Amiga Zorro II - Misplaced Pages

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Zorro II is the general purpose expansion bus used by the Amiga 2000 computer. The bus is mainly a buffered extension of the Motorola 68000 bus, with support for bus mastering DMA. The expansion slots use a 100-pin connector and the card form factor is the same as the IBM PC. Zorro II cards implement the Autoconfig protocol for automatic address space assignment (similar to the later PCI technology on the PC).

The prototype "Zorro bus" expansion box for the Amiga 1000 was the basis for the initial Amiga 2000-A model design. This box connected to the Amiga 1000 unbuffered CPU bus card edge connector.

Zorro II was succeeded by Zorro III, a 32-bit, asynchronous bus.

Amiga memory map

Address	Size [MByte]	Description
0x00 0000	2.0	Chip memory
0x20 0000	8.0	Zorro II memory expansion space
0xA0 0000	1.5	Zorro II I/O expansion space
0xB8 0000	3.0	A2000 motherboard register space
0xE8 0000	0.5	Zorro II I/O
0xF0 0000	1.0	Motherboard ROM

External links

Amiga Hardware Database - Descriptions and photos of Zorro II cards.
Discussion about speed of Zorro

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 Chipset (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 Amiga Zorro II Amiga 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 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 IPI SMD 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 I²C (ACCESS.bus, PMBus, SMBus) I3C SPI D²B Parallel SCSI Profibus USB 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 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

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