Mini PCI was added to PCI version 2.2 for use in laptops; it uses a 32-bit, 33 MHz bus with powered connections (3.3 V only; 5 V is limited to 100 mA) and support for bus mastering and DMA.
 The standard size for Mini PCI cards is approximately a quarter of their full-sized counterparts.
There is no access to the card from outside the case, unlike desktop PCI cards with brackets carrying connectors.
 This limits the kinds of functions a Mini PCI card can perform.

Many Mini PCI devices were developed such as Wi-Fi, Fast Ethernet, Bluetooth, modems (often Winmodems), sound cards, cryptographic accelerators, SCSI, IDE–ATA, SATA controllers and combination cards.
Mini PCI cards can be used with regular PCI-equipped hardware, using Mini PCI-to-PCI converters.
Mini PCI has been superseded by the much narrower PCI Express Mini Card
Mini PCI was added to PCI version 2.2 for use in laptops; it uses a 32-bit, 33 MHz bus with powered connections (3.3 V only; 5 V is limited to 100 mA) and support for bus mastering and DMA.  The standard size for Mini PCI cards is approximately a quarter of their full-sized counterparts. There is no access to the card from outside the case, unlike desktop PCI cards with brackets carrying connectors.  This limits the kinds of functions a Mini PCI card can perform.
Many Mini PCI devices were developed such as Wi-Fi, Fast Ethernet, Bluetooth, modems (often Winmodems), sound cards, cryptographic accelerators, SCSI, IDE–ATA, SATA controllers and combination cards. Mini PCI cards can be used with regular PCI-equipped hardware, using Mini PCI-to-PCI converters. Mini PCI has been superseded by the much narrower PCI Express Mini Card
Peripheral Component Interconnect