DIGITAL EQUIPMENT CORPORATION
DIGITAL 21164
Processor | Alpha |
Processor Speed | 266/300/333MHz |
Chip Set | DEC |
Video Chip Set | None |
Maximum Onboard Memory | 512MB |
Maximum Video Memory | None |
Cache | 2048/4096/8192KB |
BIOS | Unidentified |
Dimensions | 332mm x 307mm |
I/O Options | 64-bit PCI slots (2), 32-bit PCI slots (2), floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial ports (2), cache slots (2) |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Chassis fan power | J2/pins 3 & 5 | Serial port 1 | J27 |
Chassis fan power | J2/pins 7 & 9 | IDE interface | J28 |
Halt connector | J2/pins 8 & 10 | Floppy drive interface | J31 |
Chassis fan power | J2/pins 11 & 13 | Parallel port | J33 |
Reset switch | J2/pins 12 & 14 | PS/2 mouse port | J34 |
IDE interface LED | J2/pins 15 & 17 | 64-bit PCI slots | PC1 & PC2 |
Keylock | J2/pins 18 & 20 | 32-bit PCI slots | PC3 & PC4 |
Speaker | J2/pins 19,21,23,25 | Cache slot | SL1 |
Serial port 2 | J26 | Cache slot | SL2 |
USER CONFIGURABLE SETTINGS | |||
Function | Label | Position | |
» | Factory configured - do not alter | J1/pins 9 & 10 | N/A |
» | SROM test disabled | J1/pins 23 & 24 | Open |
SROM test enabled | J1/pins 23 & 24 | Closed | |
» | Loaded image select alternate images loaded | J1/pins 25 & 26 | Closed |
Loaded image select first image loaded | J1/pins 25 & 26 | Open | |
» | Cache speed select nominal read speed | J1/pins 29 & 30 | Open |
Cache speed select read speed 1 cycle faster | J1/pins 29 & 30 | Closed | |
» | Factory configured - do not alter | J1/pins 31 & 32 | N/A |
» | Factory configured - do not alter | J1/pins 33 & 34 | N/A |
» | Factory configured - do not alter | J1/pins 35 & 36 | N/A |
» | Factory configured - do not alter | J1/pins 37 & 38 | N/A |
» | Factory configured - do not alter | J1/pins 39 & 40 | N/A |
» | SROM test connector | J13 | N/A |
» | Flash BIOS write protect disabled | J14 | Pins 2 & 3 closed |
Flash BIOS write protect enabled | J14 | Pins 1 & 2 closed |
DRAM CONFIGURATION | ||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
32MB | (2) 1M x 36 | (2) 1M x 36 | (2) 1M x 36 | (2) 1M x 36 |
64MB | (2) 2M x 36 | (2) 2M x 36 | (2) 2M x 36 | (2) 2M x 36 |
128MB | (2) 4M x 36 | (2) 4M x 36 | (2) 4M x 36 | (2) 4M x 36 |
256MB | (2) 8M x 36 | (2) 8M x 36 | (2) 8M x 36 | (2) 8M x 36 |
512MB | (2) 16M x 36 | (2) 16M x 36 | (2) 16M x 36 | (2) 16M x 36 |
CACHE CONFIGURATION | ||
Size | SL1 | SL2 |
2MB | 2MB | None |
4MB | 4MB | None |
8MB | 4MB | 4MB |
Note: The sizes of the cache modules are unidentified. |
CACHE JUMPER CONFIGURATION | |||
Size | J1/pins 11 & 12 | J1/pins 13 & 14 | J1/pins 15 & 16 |
2MB | Closed | Open | Open |
4MB | Open | Closed | Closed |
8MB | Open | Closed | Open |
CACHE ADDRESS CONFIGURATION | |||
Size | J15 | J16 | J17 |
2MB | Pins 1 & 2 closed | Pins 2 & 3 closed | Pins 2 & 3 closed |
4MB | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 2 & 3 closed |
8MB | Pins 1 & 2 closed | Pins 1 & 2 closed | Pins 1 & 2 closed |
CACHE SPEED CONFIGURATION | ||||
Speed | J1/pins 17 & 18 | J1/pins 19 & 20 | J1/pins 21 & 22 | |
6ns | Closed | Closed | Open | |
8ns | Closed | Open | Closed | |
» | 10ns | Closed | Open | Open |
12ns | Open | Closed | Closed | |
15ns | Open | Closed | Open |
CPU DIVISOR SELECTION | ||||
Divisor | J1/pins 1 & 2 | J1/pins 3 & 4 | J1/pins 5 & 6 | J1/pins 7 & 8 |
3 | Closed | Closed | Open | Open |
4 | Closed | Open | Closed | Closed |
5 | Closed | Open | Closed | Open |
6 | Closed | Open | Open | Closed |
7 | Closed | Open | Open | Open |
8 (266MHz) | Open | Closed | Closed | Closed |
9 (300MHz) | Open | Closed | Closed | Open |
10 (333MHz) | Open | Closed | Open | Closed |
11 | Open | Closed | Open | Open |
12 | Open | Open | Closed | Closed |
13 | Open | Open | Closed | Open |
14 | Open | Open | Open | Closed |
15 | Open | Open | Open | Open |