Below is the early history of computers. Since you did not give a specific year, you only need to change the dates earlier by several decades.
Kindly also note that the most notable changes will be transistor technology during world war 1 and WW2. Communications, codes, early robotics, simulations on design will have profound effects on these wars.
The first stationary gasoline engine developed by Carl Benz was a one-cylinder two-stroke unit which ran for the first time on New Year’s Eve 1879.
So if you want transistors before 1879, WW1 and WW2 will be very very different, and this will be just the tip of the iceberg. You would also need to make the electronics era a few decades early.
History of computing
On December 23, William Shockley, Walter Brattain, and John Bardeen successfully tested this point-contact transistor, setting off the semiconductor revolution. Improved models of the transistor, developed at AT&T Bell Laboratories, supplanted vacuum tubes used on computers at the time.
At MIT, Jay Forrester installed magnetic core memory on the Whirlwind computer. Core memory made computers more reliable, faster, and easier to make. Such a system of storage remained popular until the development of semiconductors in the 1970s.
A silicon-based junction transistor, perfected by Gordon Teal of Texas Instruments Inc., brought the price of this component down to $2.50. A Texas Instruments news release from May 10, 1954, read, "Electronic "brains" approaching the human brain in scope and reliability came much closer to reality today with the announcement by Texas Instruments Incorporated of the first commercial production of silicon transistors kernel-sized substitutes for vacuum tubes."
The company became a household name when the first transistor radio incorporated Teal´s invention. The radio, sold by Regency Electronics for $50, launched the world into a global village of instant news and pop music.
Jack Kilby created the first integrated circuit at Texas Instruments to prove that resistors and capacitors could exist on the same piece of semiconductor material. His circuit consisted of a sliver of germanium with five components linked by wires.
Jean Hoerni's Planar process, invented at Fairchild Camera and Instrument Corp., protects transistor junctions with a layer of oxide. This improves reliability and, by allowing printing of conducting channels directly on the silicon surface, enabled Robert Noyce's invention of the monolithic integrated circuit.
Fairchild Camera and Instrument Corp. built the first standard metal oxide semiconductor product for data processing applications, an eight-bit arithmetic unit and accumulator. In a MOS chip, engineers treat the semiconductor material to produce either of two varieties of transistors, called n-type and p-type.
Using integrated circuits, Medtronics constructed the first internal pacemaker.
AT&T designed its Dataphone, the first commercial modem, specifically for converting digital computer data to analog signals for transmission across its long distance network. Outside manufacturers incorporated Bell Laboratories´ digital data sets into commercial products. The development of equalization techniques and bandwidth-conserving modulation systems improved transmission efficiency in national and global systems.
Online transaction processing made its debut in IBM´s SABRE reservation system, set up for American Airlines.
Citizens and Southern National Bank in Valdosta, Ga., installed the country´s first automatic teller machine.
MIT´s Servomechanisms Laboratory demonstrated computer-assisted manufacturing. The school´s Automatically Programmed Tools project created a language, APT, used to instruct milling machine operations. At the demonstration, the machine produced an ashtray for each attendee.
UNIMATE, the first industrial robot, began work at General Motors. Obeying step-by-step commands stored on a magnetic drum, the 4,000-pound arm sequenced and stacked hot pieces of die-cast metal.
A Stanford team led by Ed Feigenbaum created DENDRAL, the first expert system, or program designed to execute the accumulated expertise of specialists. DENDRAL applied a battery of "if-then" rules in chemistry and physics to identify the molecular structure of organic compounds.
So picture a world where you have these innovations available by WW2.