PCMCIA was an ISA bus on a card. PC-Card was PCI on a card. Then came Express Card, and no prize for guessing what the bus used there was. Express Card made

PCMCIA was an ISA bus on a card. PC-Card was PCI on a card. Then came Express Card, and no prize for guessing what the bus used there was. Express Card made the mistake of offering multiple form factors which made it harder for laptop manufacturers to support.