What was the memory capacity of first generation of computer?

Answer 1

1. On word oriented machines it varied from 1000 words to 32000 words (roughly 12000 bytes to 192000 bytes).
2. On character oriented machines it varied from 20000 characters to 80000 characters (roughly 20000 bytes to 80000 bytes).

A few machines were smaller than this, a few were larger. Also if the customer was willing to pay enough, the manufacturer could usually customize things for him.

Answer 2

The first Generation computers did not have memory as we know it today, they had magnetic discs, electrostatic storage tubes, acoustic delay lines (Mercury or nickel), or magnetic core storage.

My first home computer had just 2k of ram.

For more information about first gen comps read the related link below