Touchpad and jacquard loom: what they have in common

1. Step 1. Touchpad — is part of — Laptop. A touchpad.
2. Step 2. Laptop — has part — RAM. RAM holds the open programs while the laptop is on.
3. Step 3. RAM — evolved from — Magnetic-core memory. DRAM displaced core memory.
4. Step 4. Magnetic-core memory — is part of — Mainframe. Magnetic-core memory.
5. Step 5. Mainframe — uses — Punched card. Programs were entered on punched cards.
6. Step 6. Punched card — is used in — Jacquard loom. Each punched card sets one pass of the pattern.

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