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vaxbi wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 references toggle references subsection 1 1 works cited 2 further reading toggle the table of contents vaxbi 1 language tiếng việt edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikimedia commons wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia bus for vax computers this article needs more citations please help improve this article by adding citations to reliable sources unsourced material may be challenged and removed find sources vaxbi news newspapers books scholar jstor november 2022 learn how and when to remove this message vaxbi vax bus interconnect vax ecc memory card with vaxbi interface highlighted year created 1986 40 years ago 1986 created by digital equipment corporation width in bits 32 vax bi to unibus adapter ethernet and tape drive controller vaxbi vax b us i nterconnect is a computer bus designed and sold by digital equipment corporation dec introduced in 1986 1 the bus is an advanced configuration free synchronous bus used on dec s later vax computers 2 like the unibus and q bus before it it uses memory mapped i o 3 but has 32 bit address and data paths the vaxbi is a multiplexed bus with fully distributed arbitration and geographic addressing 4 all of the logic required to implement a vaxbi interface is contained within a single custom integrated circuit the biic and the physical layout and printed wiring board layout for compliant cards is tightly specified right down to the location of the dual amber status leds that are required the portion of the card that is reserved for the bus interface is referred to as the vaxbi corner 5 vaxbi licensees were given the appropriate engineering drawings to allow them to exactly replicate a compliant card 6 50 vaxbi expansion cards mount into backplanes using a zif connector depending on the backplane design cards can be loaded from the top or the front side of the backplane no cable connections are permitted on the cards all connections are made via three uncommitted rows of backplane connectors similarly no configuration jumpers are permitted on the cards all setup is done by jumpers inserted on the backplane connectors or via software configuration 2 originally conceived by its engineers to be an open bus it was forced to be a tightly licensed bus by digital s marketing and management and was not nearly as successful as had originally been hoped for 7 it is used in the vax 6000 vax 8000 82xx 83xx 85xx 87xx 88xx models 8 and the vax 9000 systems and also on the mips r3000 based decsystem 5800 series a pdp 11 implementation the pdp 11 27 was envisioned but never advanced beyond the concept stage references edit di giacomo 1990 p 4 4 1 2 di giacomo 1990 p 4 9 shah 1991 p 281 di giacomo 1990 p 4 9 4 19 vaxbi designer s notebook pdf digital equipment corporation january 1986 wilson david march 1986 bi bus boosts performance of vax systems digital design 16 3 ubm information 46 50 via gale simpson david december 21 1992 dec mti end bitter licensing dispute digital news review 9 24 reed business information 1 et seq via gale shah 1991 p 2 works cited edit di giacomo joseph 1990 digital bus handbook mcgraw hill isbn 9780070169234 via the internet archive shah jay 1991 vax vms concepts and facilities mcgraw hill isbn 0070563675 via the internet archive further reading edit vaxbi system reference manual pdf digital equipment corporation february 1989 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 bus mastering network on a chip plug and play double data rate quad data rate list of bus bandwidths standards ss 50 bus s 100 bus multibus 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 vpx nubus turbochannel mca sbus vlb hp gsc bus infiniband ethernet upa pci pci extended pci x pxi pci express pcie agp compute express link cxl direct media interface dmi rapidio intel quickpath interconnect nvlink hypertransport infinity fabric intel ultra path interconnect coherent accelerator processor interface capi spacewire storage st 506 esdi sdi ipi smd floppy connector parallel ata pata bus and tag dssi hippi serial ata sata scsi parallel sas escon fibre channel ssa satae pci express via ahci or nvme logical device interface peripheral apple desktop bus atari sio dcb commodore bus hp il hil midi rs 232 rs 422 rs 423 rs 485 lightning dmx512 a ieee 488 gpib ieee 1284 parallel port ieee 1394 firewire uni o 1 wire i 2 c access bus pmbus smbus i3c spi d²b parallel scsi profibus usb camera link external pcie thunderbolt can bus audio adat lightpipe aes3 intel hd audio i 2 s madi mcasp s pdif toslink portable pc card expresscard embedded multidrop bus coreconnect amba axi wishbone slimbus 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 v t e digital equipment corporation key people ken olsen founder and ceo 1957 1992 harlan anderson co founder gordon bell vp of engineering robert palmer ceo 1992 1998 instruction set architectures processors pdp 11 lsi 11 f 11 t 11 j 11 vax v 11 microvax 78032 cvax soc rigel mariah nvax alpha alpha 21064 21066 21068 alpha 21164 21164pc alpha 21264 alpha 21364 alpha 21464 other microprism strongarm computer terminals vt05 1970 gt40 1972 vt50 vt52 1975 vt55 vt62 vt100 1978 vt101 vt102 vt103 vt105 vt131 vt180 vt220 1983 vt240 vt241 vt320 1987 vt330 vt340 vt420 1990 vt1000 1990 vt510 1993 vt520 1994 vt525 operating systems decsys 4k dms cos tops 10 rsx 15 tss 8 os 8 dos 11 rt 11 rsts e rsx 11 ias dsm 11 tops 20 vax vms vaxeln ultrix taos mica ozix digital unix programming languages basic 8 basic plus bliss dibol focal macro 10 macro 11 mumps vax macro digital command language character sets code page 1100 multinational code page 1287 greek code page 1288 turkish hebrew national replacement radix 50 special graphics technical bus standards digital storage systems interconnect massbus q bus standard disk interconnect synchronous backplane interconnect turbochannel unibus vaxbi other hardware decserver dectalk dectape decwriter digital linear tape dynamically redefined character set firefly flip chip module gold key lk201 lk421 mass storage control protocol palcode ra90 rk05 rl02 star coupler system module tu81 related topics advfs altavista compaq cpu wars decnet decus hp interex digital federal credit union dynamic debugging technique fx 32 local area transport maintenance operations protocol on line debugging tool palcode record management services regis sequence and batch language sixel system reference manual systems research center td smp the ultimate entrepreneur vt640 wps 8 computers template category commons retrieved from https en wikipedia org w index php title vaxbi oldid 1317733031 categories computer buses dec hardware computer related introductions in 1986 hidden categories articles with short description short description matches wikidata articles needing additional references from november 2022 all articles needing additional references this page was last edited on 19 october 2025 at 18 41 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents vaxbi 1 language add topic