DIGITAL EQUIPMENT CORPORATION
DECPC LPV, DECPC LPV+
|
Processor |
80486SX/80486DX/80486DX2 |
|
Processor Speed |
25/33/40/50(internal)/50/66(internal)MHz |
|
Chip Set |
Unidentified |
|
Video Chip Set |
None |
|
Maximum Onboard Memory |
64MB |
|
Maximum Video Memory |
None |
|
Cache |
128/256KB |
|
BIOS |
Unidentified |
|
Dimensions |
254mm x 218mm |
|
I/O Options |
Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA port, riser slot |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
VGA port |
CN1 |
IDE interface |
CN6 |
|
Parallel port |
CN2 |
Floppy drive interface |
CN7 |
|
Serial port |
CN3 |
Front panel connector |
CN8 |
|
Serial port |
CN4 |
Cache slot |
SL1 |
|
PS/2 mouse port |
CN5 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Label |
Position | |
|
» |
Reset switch enabled |
J9 |
Closed |
|
Reset switch disabled |
J9 |
Open | |
|
» |
RDY signal select VLRDY >CPURDY (connects through CPU bus) |
J10 |
Pins 1 & 2 closed |
|
RDY signal select VLRDY >CPURDY (synchronized through chipset) |
J10 |
Pins 2 & 3 closed | |
|
» |
On board video enabled |
J23 |
Pins 1 & 2 closed |
|
On board video disabled |
J23 |
Pins 2 & 3 closed | |
|
» |
VGA IRQ9 disabled |
J25 |
Open |
|
VGA IRQ9 enabled |
J25 |
Closed | |
|
» |
Flash BIOS normal operation |
J27 |
Open |
|
Flash BIOS recovery mode |
J27 |
Closed | |
|
» |
Factory configured - do not alter |
J28 |
Open |
|
» |
Monitor type select monochrome |
J29 |
Open |
|
Monitor type select color |
J29 |
Closed | |
|
DRAM CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
4MB |
(1) 1M x 36 |
None |
None |
None |
|
8MB |
(1) 1M x 36 |
(1) 1M x 36 |
None |
None |
|
12MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
None |
|
16MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
|
16MB |
(1) 4M x 36 |
None |
None |
None |
|
20MB |
(1) 1M x 36 |
(1) 4M x 36 |
None |
None |
|
24MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 4M x 36 |
None |
|
32MB |
(1) 4M x 36 |
(1) 4M x 36 |
None |
None |
|
40MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
|
48MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
None |
|
64MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
|
CACHE CONFIGURATION | |||
|
Size |
Bank 0 |
Bank 1 |
TAG |
|
128KB |
(4) 32K x 8 |
None |
Unidentified |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
Unidentified |
|
CACHE JUMPER CONFIGURATION | ||||
|
Size |
J3 |
J4 |
J6 |
J7 |
|
None |
Open |
Open |
Open |
Open |
|
128KB |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
|
256KB |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
|
CPU SPEED SELECTION | |||
|
Speed |
J18 |
J19 |
J20 |
|
25MHz |
Open |
Closed |
Closed |
|
33MHz |
Closed |
Open |
Closed |
|
40MHz |
Closed |
Open |
Open |
|
50iMHz |
Open |
Closed |
Closed |
|
50MHz |
Open |
Open |
Open |
|
66iMHz |
Closed |
Open |
Closed |
|
CPU TYPE SELECTION | ||
|
Type |
J11 |
J12 |
|
80486SX |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
|
80486DX |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
|
80486DX2 |
Pins 1 & 2 closed |
Pins 1 & 2 closed |