Amiga Zorro II

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Zorro II is the name of 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 (designed before, yet similar to, Plug and Play on the PC).

The Amiga 1000, A500, and A500+ have a mirror image of a single Zorro slot as their main expansion port – a "male" card edge rather than a "female" card edge socket, with left-handed pin configuration. The prototype expansion box for the A1000 was the basis for the initial Amiga 2000A model design.

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

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