tall card n.
A PC/AT-size expansion card (these can be larger than IBM PC
or XT cards because the AT case is bigger). See also short card. 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.