DIGITAL EQUIPMENT CORPORATION
DECPC LP
|
Device Type |
Mainboard |
|
Processor |
80486SX/80486DX/80486DX2 |
|
Processor Speed |
25/33/50(internal)/66(internal)MHz |
|
Chip Set |
OPTI |
|
Video Chip Set |
Unidentified |
|
Maximum Onboard Memory |
64MB |
|
Maximum Video Memory |
1MB |
|
Cache |
64KB |
|
BIOS |
Unidentified |
|
Dimensions |
254mm x 218mm |
|
I/O Options |
Floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), VGA feature connector, 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 2 |
CN3 |
VGA feature connector |
CN8 |
|
Serial port 1 |
CN4 |
CPU board connectors |
CN9 |
|
PS/2 mouse port |
CN5 |
Riser slot |
SL1 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Label |
Position | |
|
» |
VGA IRQ9 disabled |
J1 |
Open |
|
VGA IRQ9 enabled |
J1 |
Closed | |
|
» |
On board video disabled |
J2 |
Open |
|
On board video enabled |
J2 |
Closed | |
|
» |
CMOS memory normal operation |
J3 |
Pins 1 & 2 closed |
|
CMOS memory clear |
J3 |
Pins 2 & 3 closed | |
|
Reset switch enabled |
J4 |
Closed | |
|
Reset switch disabled |
J4 |
Open | |
|
Parallel port unidirectional |
J5 |
Pins 1 & 2 closed | |
|
Parallel port bidirectional |
J5 |
Pins 2 & 3 closed | |
|
» |
Factory configured - do not alter |
J10 |
Open |
|
» |
Monitor type select color |
J11 |
Closed |
|
Monitor type select monochrome |
J11 |
Open | |
|
» |
Factory configured - do not alter |
J29 |
Open |
|
» |
Factory configured - do not alter |
J30 |
Open |
|
» |
Factory configured - do not alter |
J31 |
Open |
|
VGAIOW select local |
J35 |
Pins 1 & 2 closed | |
|
VGAIOW select local & ISA |
J35 |
Pins 2 & 3 closed | |
|
SIMM CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
4MB |
(1) 1M x 36 |
None |
None |
None |
|
8MB |
(1) 2M x 36 |
None |
None |
None |
|
8MB |
(1) 1M x 36 |
(1) 1M x 36 |
None |
None |
|
12MB |
(1) 2M x 36 |
(1) 1M x 36 |
None |
None |
|
12MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
None |
|
SIMM CONFIGURATION (CON’T) | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
12MB |
(1) 1M x 36 |
(1) 2M x 36 |
None |
None |
|
16MB |
(1) 4M x 36 |
None |
None |
None |
|
16MB |
(1) 2M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
None |
|
16MB |
(1) 2M x 36 |
(1) 2M x 36 |
None |
None |
|
16MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
|
20MB |
(1) 4M x 36 |
(1) 1M x 36 |
None |
None |
|
20MB |
(1) 2M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
|
20MB |
(1) 1M x 36 |
(1) 2M x 36 |
(1) 2M x 36 |
None |
|
20MB |
(1) 1M x 36 |
(1) 4M x 36 |
None |
None |
|
24MB |
(1) 4M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
None |
|
24MB |
(1) 4M x 36 |
(1) 2M x 36 |
None |
None |
|
24MB |
(1) 2M x 36 |
(1) 2M x 36 |
(1) 2M x 36 |
None |
|
24MB |
(1) 2M x 36 |
(1) 4M x 36 |
None |
None |
|
28MB |
(1) 4M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
|
32MB |
(1) 8M x 36 |
None |
None |
None |
|
32MB |
(1) 4M x 36 |
(1) 4M x 36 |
None |
None |
|
32MB |
(1) 2M x 36 |
(1) 2M x 36 |
(1) 2M x 36 |
(1) 2M x 36 |
|
36MB |
(1) 8M x 36 |
(1) 1M x 36 |
None |
None |
|
40MB |
(1) 8M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
None |
|
40MB |
(1) 8M x 36 |
(1) 2M x 36 |
None |
None |
|
40MB |
(1) 4M x 36 |
(1) 2M x 36 |
(1) 2M x 36 |
(1) 2M x 36 |
|
40MB |
(1) 2M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
None |
|
40MB |
(1) 2M x 36 |
(1) 8M x 36 |
None |
None |
|
44MB |
(1) 8M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
|
48MB |
(1) 8M x 36 |
(1) 2M x 36 |
(1) 2M x 36 |
None |
|
48MB |
(1) 8M x 36 |
(1) 4M x 36 |
None |
None |
|
48MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
None |
|
48MB |
(1) 4M x 36 |
(1) 8M x 36 |
None |
None |
|
56MB |
(1) 8M x 36 |
(1) 2M x 36 |
(1) 2M x 36 |
(1) 2M x 36 |
|
56MB |
(1) 2M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
|
64MB |
(1) 8M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
None |
|
64MB |
(1) 8M x 36 |
(1) 8M x 36 |
None |
None |
|
64MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
|
VIDEO MEMORY CONFIGURATION |
|
Note: Board accepts 512KB/1MB of video memory. The configuration is unidentified. |
|
VIDEO MEMORY JUMPER CONFIGURATION | |
|
Size |
J28 |
|
512KB |
Pins 1 & 2 closed |
|
1MB |
Pins 2 & 3 closed |
|
CONNECTIONS | |
|
Purpose |
Location |
|
CPU board connectors |
CN9 |
|
CACHE CONFIGURATION | |
|
Size |
Bank 0 |
|
128KB |
(4) 32K x 8 |
|
256KB |
(4) 64K x 8 |
|
CACHE JUMPER CONFIGURATION | ||
|
Size |
J103 |
J104 |
|
128KB |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
|
256KB |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
|
CPU SPEED SELECTION | ||||
|
Speed |
J109 |
J110 |
J111 |
J112 |
|
33MHz |
Closed |
Open |
Open |
Open |
|
66iMHz |
Closed |
Open |
Open |
Open |
|
CPU TYPE SELECTION | ||
|
Type |
J114 |
J115 |
|
80486SX |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
|
80486DX |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
|
CPU SECOND SOCKET SELECTION | |||
|
Setting |
J101 |
J102 |
J103 |
|
Not installed |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
|
ODP486 |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
|
80486DX |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
|
80486DX2 |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
|
CONNECTIONS | |
|
Purpose |
Location |
|
CPU board connectors |
CN9 |
|
CACHE CONFIGURATION | |
|
Size |
Bank 0 |
|
128KB |
(4) 32K x 8 |
|
256KB |
(4) 64K x 8 |
|
CACHE JUMPER CONFIGURATION | ||
|
Size |
J103 |
J104 |
|
128KB |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
|
256KB |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
|
CPU SPEED SELECTION | ||||
|
Speed |
J109 |
J110 |
J111 |
J112 |
|
25MHz |
Closed |
Open |
Open |
Open |
|
50iMHz |
Closed |
Open |
Open |
Open |
|
CPU SECOND SOCKET SELECTION | |||
|
Setting |
J101 |
J102 |
J103 |
|
Not installed |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
|
ODP486 |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
|
80486DX |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
|
80486DX2 |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
Pins 2 & 3 closed |