[duck2]

Computer Science existed long before there were computers. I think the Science of Computers you mention is known as Computer Architecture.

[msla]

> Computer Science existed long before there were computers.

No, various bits and pieces of it did, but not the whole, coherent field, which is motivated by the existence of computers.

[msla]

> Computer Science existed long before there were computers.

Not in its current form, and not if you define "computers" with a sufficiently broad net.

(Or broad loom, tipping a hat to Jacquard... )