README file for prime_demo
Friday, March 06, 2015
Author Ken Shirriff

prime_demo is a demonstration program run on the IBM 1401
It uses the sieve of Eratosthenes an ancient algorithm for finding all prime numbers up to any given limit. 

For this program, the given limit is 25,000 due to the memory limitation of the computer.

The program will terminate with a halt.
If you want to run it again with a new set of cards, set sense switch G on, clear the card reader, place the second date, name and EOF cards in the reader and press start.

If you don’t want to run it again, leave sense switch  G off and when you press start, it will look for and read in the next program.