PC Card = PCMCIA Card (older name): 16-bit or 32-bit PC Card 32-bit version = Cardbus (alternative name) 16-bit vs. 32-bit: 32 bit includes DMA or bus mastering, 16-bit does not Types I–III: Type I: 16-bit. Configuration thickness 3.3 mm Type II: 16-bit or 32-bit. Configuration thickness 5.0 mm Type III: 16-bit or 32-bit.