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zorro iii 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 details 2 memory map 3 physical 4 see also 5 references 6 external links toggle the table of contents zorro iii 3 languages español magyar русский 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 wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia amiga 3000 expansion bus this article relies excessively on references to primary sources please improve this article by adding secondary or tertiary sources find sources zorro iii news newspapers books scholar jstor january 2019 learn how and when to remove this message the zorro iii is a computer bus specification introduced in 1990 with the amiga 3000 as an expansion bus it is used to attach peripheral devices to an amiga motherboard designed by commodore international lead engineer dave haynie the 32 bit zorro iii replaced the 16 bit zorro ii bus used in the amiga 2000 as with the zorro ii bus zorro iii allows for true plug and play autodetection similar to and prior to the pc s pci bus wherein devices are dynamically allocated the resources they need on boot details edit zorro iii continued zorro ii s direct memory mapped address design unlike 80x86 processors the mc68k family used in the amiga does not have a separate i o address mechanism just as with zorro ii on 24 bit systems zorro iii reserves a large chunk of 32 bit real memory address space for large memory mapped cards a smaller chunk with smaller allocation granularity for i o type board zorro iii was never supported on 24 bit address or 16 bit data devices it requires a full 32 bit cpu the cpu can directly address any zorro iii device as memory so zorro memory expansions could be made and were made as well as it being possible to use video memory on a video card to be as system ram as an asynchronous bus zorro iii specifies bus cycles of set lengths during which a transaction conforming to the specifications of the bus can be carried out the initial implementation of zorro iii was in commodore s fat buster bus controller gate array assisted by a very high speed pal and numerous ttl buffer chips for bus buffering isolation and multiplexing the amiga 4000 implementation is fundamentally the same but integrates a second gate array to replace the ttl buffers the buster chip provides bus arbitration translation between the mc68030 bus protocols and either zorro ii or zorro iii bus cycles geographically mapped based on the zorro bus address and a vectored interrupt mechanism generally not used zorro ii bus masters are legal bus hogs but zorro iii devices are fairly arbitrated and have controller limited bus tenure despite being a 32 bit bus zorro iii uses the same 100 way slot and edge connector as zorro ii the extra address and data lines are provided by multiplexing some of the existing connections with the nature of the lines changing at different stages of the bus access cycle e g address becoming data however the bus is not fully multiplexed the lower 8 bits of address are available during data cycles which allows zorro iii to support a fast burst cycle in page mode properly designed zorro ii expansion cards can coexist with zorro iii cards it is not a requirement of a zorro iii bus master to support dma access to zorro ii bus targets cards can detect a zorro iii vs zorro ii backplane allowing certain zorro iii cards to function when connected to the older zorro ii bus though at zorro ii s reduced data rates the zorro iii bus has a theoretical bandwidth of 150 mbyte s based on an ideal zorro iii master and slave device running with minimum setup and hold times 1 2 3 the real transfer speed between the amiga 3000 4000 implementation of zorro iii and a zorro iii card is somewhere around 13 5 mbyte s due to the limitations of the buster chip 4 this was comparable to intel s first pci implementation which peaked at 25 mbyte s zorro iii was optimized for future single chip implementations of the protocol but the resources available at commodore in 1990 limited the initial implementation this is also the limiting factor with third party amiga pci expansion boards like e g elbox mediator pci or the matay prometheus pci about 12 mbyte s pci to 68k system dma transfers between two zorro iii cards or pci cards on an pci expansion board can be much faster 5 memory map edit address size mbyte description 0x0000 0000 2 0 chip memory 0x0020 0000 8 0 zorro ii memory expansion space 0x00a0 0000 1 5 zorro ii i o expansion space 0x00b8 0000 3 0 a2000 motherboard register space 0x00e8 0000 0 5 zorro ii i o 0x00f0 0000 1 0 motherboard rom 0x0100 0000 112 0 a3000 motherboard space 0x0800 0000 128 0 32 bit memory expansion space 0x1000 0000 1792 0 zorro iii expansion space 6 0x8000 0000 2032 0 reserved 0xff00 0000 64 kb zorro iii configuration unit 0xff01 0000 16 0 reserved 7 0xffff ffff physical edit the physical connector is a standard 2 5 mm 0 1 in spaced card edge connector with 2 50 rows of pins 8 power volt ampere 0 5 2 0 0 5 0 3 12 8 0 12 0 3 6 see also edit amiga portal list of interface bit rates computer buses references edit dave haynie designer of the zorro iii bus claims in this posting that the theoretical max of the zorro iii bus can be derived by the timing information given in chapter 5 of the zorro iii technical specification archived 2012 07 16 at the wayback machine dave haynie designer of the zorro iii bus claims in this posting that zorro iii is an asynchronous bus and with that does not have a classical mhz rating a maximum theoretical mhz value may be derived by examining timing constraints detailed in the zorro iii technical specification archived 2012 07 16 at the wayback machine which should yield about 37 5 mhz no existing implementation performs to this level dave haynie designer of the zorro iii bus claims in this posting that zorro iii has a max burst rate of 150 mb s amiga org post by michael boehmer on real life zorro iii speed archived from the original on 2012 02 29 retrieved 2013 03 19 czex com prometheus faq 1 2 haynie dave 20 march 1991 the zorro iii bus specification pdf commodore amiga inc archived from the original pdf on 16 july 2012 retrieved 4 january 2008 090430 thule no p16 fig1 1 the amiga 3000 system specification an enhanced amiga 3000 family computer document revision 0 6 1991 devcon release by dave haynie july 17 1991 copyright 1991 commodore amiga inc pdf archived from the original pdf on july 16 2012 retrieved may 1 2009 090501 thule no p14 replacement zorro slots english amiga board 090501 eab abime net external links edit the zorro iii bus specification pdf thule no amiga hardware database descriptions and photos of zorro iii cards amiga resource cx the big book of amiga hardware amigahardware mariomisic de v t e amiga hardware history amiga models 1000 500 500 plus 600 1200 1500 2000 2500 3000 3000t 3000ux 4000 4000t cd32 cdtv amigaone models amigaone amigaone 500 amigaone x1000 amigaone x5000 unofficial 68k models minimig natami unofficial ppc models pegasos efika sam440ep sam440ep flex sam460ex sam460ex lite amiga prototypes walker power a5000 amiga chipsets original chip set ocs ranger chipset enhanced chip set ecs advanced graphics architecture aga amiga advanced architecture chipset aaa commodore aa chipset amiga hombre chipset amiga custom chips agnus blitter copper alice aga denise ocs lisa aga paula other amiga custom chips hardware chip ram hold and modify extra half brite kickstart 3rd party hardware flicker fixer action replay amiga sidecar zorro ii zorro iii amiga video connector 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 retrieved from https en wikipedia org w index php title zorro_iii oldid 1289515528 categories amiga computer buses motherboard expansion slot hidden categories articles with short description short description matches wikidata articles lacking reliable references from january 2019 all articles lacking reliable references webarchive template wayback links this page was last edited on 9 may 2025 at 03 42 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 zorro iii 3 languages add topic