Harvard Mark I and smartphone: what they have in common

1. Step 1. Harvard Mark I — uses — Punched card. The program was read from punched tape and the data from punched cards.
2. Step 2. Punched card — is used in — Mainframe. Programs were entered on punched cards.
3. Step 3. Mainframe — has part — Magnetic-core memory. Magnetic-core memory.
4. Step 4. Magnetic-core memory — evolved into — RAM. DRAM displaced core memory.
5. Step 5. RAM — is part of — Smartphone. RAM.

Open Evothings