..and/ or Analytical Engine?
Aside from this being properly in the pre-1900's area:
1) The tables Babbage wanted the machines to calculate get done better.
2) Someone eventually realises that if the internal calculations are done in Binary instead of Decimal numbering the Engine can be made dramatically simpler and more reliable.
3) The smaller more reliable Engine develops all sorts of business uses. Still a big expensive machine but it is now in the mainframe category rather than the "the computer WAS a three story building and you needed to book six months ahead to use it" era.
At this point the butterflies start to grow to the size of eagles and the changes become hard to follow. Having this kind of power available will not result in business as usual. Science will have advanced faster than OTL as well as unpredictable changes in social structures, more accurate artillery tables might or might not make a difference to WWI, better calculations might make manufacturing better/cheaper/higher quality...
4) At some point electronics take over for the internal mechanism.