Editing Expansion card (section)

==Daughterboard==
[[Image:Roland SCB-55 on Diamond MX300.jpg|thumb|A sound card with a MIDI daughterboard attached]]<!-- This section name is used as for the redirects [[Daughterboard]] and [[Daughter board]] -->[[Image:Inventec daughterboard LSI 1078.jpg|thumb|A daughterboard for [[Inventec]] server platform that acts as a RAID controller based on [[LSI Corporation|LSI]] 1078 chipset]]
A '''daughterboard''', '''daughtercard''', '''mezzanine board''' or '''piggyback board''' is an expansion card that attaches to a system directly.<ref>'' IEEE Std. 100 Authoritative Dictionary of IEEE Standards Terms, Seventh Edition'',  IEEE, 2000,{{ISBN|0-7381-2601-2}},  page 284</ref>  Daughterboards often have plugs, sockets, pins or other attachments for other boards. Daughterboards often have only internal connections within a computer or other electronic devices, and usually access the motherboard directly rather than through a [[computer bus]]. Such boards are used to either improve various memory capacities of a computer, enable the computer to connect to certain kinds of networks that it previously could not connect to, or to allow for users to customize their computers for various purposes such as gaming. <ref>M.J. Memon, What Is A Daughterboard. Easy Tech Junkie. Sep. 24, 2011. https://www.easytechjunkie.com/what-is-a-daughterboard.htm. Accessed Oct. 15, 2021</ref>  

Daughterboards are sometimes used in computers in order to allow for expansion cards to fit parallel to the motherboard, usually to maintain a small [[Computer form factor|form factor]]. This form are also called [[riser card]]s, or risers. Daughterboards are also sometimes used to expand the basic functionality of an electronic device, such as when a certain model has features added to it and is released as a new or separate model. Rather than redesigning the first model completely, a daughterboard may be added to a special connector on the main board. These usually fit on top of and parallel to the board, separated by [[Spacers and standoffs|spacers or standoffs]], and are sometimes called '''mezzanine cards''' due to being stacked like the [[mezzanine]] of a [[theatre]]. [[Table-lookup synthesis|Wavetable]] cards ([[sample-based synthesis]] cards) are often [[wikt:mount|mounted]] on [[sound card]]s in this manner.

[[Image:Raspberry Pi 4B DVB TV μHat (angle).jpg|thumb|right|[[Raspberry Pi]] 4B single-board computer with "TV Hat" card (for DVB-T/T2 television reception) attached]]
Some mezzanine card interface standards include
the 400 pin [[FPGA Mezzanine Card]] (FMC);
the 172 pin High-Speed Mezzanine Card (HSMC);<ref>
Jens Kröger.
[https://www.psi.ch/mu3e/ThesesEN/BachelorKroeger.pdf "Data Transmission at High Rates via Kapton Flexprints for the Mu3e Experiment"].
2014.
p. 43 to 44.
</ref><ref>
Altera.
[https://www.altera.com/content/dam/altera-www/global/en_US/pdfs/literature/ds/hsmc_spec.pdf "High Speed Mezzanine Card (HSMC) Specification"].
p. 2-3.
</ref>
the [[PCI Mezzanine Card]] (PMC);
XMC mezzanines;
the [[Advanced Mezzanine Card]];
IndustryPacks (VITA 4), the [[GreenSpring Computers#Mezzanine modules|GreenSpring Computers Mezzanine modules]];
etc.

Examples of daughterboard-style expansion cards include:
*[[Enhanced Graphics Adapter]] piggyback board, adds memory beyond 64 KB, up to 256 KB<ref>Market Looks to EGA as De Facto Standard, ''InfoWorld'', Aug 19, 1985</ref>
*[[Expanded memory]] piggyback board, adds additional memory to some EMS and EEMS boards<ref>Product Comparison: 16-Bit EMS Memory, ''InfoWorld'', Sep 7, 1987</ref>
*ADD daughterboard
*RAID daughterboard
* [[Network interface controller]] (NIC) daughterboard
*CPU Socket daughterboard
*Bluetooth daughterboard
*Modem daughterboard
*AD/DA/DIO daughter-card
*Communication daughterboard (CDC)
*[[Server Management daughterboard]] (SMDC)
*Serial ATA connector daughterboard
*Robotic daughterboard
*Access control List daughterboard
*[[Arduino#Shields|Arduino "shield"]] daughterboards
*Beaglebone "cape" daughterboard
*Raspberry Pi "HAT add-on board"<ref>{{cite web |title=Add-on boards and HATs |url=https://github.com/raspberrypi/hats |website=GitHub |publisher=Raspberry Pi Foundation |access-date=19 June 2020}}</ref>
*Network Daughterboard (NDB). Commonly integrates: bus interfaces logic, [[Logical link control|LLC]], [[PHY]] and Magnetics onto a single board.