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<html><body><a href="doc091.html"><img src=../icons/next.gif alt="Next"></a><a href="doc000.html"><img src=../icons/up.gif alt="Up"></a><a href="doc089.html"><img src=../icons/previous.gif alt="Previous"></a><a href="doc000.html"><img src=../icons/contents.gif alt="Contents"></a><a href="doc123.html"><img src=../icons/index.gif alt="Index"></a><hr><h2><a name="sC.7">C.7 The Systems</a></h2><title>The Systems</title><p> The applications engineering group in DS produces example designs using theCPUs and support chipsets. These are typically PC-AT size motherboards, withall the functionality that you'd typically find on a high-end Pentiummotherboard. Originally, these example designs were intended to be used asstarting points for third-parties to produce motherboard designs from. Thesefirst-generation designs were called Evaluation Boards (EBs). As theamount of engineering required to build a motherboard has increased (due tohigher-speed clocks and the need to meet RF emission and susceptibilityregulations) the emphasis has shifted towards providing motherboards thatare suitable for volume manufacture.<p> Digital's system groups have produced several generations of machines usingAlpha processors. Some of these systems use support logic that is designed bythe systems groups, and some use commodity chipsets from DS. In some cases,systems use a combination of both.<p> Various third-parties build systems using Alpha processors. Some of thesecompanies design systems from scratch, and others use DS support chipsets,clone/modify DS example designs or simply package systems using build andtested boards from DS. <p> The EB64: Obsolete design using 21064 with memory controller implementedusing programmable logic. I/O provided by using programmable logic to interfacea 486 <tt><</tt>-<tt>></tt> ISA bridge chip. On-board Ethernet, SuperI/O (2S, 1P, FD), Ethernet and ISA. PC-AT size. Runs from standard PC power supply.<p> The EB64+: Uses 21064 or 21064A and APECs. Has ISA and PCI expansion (3ISA, 2 PCI, one pair are on a shared slot). Supports 36-bit DRAM SIMs. ISA busgenerated by Intel SaturnI/O PCI-ISA bridge. On-board SCSI (NCR 810 on PCI)Ethernet (Digital 21040), KBD, MOUSE (PS2 style), SuperI/O (2S, 1P, FD),RTC/NVRAM. BootROM is EPROM. PC-AT size. Runs from standard PC power supply.<p> The EB66: Uses 21066 or 21066A. I/O sub-system is identical to EB64+. BabyPC-AT size. Runs from standard PC power supply. The EB66 schematic waspublished as a marketing poster advertising the 21066 as ``the firstmicroprocessor in the world with embedded PCI'' (for trivia fans: there areactually 2 versions of this poster - I drew the circuits and wrote the spielfor the first version, and some Americans mauled the spiel for the secondversion)<p> The EB164: Uses 21164 and ALCOR. Has ISA and PCI expansion (3 ISA slots,2 64-bit PCI slots (one is shared with an ISA slot) and 2 32-bit PCI slots.Uses plus-in Bcache SIMMs. I/O sub-system provides SuperI/O (2S, 1P, FD),KBD, MOUSE (PS2 style), RTC/NVRAM. Boot ROM is Flash. PC-AT-sized motherboard.Requires power supply with 3.3V output.<p> The AlphaPC64 (aka Cabriolet): derived from EB64+ but now baby-ATwith Flash boot ROM, no on-board SCSI or Ethernet. 3 ISA slots, 4 PCIslots (one pair are on a shared slot), uses plug-in Bcache SIMMs. Requires power supply with 3.3V output.<p> The AXPpci33 (aka NoName), is based on the EB66. This design is produced byDigital's Technical OEM (TOEM) group. It uses the 21066 processor running at166MHz or 233MHz. It is a baby-AT size, and runs from a standard PC powersupply. It has 5 ISA slots and 3 PCI slots (one pair are a shared slot). Thereare 2 versions, with either PS/2 or large DIN connectors for the keyboard.<p> Other 21066-based motherboards: most if not all other 21066-basedmotherboards on the market are also based on EB66 - there's really not manysystem options when designing a 21066 system, because all the control is doneon-chip.<p> Multia (aka the Universal Desktop Box): This is a very compactpedestal desktop system based on the 21066. It includes 2 PCMCIAsockets, 21030 (TGA) graphics, 21040 Ethernet and NCR 810 SCSI diskalong with floppy, 2 serial ports and a parallel port. It has limitedexpansion capability (one PCI slot) due to its compact size. (There issome restriction on when you can use the PCI slot, can't rememberwhat) (Note that 21066A-based and Pentium-based Multia's are alsoavailable).<p> DEC PC 150 AXP (aka Jensen): This is a very old Digital system - one of thefirst-generation Alpha systems. It is only mentioned here because a number ofthese systems seem to be available on the second-hand market. The Jensen is afloor-standing tower system which used a 150MHz 21064 (later versions usedfaster CPUs but I'm not sure what speeds). It used programmable logic tointerface a 486 EISA I/O bridge to the CPU. <p> Other 21064(A) systems: There are 3 or 4 motherboard designs around (I'mnot including Digital <em>systems</em> here) and all the ones I know ofare derived from the EB64+ design. These include:<p><ul><p><li>EB64+ (some vendors package the board and sell it unmodified); ATform-factor.<p><li>Aspen Systems motherboard: EB64+ derivative; baby-AT form-factor.<p><li>Aspen Systems server board: many PCI slots (includes PCI bridge).<p><li>AlphaPC64 (aka Cabriolet), baby AT form-factor.<p></ul><p> Other 21164(A) systems: The only one I'm aware of that isn't simplyan EB164 clone is a system made by DeskStation. That system is implementedusing a memory and I/O controller proprietary to Desk Station. I don't knowwhat their attitude towards Linux is.<p><p><hr><a href="doc091.html"><img src=../icons/next.gif alt="Next"></a><a href="doc000.html"><img src=../icons/up.gif alt="Up"></a><a href="doc089.html"><img src=../icons/previous.gif alt="Previous"></a><a href="doc000.html"><img src=../icons/contents.gif alt="Contents"></a><a href="doc123.html"><img src=../icons/index.gif alt="Index"></a><hr></body></html>?? 快捷鍵說明
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