CardBus

CardBus was a 32-bit peripheral interface standard specified by PCMCIA 5.0 or later ( 4.2 or later) from February 1995 onward.PC Card Primer, The Official PCMCIA Association website. Archived 2010-02-04.
==Description==
CardBus is effectively a 32-bit, 33 MHz PCI bus in the form factor of a PC Card, which it superseded. CardBus supports , which allows a controller on the bus to talk to other devices or memory without going through the CPU. Many chipsets, such as those that support Wi-Fi, are available for both PCI and CardBus.
The notch on the left hand front of the device is slightly shallower on a CardBus device so, by design, a 32-bit device cannot be plugged into earlier equipment supporting only 16-bit devices. Most new slots accept both CardBus and the original 16-bit PC Card devices. CardBus cards can be distinguished from older cards by the presence of a gold band with eight small studs on the top of the card next to the pin sockets.
The speed of CardBus interfaces in 32-bit depends on the transfer type: in byte mode, transfer is 33 MB/s; in word mode it is 66 MB/s; and in dword (doubleword) mode 132 MB/s.
==Apple models with CardBus support==
*Wallstreet PowerBook G3, May 1998 (two Type II or one Type III)
*Wallstreet II/PDQ PowerBook G3, September 1998 (two Type II or one Type III)
*Lombard PowerBook G3, May 1999
*Pismo PowerBook G3, February 2000
*Titanium PowerBook G4, January 2001
*17" Aluminum PowerBook G4, January 2003
*15" Aluminum PowerBook G4, September 2003PowerBooks with CardBus Support by Daniel Knight, Low End Mac. 2018-04-03.
==Discontinuation==
PCMCIA 8.0 specified the newer CardBay standard, which was based on the Universal Serial Bus to allow of peripheral devices.PCMCIA release CardBay spec, Digital Photography Review. 2001-03-27. However, Apple never used CardBay as it had already adopted USB. CardBus was replaced with the incompatible ExpressCard and SD card form factors in the MacBook Pro line.
==References==
==External links==
*PCMCIA The Worldwide Organization for Modular Peripherals (archived 1998-12-02)
**CardBus Information (archived 1999-08-27)
* at Wikipedia
Category:Components