https://rs-485.com/index.php?action=history&feed=atom&title=Zorro_IIZorro II - Revision history2026-05-04T03:02:36ZRevision history for this page on the wikiMediaWiki 1.42.3https://rs-485.com/index.php?title=Zorro_II&diff=1769&oldid=prevRS-485: Imported from Wikipedia (overwrite)2026-05-03T14:45:33Z<p>Imported from Wikipedia (overwrite)</p>
<p><b>New page</b></p><div>{{Short description|Expansion bus used by the Amiga 2000 computer}}<br />
{{Inline citations|date=May 2023}}<br />
[[File:Locale_RS6_Installing the flicker fixer (4817088550) (cropped).jpg|thumb|RAM expansion card for Zorro II Bus (4 MB installed, max 8 MB)]]<br />
[[File:Locale_RS6_Zorro II cards (7802866670).jpg|thumb|Amiga Zorro II cards]]<br />
'''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]] [[direct memory access|DMA]]. The [[expansion slot]]s 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 [[Conventional PCI|PCI]] technology on the PC).<br />
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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]].<br />
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Zorro II was succeeded by [[Amiga Zorro III|Zorro III]], a 32-bit, asynchronous bus.<br />
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== Amiga memory map ==<br />
{| class="wikitable"<br />
|-<br />
! Address || Size &#91;MByte&#93; || Description<br />
|-<br />
|-<br />
|align="right"| 0x00 0000<br />
|align="right"| 2.0 || [[Amiga Chip RAM|Chip memory]]<br />
|-<br />
|align="right"| 0x20 0000<br />
|align="right"| 8.0 || Zorro II memory expansion space<br />
|-<br />
|align="right"| 0xA0 0000<br />
|align="right"| 1.5 || Zorro II I/O expansion space<br />
|-<br />
|align="right"| 0xB8 0000<br />
|align="right"| 3.0 || [[Amiga 2000|A2000]] motherboard register space<br />
|-<br />
|align="right"| 0xE8 0000<br />
|align="right"| 0.5 || Zorro II I/O<br />
|-<br />
|align="right"| 0xF0 0000<br />
|align="right"| 1.0 || Motherboard ROM<br />
|}<br />
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==External links==<br />
{{Portal|Amiga}}<br />
*[http://amiga.resource.cx/exp/search.pl?intf=z2 Amiga Hardware Database] - Descriptions and photos of Zorro II cards.<br />
*[https://forum.amiga.org/index.php?topic=28865 Discussion about speed of Zorro]<br />
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{{Amiga hardware|state=uncollapsed}}<br />
{{Computer-bus}}<br />
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[[Category:Amiga|Zorro II]]<br />
[[Category:Computer buses]]<br />
[[Category:Motherboard expansion slot]]<br />
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{{Compu-hardware-stub}}</div>RS-485