Nowadays, there are two different types of letters that we know of today:
One of them is Captial letters which came from carved letters of the Romans.
The other are the small case letters which came from the Book of Kells.
Most books back then have to use the printing press to produce copies.
Until the Industrial Revolution, which began in the 19th century, where metallic casings and typewriters was invented and the consumer ease that soon followed.
Then the personal computers (PC) soon followed in the 80’s.
Now we have the computers that we know of today.