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Motherboards
| Motherboard | CPU | Memory | Chipset | Cache | PCI | AGP | ISA | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Type | Frequency | Type | Max memory | 64-bit | 32-bit | |||||
| EB64 | 21064/EV4 | 150 MHz | FPM Parity | 64 MiB | None | 128 - 512 KiB | 0 | 0 | 0 | 2 |
| EB64+ | 21064/EV4, 21064A/EV45 | 150 - 275 MHz | FPM Parity | 512 MiB | 21072 | 512 KiB - 2 MiB | 0 | 2 (1 shared) | 0 | 3 (1 shared) |
| EB66 | 21066/LCA4 | 166 MHz | unknown | unknown | None (integrated in CPU) | 256 KiB | 0 | 2 (1 shared) | 0 | 3 (1 shared) |
| EB66+ | 21066A/LCA45 | 233 MHz | FPM Parity (ECC) | 384 MiB | None (integrated in CPU) | 256 KiB - 1 MiB | 0 | 4 (1 shared) | 0 | 5 (1 shared) |
| AXPpci 33 | 21066/LCA4, 21066A/LCA45, 21068, 21068A | 66 - 233 MHz | FPM ECC | 256 MiB | None (integrated in CPU) | 0, 256 KiB, 1 MiB | 0 | 3 (1 shared) | 0 | 5 (1 shared) |
| AlphaPC 64 | 21064A/EV45 | 200, 233, 275 MHz | FPM Parity | 512 MiB | 21072 | 512 KiB - 8 MiB | 0 | 4 (1 shared) | 0 | 3 (1 shared) |
| EB164 | 21164/EV5 | 266, 300, 333 MHz | FPM Parity (ECC) | 512 MiB | 21171 | 2 - 8 MiB | 2 (1 shared) | 2 | 0 | 3 (1 shared) |
| AlphaPC 164 | 21164A/EV56 | 366 - 500 MHz | FPM Parity (ECC) | 512 MiB | 21172 | 1 MiB | 2 | 2 | 0 | 2 |
| AlphaPC 164LX | 21164A/EV56 | 466, 533, 600 MHz | ECC SDRAM | 1024 MiB | 21174 | 2, 4 MiB | 2 | 2 | 0 | 2 |
| AlphaPC 164SX | 21164PC/PCA56 | 400, 533 MHz | SDRAM (ECC optional) | 1024 MiB | 21174 | 1 MiB | 2 | 2 | 0 | 2 |
| AlphaPC 164UX, AlphaPC 164BX | 21164A/EV56 | 466, 533, 600 MHz | ECC SDRAM | 1536 MiB | 21174 | 2, 4 MiB | 1 | 5 | 0 | 1 |
| AlphaPC 164RX | 21164PC/PCA57 | 525, 600 MHz | ECC SDRAM | 512 MiB | VLSI Polaris | 1 MiB | 0 | 5 (1 shared) | 0 | 1 (shared) |
| AlphaPC 264DP | 21264/EV6, 21264A/EV67 | 500, 667 MHz | ECC SDRAM | 4096 MiB | 21272 | 2, 4 MiB | 6 (1 shared) | 0 | 0 | 1 (shared) |
| UP1000 | 21264A/EV67 | 600, 700 MHz | ECC SDRAM | 768 MiB | AMD-751 | 2, 4 MiB | 0 | 4 | 1 | 2 |
| UP1100 | 21264A/EV67 | 600 MHz | ECC SDRAM | 768 MiB | AMD-751 | 2 MiB | 0 | 3 | 1 | 0 |
| UP1500 | 21264B/EV68 | 800 MHz | ECC DDR SDRAM | 4096 MiB | AMD-761 | 2 - 8 MiB | 0 | 3 | 1 | 0 |
| UP2000 | 21264A/EV67 | 667, 750 MHz | ECC SDRAM | 2048 MiB | 21272 | 2 - 8 MiB | 2 | 4 | 0 | 1 |
| UP2000+ | 21264A/EV67, 21264B/EV68 | 667, 750, 833 MHz | ECC SDRAM | 2048 MiB | 21272 | 2 - 8 MiB | 4 | 2 | 0 | 1 |
Form factor, firmware, and Linux
All boards also have PS/2 keyboard and mouse ports. The firmware column lists the consoles available for each board, with the last SRM version where it is known; "or" marks boards whose flash holds only one console at a time.
Boards with EV4, EV45, LCA, or EV5 processors are not supported by Linux 6.10 or later, which requires an EV56 (21164A) or later processor; Linux 6.9 was the last version to support them. 1) The current kernel column uses these values:
- Supported: current kernels support the board.
- Untested: the support code is in current kernels, but no one has reported booting a current kernel, or there is a specific doubt, such as a board that only MILO can boot.
- Linux 6.9 and earlier: the board has a processor older than the EV56 (21164A).
- Removed in year: support was removed before Linux 6.10 for another reason.
- Never: Linux never supported the board.
