ISA Definition - What is an ISA expansion slot? -

So installation of a sound card would be reduced to simply plugging it into that specific slot (So these slots were not intended for memory

The PD slot or PDS is the oldest form of expansion slot Up to three slots can be accommodated, and each slot also accepts an ISA card, but not an MCA or EISA

isa slot pinout Slots are, Display card Network Card Sound Card EISA Slot The Extended Industry Standard Architecture

isa slot adapter ISA slots disappeared from mainstream computer makers systems around 1999 and were replaced by PCI and AGP expansion slots The Intel 845