<hardware> An expansion card for the IBM PC AT. These can be larger than IBM PC or IBM PC XT cards because the AT case is bigger.
When IBM introduced the PS/2 model 30 (its last gasp at supporting the ISA) they made the case lower and many industry-standard tall cards wouldn't fit. This was felt to be a reincarnation of the connector conspiracy, done with less style.
See also short card.
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Nearby terms: talker system « talk mode « TALL « tall card » Tandem Application Language » Tandem Computers » Tandy