The AlphaPC 164UX and 164RX can only boot Linux through MILO.
Details and sources are on each board's page.
| Motherboard | Form factor | Onboard I/O | Firmware | Current kernel |
|---|---|---|---|---|
| EB64 | unknown | Am79C960 Ethernet, floppy, 2 serial, keyboard, mouse | Debug monitor, SRM | Removed in 1995 |
| EB64+ | Full-size AT | NCR 53C810 SCSI, 21040 Ethernet, floppy, 2 serial, parallel | ARC 4.49-7, SRM, MILO | Linux 6.9 and earlier |
| EB66 | Baby AT | NCR 53C810 SCSI, 21040 Ethernet, floppy, 2 serial, parallel | ARC, SRM, MILO | Linux 6.9 and earlier |
| EB66+ | Baby AT | IDE, floppy, 2 serial, parallel | SRM, MILO | Linux 6.9 and earlier |
| AXPpci 33 | Baby AT | NCR 53C810 SCSI, IDE, floppy, 2 serial, parallel | ARC, SRM, MILO | Linux 6.9 and earlier |
| AlphaPC 64 | Baby AT | IDE, floppy, 2 serial, parallel | ARC 4.49-7, SRM 4.8, MILO | Linux 6.9 and earlier |
| EB164 | Full-size AT | IDE, floppy, 2 serial, parallel | ARC, SRM 4.8, MILO | Linux 6.9 and earlier |
| AlphaPC 164 | ATX | CMD646 IDE, floppy, 2 serial, parallel | ARC or SRM 5.6, MILO | Supported |
| AlphaPC 164LX | ATX | CMD646 IDE, floppy, 2 serial, parallel | SRM 5.8 or AlphaBIOS, MILO | Supported |
| AlphaPC 164SX | ATX | Cypress IDE, floppy, 2 serial, parallel | SRM 5.8 or AlphaBIOS, MILO | Supported |
| AlphaPC 164UX, 164BX | ATX | EIDE, floppy, 2 serial, parallel; 21143 Ethernet and 53C875 SCSI on the UX | ARCSBIOS, MILO | Untested |
| AlphaPC 164RX | ATX | IDE, 10/100 Ethernet, floppy, 2 serial, parallel, 2 USB | AlphaBIOS, MILO | Untested |
| AlphaPC 264DP | 42.11 x 33.02 cm | AIC-7895 SCSI, IDE, floppy, 2 serial, parallel | SRM, AlphaBIOS | Supported |
| UP1000 | ATX | 2 IDE, floppy, 2 serial, parallel, 2 USB | SRM, AlphaBIOS | Supported |
| UP1100 | ATX | 2 IDE, floppy, 2 serial, parallel, 2 USB, 21143 Ethernet, sound | SRM | Supported |
| UP1500 | ATX | 2 IDE, floppy, 2 serial, parallel, 2 USB, 21143 Ethernet, sound | SRM 5.6-19 | Supported |
| UP2000, UP2000+ | Extended ATX | AIC-7891 SCSI, IDE, floppy, 2 serial, parallel, 2 USB | SRM A5.8-81, AlphaBIOS | Supported |
The EB64+, EB66+, EB164, AXPpci 33, and AlphaPC 64 keep the time in a Dallas DS1287 or DS1287A clock chip that contains a sealed lithium cell, so the whole chip is replaced when the cell is exhausted; the AlphaPC 164, 164LX, 164SX, and 264DP use a replaceable CR2032 coin cell. Details and sources are on each board's page; see also Systems: Common problems.
API NetWorks also announced the UP1700 and UP2700 for 2001, but neither was released.
Digital's VMEbus single-board computers are on the AXPvme and Alpha VME page.
See also Chipsets.
Documentation
These documents apply to Digital's Alpha evaluation boards and motherboards in general.
| Document | Part number | Date |
|---|---|---|
| Alpha Microprocessors Motherboard Debug Monitor User's Guide | EC-QHUVG-TE | April 1999 |
| Alpha Microprocessors SROM Mini-Debugger User's Guide | EC-QHUXD-TE | April 1999 |
| Alpha Microprocessors Motherboard Software Design Tools User's Guide | EC-QHUWE-TE | April 1999 |
| Alpha SRM Console for Alpha Microprocessor Motherboards User's Guide | EC-QK8DF-TE | September 1997 |
| Alpha Microprocessors Motherboard Windows NT 3.51 and 4.0 Installation Guide | EC-QLUAH-TE | October 1997 |
| Alpha Motherboards Software Developer's Kit Version 4.0 Product Brief | EC-QXQKD-TE | April 1999 |
| Alpha Motherboards Software Developer's Kit Read Me First | EC-QERSJ-TE | April 1999 |
| PALcode for Alpha Microprocessors System Design Guide | EC-QFGLC-TE | May 1996 |
| SPICE Models for Alpha Microprocessors: An Application Note | EC-QA4XG-TE | March 1997 |