Ultra Port Architecture

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UPA bus on an Ultra 1 Creator

The Ultra Port Architecture (UPA) bus was developed by Sun Microsystems as a high-speed graphics card to CPU interconnect, beginning with the Ultra 1 workstation in 1995.

External links

UPA Bus Whitepaper

v t e Technical and de facto standards for wired computer buses
General	System bus Front-side bus Back-side bus Daisy chain Control bus Address bus Bus contention Network on a chip Plug and play List of bus bandwidths
Standards	SS-50 bus S-100 bus Unibus VAXBI MBus STD Bus SMBus Q-Bus Europe Card Bus ISA STEbus Zorro II Zorro III CAMAC FASTBUS LPC HP Precision Bus EISA VME VXI VXS NuBus TURBOchannel MCA SBus VLB PCI PXI HP GSC bus CoreConnect InfiniBand UPA PCI Extended (PCI-X) AGP PCI Express (PCIe) Direct Media Interface (DMI) RapidIO Intel QuickPath Interconnect HyperTransport
Storage	ST-506 ESDI SMD Parallel ATA (PATA) SSA DSSI HIPPI Serial ATA (SATA) eSATA eSATAp mSATA SCSI Parallel SCSI SAS Fibre Channel SATA Express M.2
Peripheral	Apple Desktop Bus HIL MIDI Multibus RS-232 RS-422 RS-423 RS-485 DMX512-A IEEE-488 (GPIB) IEEE-1284 (parallel port) UNI/O ACCESS.bus 1-Wire D²B I²C SPI Parallel SCSI Profibus USB IEEE 1394 (FireWire) Camera Link External PCIe Thunderbolt
Audio	ADAT Lightpipe AES3 Intel HD Audio I²S MADI McASP S/PDIF TOSLINK
Portable	PC Card ExpressCard
Embedded	Multidrop bus AMBA Wishbone
Interfaces are listed by their speed in the (roughly) ascending order, so the interface at the end of each section should be the fastest. Category