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The Alpha 21066 and Alpha 21068 Evaluation Board (EB66) is an evaluation board for systems based on the Alpha 21066 and 21068 microprocessors. ^{1) 2)} It reports system type 19 in the HWRPB. ³⁾

The EB66 was Digital's first AT form factor Alpha motherboard, and the Noname (AXPpci 33) is based on revision 1 of its design. ⁴⁾ The EB66+ is the corresponding board for the 21066A.

• 21066 (LCA4) CPU; Digital's 21066 evaluation kit, available from late 1993, contained an example motherboard with a 166 MHz 21066, 32 MiB of memory, PCI and ISA, and embedded NCR SCSI ⁵⁾
• Memory controller, cache controller, and PCI bus integrated into the CPU, which supports up to 512 MiB of DRAM and 2 MiB of cache ⁶⁾
• I/O subsystem identical to the EB64+'s: 3 ISA and 2 PCI slots (one pair shared), NCR 53C810 SCSI and Digital 21040 Ethernet on PCI, an Intel SaturnI/O PCI-to-ISA bridge, a Super I/O controller with 2 serial ports, a parallel port, and a floppy controller, PS/2 style keyboard and mouse, and RTC/NVRAM ⁷⁾
• Baby AT size, running from a standard PC power supply ⁸⁾

The EB66 runs the Windows NT ARC firmware, which resides in a UVPROM. DEC did not supply updated firmware in a UVPROM; to update it, the user programs a UVPROM, replaces one of the UVPROMs on the board, and selects it with the UVPROM select jumper. ⁹⁾

DEC also distributed SRM consoles for the EB66, along with its other evaluation boards, as part of its evaluation board software development kit. ¹⁰⁾

Linux 6.9 was the last version to support the EB66; Linux 6.10 removed support for processors older than the EV56 (21164A). ¹¹⁾ Kernels up to 6.9 support it with CONFIG_ALPHA_EB66 or a generic kernel. ¹²⁾ The MILO image is named eb66. ¹³⁾

In kernels up to 6.9, the onboard devices listed in the kernel's description of the board use these drivers:

• SCSI (NCR 53C810): sym53c8xx. ¹⁴⁾
• Ethernet (DECchip 21040): de2104x; the tulip driver does not list the 21040's PCI ID. ^{15) 16)}
• Serial ports: 8250, at the standard PC addresses listed in the Alpha serial port table. ¹⁷⁾
• Parallel port: parport_pc; floppy: floppy; keyboard and mouse: i8042. ^{18) 19) 20)}

Many mailing list posts use "EB66" to refer to the EB66+, so reports of a given "EB66" do not necessarily apply to this board.