Conway's Life for EDSAC, 2021.
Reading the initial pattern from a file.

1. File format
--------------
The file should contain 16 lines, each with 35 characters, forming the pattern that will be seen on the EDSAC display. Live and dead cells are represented by any characters whose EDSAC code ends with 1 and 0 respectively, for example:

Live                Dead
* (asterisk)        - (hyphen)
1 (one)             0 (zero)
O (letter oh)       . (full stop)

See the Tutorial Guide (near the end) for a list of EDSAC character sodes.

The program ignores any extra characters, so notes or a caption can be added after the pattern, thus:

...................................
..................OO...............
..................O.O..............
.............O....O.OO.............
............OO.....O...............
...........O..O....................
...........OOO.....................
...................................
.....................OOO...........
....................O..O...........
...............O.....OO............
.............OO.O....O.............
..............O.O..................
...............OO..................
...................................
...................................
Achim's period 16, from Life Lexicon

2. Reading the input file
-------------------------
When option 0 is chosen on the phone dial, EdsacPC will display a message "End of input tape encountered".

- Close the message by clicking the OK button.
- Open the file containing the desired pattern.
- Make sure the window with the desired pattern is on top.
- Click Reset on the EdsacPC panel.
