What do computers have now that they also had in the early 1900s?

What did computers have in the 1930's and 1940's that they still have today?

What do computers have now that they also had in the early 1900s?virus removal

They were called "typewriters" back in the day and the memory was all in the head of the person doing the typing.

What do computers have now that they also had in the early 1900s?anti virus protection

Human operators.
Actually, for the most part they did not have a computer monitor. Usually input was done by hand - later by paper cards - later by paper tape. Output might have been a display of lights in the beginning but usually output went to a line printer, unless they were punching cards as a result. Monitors for the most part came later.

The fundamentals of computing haven't changed, just the hardware. Back then there were logic switches, except they were large. When the transistor was invented, and later the microchip, the switches went from being huge to being microscopic, but they still existed.

For the most part there was off-site storage - usually in the form of paper cards and later, magnetic tape. Now we have hard drives.

There was computer memory, smaller, yes, but it existed.

It's easier to say what there wasn't. There were no graphics cards like you know them, no mice, no mega-giga-bit hard drives.