | (1) 8M x 36 | (1) 256K x 36 |
DRAM CONFIGURATION (CON’T) | ||
Size | Bank 0 | Bank 1 |
34MB | (1) 512K x 36 | (1) 8M x 36 |
34MB | (1) 8M x 36 | (1) 512K x 36 |
36MB | (1) 1M x 36 | (1) 8M x 36 |
36MB | (1) 8M x 36 | (1) 1M x 36 |
40MB | (1) 2M x 36 | (1) 8M x 36 |
40MB | (1) 8M x 36 | (1) 2M x 36 |
48MB | (1) 4M x 36 | (1) 8M x 36 |
48MB | (1) 8M x 36 | (1) 4M x 36 |
64MB | (1) 8M x 36 | (1) 8M x 36 |
CACHE CONFIGURATION | ||
Size | Bank 0 | TAG |
128KB | (4) 32K x 8 | (1) 16K or (1) 32K x 8 |
256KB | (4) 64K x 8 | (1) 16K or (1) 32K x 8 |
CACHE JUMPER CONFIGURATION | |
Size | JP3 |
128KB | pins 1 & 2 closed |
256KB | pins 2 & 3 closed |
CPU TYPE CONFIGURATION | |||
Type | JP5 | JP8 | JP9 |
80486SX | Open | Open | Open |
SL AM486DX | pins 2 & 3 closed | Open | pins 1 & 2 closed |
80486DX | Open | Open | Open |
CX486DX2 | pins 1 & 2 closed | Open | pins 2 & 3 closed |
AM486DX2 | Open | Closed | Open |
80486DX2 | Open | Open | Open |
CX486DX4 | pins 1 & 2 closed | Open | pins 2 & 3 closed |
AM486DX4 | Open | Open | Open |
80486DX4 | Open | Open | Open |
CX M1 | pins 2 & 3 closed | Open | pins 1 & 2 closed |
P24D | pins 2 & 3 closed | Open | pins 1 & 2 closed |
P24T | Open | Open | Open |
CPU TYPE CONFIGURATION | |||
Type | RJ1 | RJ2 | RJ3 |
80486SX | pins 1 - 8 closed | Installed | Not installed |
SL AM486DX | pins 3 - 10 closed | Installed | Not installed |
80486DX | pins 1 - 8 closed | Installed | Not installed |
CX486DX2 | pins 1 - 8 closed | Not installed | Installed |
AM486DX2 | pins 1 - 8 closed | Installed | Not installed |
80486DX2 | pins 1 - 8 closed | Installed | Not installed |
CX486DX4 | pins 1 - 8 closed | Not installed | Installed |
AM486DX4 | pins 1 - 8 closed | Installed | Not installed |
80486DX4 | pins 1 - 8 closed | Installed | Not installed |
CX M1 | pins 1 - 8 closed | Installed | Not installed |
P24D | pins 3 - 10 closed | Installed | Not installed |
P24T | pins 7 - 14 closed | Installed | Not installed |
Note: Pins designated should be in the closed position. |
CPU SPEED CONFIGURATION | ||
Speed | JP4 | JP11 |
25MHz | Open | Open |
33MHz | Closed | Closed |
40MHz | Closed | Open |
50iMHz | Open | Open |
66iMHz | Closed | Closed |
75iMHz | Open | Open |
80iMHz | Closed | Open |
100iMHz | Closed | Closed |
120iMHz | Closed | Open |
CPU VOLTAGE CONFIGURATION | ||
Voltage | JP1 | JP2 |
3.45v | pins 1 & 2 closed | pins 2 & 3 closed |
3.6v | pins 2 & 3 closed | pins 2 & 3 closed |
4v | pins 4 & 5 closed | pins 2 & 3 closed |
5v | pins 1 & 2 closed | pins 1 & 2 closed |