Ink & Epoch
Computing · 1945 · No. 13

The Room-Sized Brain

You are hired to operate ENIAC, a computer that fills a room and is programmed by moving cables and flipping switches. Write your first week learning to speak to a machine that thinks in numbers.

ENIAC, unveiled in 1946, was among the first general-purpose electronic computers. It filled a large room, used thousands of vacuum tubes, and was largely programmed by a team of women mathematicians.

Field notes

Did you know

  • ENIAC's original programmers were six women, long uncredited.
  • It used around 18,000 vacuum tubes, which failed often.
  • 'Programming' meant physically rewiring the machine for each new problem.

Key phrases

vacuum tube · patch cable · the panel · a mind made of switches · the hum of the room

Chase this down

Look up: the ENIAC programmers (Jean Bartik and colleagues).

Craft tip

Unfamiliar technology is best explained through a beginner's confusion, not an expert's summary.

Try this

Write it as a training memo from one operator to the next.

Ready 0 words