INTEL CORPORATION
R486SX254F/R486SX33F/R486DX334F/R486DX2664F
|
Processor |
80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive |
|
Processor Speed |
25/33/50(internal)/66(internal)MHz |
|
Chip Set |
VLSI |
|
Max. Onboard DRAM |
32MB |
|
Cache |
64/128/256KB |
|
BIOS |
Phoenix |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
32-bit proprietary riser card slot, floppy drive interface,IDE interface, parallel port, PS/2 mouse port,serial ports (2), VGA feature connector, VGA port |
|
NPU Options |
None |
|
CONNECTIONS |
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|
Purpose |
Location |
Purpose |
Location |
|
VGA port |
J1 |
Floppy drive interface |
J15 |
|
Parallel port |
J2 |
+5V auxiliary fan power |
J26 |
|
Serial port 2 |
J3 |
IDE interface LED |
J29 |
|
Serial port 1 |
J4 |
Power LED & Keylock |
J30 |
|
PS/2 mouse port |
J5 |
Reset switch |
J31 |
|
32 Bit proprietary riser card |
J7 |
+12V auxiliary fan power |
J32 |
|
VGA feature connector |
J10 |
External speaker |
J33 |
|
IDE interface |
J14 |
|
|
|
Note:To connect an external speaker, remove the jumper from pins 3 & 4 and connect external speaker between pins 1 & 4. |
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USER CONFIGURABLE SETTINGS |
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|
Function |
Jumper |
Position |
|
|
|
FLASH BIOS programming enabled |
J12 |
pins 1 & 2 closed |
|
|
FLASH BIOS programming disabled |
J12 |
pins 2 & 3 closed |
|
|
Normal FLASH operation |
J13 |
pins 1 & 2 closed |
|
|
Invoke boot block recovery |
J13 |
pins 2 & 3 closed |
|
|
Enable onboard video |
J16 |
pins 1 & 2 closed |
|
|
Disable onboard video |
J16 |
pins 2 & 3 closed |
|
|
Disable floppy drive write protect |
J17 |
pins 2 & 3 closed |
|
|
Enable floppy drive write protect |
J17 |
pins 1 & 2 closed |
|
|
Enable password |
J20 |
pins 2 & 3 closed |
|
|
Disable password |
J20 |
pins 1 & 2 closed |
|
|
Enable user to enter Setup |
J21 |
pins 1 & 2 closed |
|
|
Prevent user to enter Setup |
J21 |
pins 2 & 3 closed |
|
|
CMOS normal operation |
J28 |
Closed |
|
|
CMOS clear upon power-up |
J28 |
Open |
|
DRAM CONFIGURATION |
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|
Size |
Bank 0 |
Bank 1 |
|
2MB |
(1) 512K x 36 |
NONE |
|
4MB |
(1) 512K x 36 |
(1) 512K x 36 |
|
4MB |
(1) 1M x 36 |
NONE |
|
6MB |
(1) 512K x 36 |
(1) 1M x 36 |
|
6MB |
(1) 1M x 36 |
(1) 512K x 36 |
|
8MB |
(1) 1M x 36 |
(1) 1M x 36 |
|
8MB |
(1) 2M x 36 |
NONE |
|
10MB |
(1) 2M x 36 |
(1) 512K x 36 |
|
10MB |
(1) 512K x 36 |
(1) 2M x 36 |
|
12MB |
(1) 2M x 36 |
(1) 1M x 36 |
|
16MB |
(1) 1M x 36 |
(1) 2M x 36 |
|
16MB |
(1) 2M x 36 |
(1) 2M x 36 |
|
16MB |
(1) 4M x 36 |
NONE |
|
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) 4M x 36 |
(1) 4M x 36 |
|
CACHE CONFIGURATION |
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|
Size |
Bank 0 |
Bank 1 |
TAG |
|
64KB |
(4) 8K x 8 |
(4) 8K x 8 |
(1) 32K x 8 |
|
128KB |
(4) 32K x 8 |
NONE |
(1) 32K x 8 |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
(1) 32K x 8 |
|
CACHE JUMPER CONFIGURATION |
|
|
Size |
J11 |
|
64KB |
Open |
|
128KB |
pins 1 & 2, 5 & 6 closed |
|
256KB |
pins 1 & 2, 3 & 4, 7 & 8 closed |
|
CPU TYPE CONFIGURATION |
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|
CPU Type |
J22 |
J23 |
J24 |
J25 |
|
80486SX |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
80487SX |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 1 & 2 closed |
|
80486DX |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
80486DX2 |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
ODP486SX |
pins 2 & 3 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 1 & 2 closed |
|
CPU SPEED CONFIGURATION |
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|
CPU Speed |
J18 |
J19 |
|
25MHz |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
33MHz |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
50iMHz |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
66iMHz |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
VRAM CONFIGURATION |
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|
Size |
Bank 0 |
Bank 1 |
|
512K |
(4) 256 x 4 |
NONE |
|
1MB |
(4) 256 x 4 |
(4) 256 x 4 |