Library catalogue and personal computer: what they have in common

1. Step 1. Library catalogue — evolved into — Database. Systematizing records.
2. Step 2. Database — evolved from — Hollerith tabulator. Processing large datasets began with tabulators.
3. Step 3. Hollerith tabulator — evolved into — Mainframe. IBM grew out of Hollerith’s company.
4. Step 4. Mainframe — has part — Magnetic-core memory. Magnetic-core memory.
5. Step 5. Magnetic-core memory — evolved into — RAM. DRAM displaced core memory.
6. Step 6. RAM — is part of — Personal computer. RAM.

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