page_title: Riser card
hierarchical_section_title: Riser card
caption_attribution_description: English: Internal design of the IBM PS/2 Model 55 SX, showing the Micro-Channel Architecture slot riser card. The edge connector across the top supplied power and data to the single internal hard drive that a PS/2 could accept. It is interesting to note that the hard drive appears to connect straight to the MCA bus without any interceding drive controller electronics. IBM called this Direct Bus Attachment (DBA), and most common was DBA ESDI that emulated a PS/2 ESDI controller.
context_page_description: A riser card is a printed circuit board that picks up a multitude of signal lines via a single connector on a motherboard and distributes them via dedicated connectors on the card.
  Riser cards are often used to allow adding expansion cards to a system enclosed in a low-profile case where the height of the case does not allow for a perpendicular placement of the full-height expansion card.
  A riser card is a board that plugs into the system board and provides additional slots for adapter cards.
  Because it rises above the system board, it enables you to connect additional adapters to
  the system in an orientation that is parallel to the system board and save space within the system case.
context_section_description: A riser card is a printed circuit board that picks up a multitude of signal lines (often bused) via a single connector (usually an edge connector) on a motherboard and distributes them via dedicated connectors on the card.
  Riser cards are often used to allow adding expansion cards to a system enclosed in a low-profile case where the height of the case does not allow for a perpendicular placement of the full-height expansion card.
  A riser card is a board that plugs into the system board and provides additional slots for adapter cards. 
  Because it rises above the system board, it enables you to connect additional adapters to 
  the system in an orientation  that is parallel to the system board and save space within the system case.
caption: A riser card inside an IBM PS/2
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