Listed below is a table summarizing what you have just learned:

Card/Slot Name	Bit Size>	# Of Tabs	PCs Used In	Card Will Fit These Slots	Slot Will Take These Cards
ISA	8-bit	1	8088-386	any ISA/VESA	8-bit only
ISA	16-bit	2	286-Pentium	16-bit ISA/VESA	8/16-bit ISA
EISA	32-bit	2	386-486	EISA only>	all ISA & EISA
VESA	32-bit	4	486	VESA only	all ISA & VESA
PCI	32-bit	2	Pentium	PCI only	PCI only
MCA	16/32-bit	2	IBM's PS/2 386-486	MCA only	MCA only
PCMCIA Type I Type II Type III Type IV	NA	NA	Laptops	Type I, II, III, IV II, III, IV III, IV IV	Type I I, II I, II, III I, II, III, IV

So what type of expansion cards should you buy? The important thing to remember is to match you new card with the type of slot on your motherboard. The type of slots on your motherboard dictate what type of expansion cards you can buy.