What are these weird long ISA slots on this 386 board?

What are these weird long ISA slots on this 386 board? isa slot full form An ISA slot is “Industry Standard Architecture” which is the same old IBM cloned architecture we've known for years isa expansion slot ISA Founding Conference · India's G20 Presidency Consular Services The application form can be downloaded from the website of the

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isa slot function ISA Founding Conference · India's G20 Presidency Consular Services The application form can be downloaded from the website of the 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