DIGITAL EQUIPMENT CORPORATION
PC 3400, PC 5400
Device Type | Mainboard |
Processor | Pentium Pro |
Processor Speed | 150/166/180/200/210/233/240/266MHz |
Chip Set | Intel |
Video Chip Set | ESS |
Maximum Onboard Memory | 192MB (EDO supported) |
Maximum Video Memory | 2MB WRAM |
Cache | 256KB (located on Pentium Pro CPU) |
BIOS | Unidentified |
Dimensions | 254mm x 218mm |
I/O Options (CPU) | Parallel port, PS/2 mouse port, serial ports (2), VGA feature connector, VGA port, VRM connector, USB connectors (2) |
I/O Options (backplane) | 32-bit PCI slots (2), IDE interfaces (2), floppy drive interface, game/MIDI port, parallel port, 100Base-T connector, 10Base-2 connector, audio in - CD-ROM, fax/modem connector |
NPU Options | None |

CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Serial port | CN1 | PS/2 mouse port | CN6 |
Serial port | CN2 | Parallel port | CN7 |
USB connector 1 | CN3 | VGA feature connector | CN8 |
USB connector 2 | CN4 | Video upgrade connectors | CN9 |
VGA port | CN5 | VRM connector | VRM |
USER CONFIGURABLE SETTINGS | |||
Function | Label | Position | |
» | Boot block update disabled | J27 | Pins 1 & 2 closed |
Boot block update enabled | J27 | Pins 2 & 3 closed | |
» | Password disabled | SW1/5 | Off |
Password enabled | SW1/5 | On | |
» | BIOS normal operation | SW1/6 | Off |
BIOS recovery mode | SW1/6 | On | |
» | CMOS memory normal operation | SW1/7 | Off |
CMOS memory clear | SW1/7 | On | |
» | Factory configured - do not alter | SW1/8 | On |
SIMM CONFIGURATION | |||
Size | Bank 0 | Bank 1 | Bank 2 |
8MB | (2) 1M x 36 | None | None |
16MB | (2) 1M x 36 | (2) 1M x 36 | None |
16MB | (2) 2M x 36 | None | None |
24MB | (2) 1M x 36 | (2) 1M x 36 | (2) 1M x 36 |
32MB | (2) 2M x 36 | (2) 2M x 36 | None |
32MB | (2) 4M x 36 | None | None |
48MB | (2) 2M x 36 | (2) 2M x 36 | (2) 2M x 36 |
64MB | (2) 4M x 36 | (2) 4M x 36 | None |
64MB | (2) 8M x 36 | None | None |
96MB | (2) 4M x 36 | (2) 4M x 36 | (2) 4M x 36 |
128MB | (2) 8M x 36 | (2) 8M x 36 | None |
128MB | (2) 16M x 36 | None | None |
136MB | (2) 16M x 36 | (2) 1M x 36 | None |
144MB | (2) 16M x 36 | (2) 1M x 36 | (2) 1M x 36 |
SIMM CONFIGURATION (CON’T) | |||
Size | Bank 0 | Bank 1 | Bank 2 |
144MB | (2) 16M x 36 | (2) 2M x 36 | None |
160MB | (2) 16M x 36 | (2) 2M x 36 | (2) 2M x 36 |
160MB | (2) 16M x 36 | (2) 4M x 36 | None |
192MB | (2) 16M x 36 | (2) 4M x 36 | (2) 4M x 36 |
192MB | (2) 16M x 36 | (2) 8M x 36 | None |
192MB | (2) 8M x 36 | (2) 8M x 36 | (2) 8M x 36 |
CACHE CONFIGURATION |
Note: 256KB cache is located on the Pentium Pro CPU. |
VIDEO MEMORY CONFIGURATION |
Note: 1MB video memory is factory installed and is not configurable. To increase to 2MB, install upgrade module at CN9. |
CPU SPEED SELECTION | ||||||
CPU speed | Clock speed | Multiplier | SW1/1 | SW1/2 | SW1/3 | SW1/4 |
150MHz | 60MHz | 2.5x | Off | Off | On | On |
166MHz | 66MHz | 2.5x | On | Off | On | On |
180MHz | 60MHz | 3x | Off | On | Off | On |
200MHz | 66MHz | 3x | On | On | Off | On |
210MHz | 60MHz | 3.5x | Off | Off | Off | On |
240MHz | 60MHz | 4x | Off | On | On | Off |
233MHz | 66MHz | 3.5x | On | Off | Off | On |
266MHz | 66MHz | 4x | On | On | On | Off |

CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Logic board connectors | CN1 | SCSI interface LED | CN9 |
Video in connector | CN2 | Game/MIDI port | CN10 |
IDE interface 1 | CN3 | Audio in – CD-ROM | CN11 |
IDE interface 2 | CN4 | Fax/modem connector | CN12 |
Floppy drive interface | CN5 | Audio connector | CN13 |
100Base-T connector | CN6 | Control panel connector | CN14 |
10Base-T/10Base-2 connector | CN7 | 32-bit PCI slots | PC1 – PC2 |
Chassis fan power | CN8 | ||