ACER, INC.
486 SYSTEM
|
Processor |
80486SX/80486DX/80486DX2 |
|
Processor Speed |
25/33/50(internal)/66(internal)MHz |
|
Chip Set |
Intel |
|
Max. Onboard DRAM |
36MB |
|
Cache |
64/128/256KB |
|
BIOS |
Phoenix |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
32-bit riser card, floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA feature connector, VGA port |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
VESA control PAL chips |
C1 |
Floppy drive interface |
CN8 |
|
VGA port |
CN1 |
IDE interface |
CN9 |
|
Parallel port |
CN2 |
VGA feature connector |
CN10 |
|
Serial port 1 |
CN3 |
Multifunction connector |
CN11 |
|
Serial port 2 |
CN4 |
Reset switch |
CN12 |
|
PS/2 mouse port |
CN5 |
IDE interface LED |
CN13 |
|
Power controller box connector |
CN6 |
EPA power saving relay |
CN14 |
|
Power saving controller connector |
CN7 |
Riser Card |
SL1 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
|
CMOS memory normal operation |
J2 |
pins 1 & 2 closed |
|
CMOS memory clear |
J2 |
pins 2 & 3 closed | |
|
|
On board battery enabled |
J13 |
Closed |
|
On board battery disabled |
J13 |
Open | |
|
|
DRAM parity disabled |
J14 |
Closed |
|
DRAM parity enabled |
J14 |
Open | |
|
|
On board VGA enabled |
J20 |
pins 1 & 2 closed |
|
On board VGA disabled |
J20 |
pins 2 & 3 closed | |
|
|
Keylock disabled |
J27 |
pins 1 & 2 closed |
|
Keylock enabled |
J27 |
pins 2 & 3 closed | |
|
|
On board memory enabled |
J28 |
pins 1 & 2 closed |
|
On board memory disabled |
J28 |
pins 2 & 3 closed | |
|
|
Floppy/hard drive controller enabled |
J29 |
Closed |
|
Floppy/hard drive controller disabled |
J29 |
Open | |
|
DRAM CONFIGURATION | |||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
|
4MB |
(4) 44256 |
NONE |
NONE |
|
8MB |
(4) 44256 |
(1) 1M x 36 |
NONE |
|
12MB |
(4) 44256 |
(1) 1M x 36 |
(1) 1M x 36 |
|
12MB |
(4) 44256 |
(1) 2M x 36 |
NONE |
|
16MB |
(4) 44256 |
(1) 1M x 36 |
(1) 2M x 36 |
|
20MB |
(4) 44256 |
(1) 4M x 36 |
NONE |
|
20MB |
(4) 44256 |
(1) 2M x 36 |
(1) 2M x 36 |
|
24MB |
(4) 44256 |
(1) 1M x 36 |
(1) 4M x 36 |
|
36MB |
(4) 44256 |
(1) 4M x 36 |
(1) 4M x 36 |
|
Note: Bank 0 and parity chips are factory installed and are non configurable. | |||
|
CACHE CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
TAG (7 bit) |
TAG (8 bit) |
|
64KB |
(4) 8K x 8 |
(4) 8K x 8 |
(1) 8K x 8 |
(1) 16K x 4 |
|
128KB |
(4) 32K x 8 |
NONE |
(1) 8K x 8 |
(1) 16K x 4 |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
(1) 32K x 8 |
(1) 16K x 4 |
|
CACHE JUMPER CONFIGURATION | ||||
|
Size |
J5 |
J6 |
J23 |
J24 |
|
64KB |
pins 2 & 3 closed |
pins 2 & 3 closed |
N/A |
pins 1 & 2 closed |
|
128KB |
pins 1 & 2 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
pins 2 & 3 closed |
|
256KB |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
CACHE JUMPER CONFIGURATION (TAG) | |||
|
Type |
J5 |
J6 |
J24 |
|
Write through |
N/A |
pins 2 & 3 closed |
N/A |
|
Write back/7 bit |
pins 2 & 3 closed |
pins 1 & 2 closed |
Open |
|
Write back/8 bit |
pins 1 & 2 closed |
pins 2 & 3 closed |
Closed |
|
CPU TYPE CONFIGURATION | |||
|
Type |
J9 |
J10 |
J11 |
|
80486SX (PQFP) |
Open |
Closed |
Open |
|
80486SX (PGA) |
Open |
Open |
Open |
|
80487SX |
Open |
Closed |
Closed |
|
80486DX/DX2 |
Closed |
Closed |
Open |
|
CPU SPEED CONFIGURATION | |
|
Speed |
J17 |
|
25MHz |
pins 3 - 7 closed |
|
33MHz |
pins 4 - 8 closed |
|
50iMHz |
pins 2 - 5 closed |
|
66iMHz |
pins 3 - 6 closed |
|
VIDEO MEMORY CONFIGURATION | ||
|
Size |
Bank 0 |
Bank 1 |
|
512KB |
(4) 256K x 4 |
NONE |
|
1MB |
(4) 256K x 4 |
(4) 256K x 4 |
|
Note: Bank 0 is factory installed and is non configurable. | ||