What are the advantages of ISA slots over PCI slots?

I wanted to connect an 8 bit ISA slot, only to access the IO adresse range, to my Vic 20 The main reason being to connect a network card and put the Vic

ISA Slots This diagram shows a motherboard with three 16-bit ISA slots Earlier Expansion Cards Except for the PCI bus, ISA, AGP, EISA, Micro

isa slot uses The ISA bus provided direct memory access using multiple expansion cards on a memory channel allowing separate interrupt request transactions for each card

isa slot computer The EISA bus slot is a two-level staggered pin system, with the upper part of the slot corresponding to the standard ISA bus pin layout