POST card

In computing, a POST card is a diagnostic tool that reports error codes produced by a POST. They are used by technicians to troubleshoot computers that refuse to boot. The cards relay POST codes generated by the system, and the system must therefore have a working CPU and BIOS, in addition to whatever I/O interface the POST card relies on. Thus, POST cards cannot be used to diagnose the cause of e.g. a dead motherboard. POST cards are desirable in situations where video is not available; either because connecting a monitor is impractical, or because the point of failure occurs before the video subsystem can be initialized.

POST cards are inserted into an expansion slot, and are available in ISA, PCI and other variants.The card reports a number, consisting of two hexadecimal digits, that is output to an I/O port by the BIOS while running the POST.Reference tables covering different BIOSes are needed.

Some motherboards come with a built-in display to diagnose hardware problems. Most also report POST errors with audible beeps, if a PC speaker is attached.


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • post|card — post card, or post|card «POHST KAHRD», noun. 1. a card without postage printed on it, usually with a picture on one side, used to send a message through the mail. It is made by a private company. 2. a similar card with a printed postage stamp,… …   Useful english dictionary

  • post card — noun a card for sending messages by post without an envelope • Syn: ↑postcard, ↑postal card, ↑mailing card • Hypernyms: ↑card • Hyponyms: ↑lettercard, ↑picture postcard …   Useful english dictionary

  • Post card — Postal Post al, a. [Cf. F. postal.] Belonging to the post office or mail service; as, postal arrangements; postal authorities. [1913 Webster] {Postal card}, or {Post card}, a card used for transmission of messages through the mails, at a lower… …   The Collaborative International Dictionary of English

  • POST Card — Вариант платы для 8 битной ISA шины …   Википедия

  • post card — A card for mailing, privately produced and sold, usually containing a picture or words of greeting or congratulation on one side. Sent as first class mail. See postal card …   Ballentine's law dictionary

  • post·card — /ˈpoʊstˌkɑɚd/ noun, pl cards [count] : a card on which a message may be sent by mail without an envelope and that often has a picture on one side see also ↑picture postcard …   Useful english dictionary

  • POST card — …   Википедия

  • post card — see postcard …   English dictionary

  • post´al|ly — post|al «POHS tuhl», adjective, noun. –adj. having to do with mail and post offices: »postal regulations, a postal clerk. –n. U.S. a post card. –post´al|ly, adverb …   Useful english dictionary

  • post|al — «POHS tuhl», adjective, noun. –adj. having to do with mail and post offices: »postal regulations, a postal clerk. –n. U.S. a post card. –post´al|ly, adverb …   Useful english dictionary


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.