DIGITAL EQUIPMENT CORPORATION
VENTURIS 486 (VER. 2.0)
|
Device Type |
Mainboard |
|
Processor |
AM486DX2/P24D/P24T |
|
Processor Speed |
25/33/40/50(internal)/66(internal)MHz |
|
Chip Set |
Unidentified |
|
Video Chip Set |
S3 |
|
Maximum Onboard Memory |
68MB |
|
Maximum Video Memory |
1MB |
|
Cache |
128/256KB |
|
BIOS |
Phoenix |
|
Dimensions |
254mm x 218mm |
|
I/O Options |
Floppy drive interface, IDE interfaces (2), parallel port, PS/2 mouse port, serial ports (2), VGA port, riser slot |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
VGA port |
CN1 |
Floppy drive interface |
CN6 |
|
Serial port |
CN2 |
IDE interface |
CN7 |
|
Serial port |
CN3 |
IDE interface |
CN8 |
|
Parallel port |
CN4 |
Riser slot |
SL1 |
|
PS/2 mouse port |
CN5 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Label |
Position | |
|
|
Write through enabled |
J1 |
Closed |
|
Write back enabled |
J1 |
Open | |
|
|
Snoop select enabled |
J18 |
Pins 1 & 2 closed |
|
Snoop select disabled |
J18 |
Pins 2 & 3 closed | |
|
|
On board video enabled |
J19 |
Pins 2 & 3 closed |
|
On board video disabled |
J19 |
Pins 1 & 2 closed | |
|
|
Recovery mode normal operation |
J21 |
Open |
|
Recovery mode enabled |
J21 |
Closed | |
|
|
Password normal operation |
J23 |
Open |
|
Password clear |
J23 |
Closed | |
|
|
Factory configured - do not alter |
SL2 |
Unidentified |
|
SIMM CONFIGURATION | |||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
|
4MB |
4MB |
None |
None |
|
8MB |
4MB |
(1) 1M x 36 |
None |
|
12MB |
4MB |
(1) 1M x 36 |
(1) 1M x 36 |
|
12MB |
4MB |
(1) 2M x 36 |
None |
|
16MB |
4MB |
(1) 1M x 36 |
(1) 2M x 36 |
|
20MB |
4MB |
(1) 2M x 36 |
(1) 2M x 36 |
|
20MB |
4MB |
(1) 4M x 36 |
None |
|
24MB |
4MB |
(1) 1M x 36 |
(1) 4M x 36 |
|
28MB |
4MB |
(1) 2M x 36 |
(1) 4M x 36 |
|
36MB |
4MB |
(1) 4M x 36 |
(1) 4M x 36 |
|
36MB |
4MB |
(1) 8M x 36 |
None |
|
SIMM CONFIGURATION (CONT) | |||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
|
40MB |
4MB |
(1) 1M x 36 |
(1) 8M x 36 |
|
44MB |
4MB |
(1) 2M x 36 |
(1) 8M x 36 |
|
52MB |
4MB |
(1) 4M x 36 |
(1) 8M x 36 |
|
68MB |
4MB |
(1) 8M x 36 |
(1) 8M x 36 |
|
Note: Bank 0 is factory installed and is not configurable. The location is unidentified. | |||
|
CACHE CONFIGURATION | ||
|
Size |
Bank 0 |
Bank 1 |
|
128KB |
(4) 32K x 8 |
None |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
|
Note: The location of the cache is unidentified. | ||
|
CACHE JUMPER CONFIGURATION | ||
|
Size |
J2 |
J4 |
|
128KB |
Pins 1 & 2 closed |
Pins 1 & 2 closed |
|
256KB |
Pins 2 & 3 closed |
Pins 2 & 3 closed |
|
VIDEO MEMORY CONFIGURATION |
|
Note: Board is factory installed with 1MB cache. The location is unidentified. |
|
CPU SPEED SELECTION | ||
|
Speed |
J14 |
J15 |
|
25MHz |
Open |
Open |
|
33MHz |
Open |
Closed |
|
40MHz |
Closed |
Open |
|
50iMHz |
Open |
Open |
|
66iMHz |
Open |
Closed |
|
CPU TYPE SELECTION | ||
|
Type |
J9 |
J35 |
|
AM486DX2 |
Pins 2 & 3 closed |
Closed |
|
P24D |
Pins 1 & 2 closed |
Open |
|
P24T |
Pins 1 & 2 closed |
Open |