VENTURIS 486 (VER. 2.0) Motherboard Settings and Configuration
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 (CON’T) | |||
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 |
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