First computer I used was in a Fortran II class in 1967 or 1968 in college. It took up several large rooms in the basement of the school. First one I bought was an Atari 800, expanded to its maximum of 48k. I even wrote a business program on it in Basic that worked pretty well.
I bought a Mac in about 1986 for my business. A good late friend wrote a program for it to handle invoices, statements etc. It was such a good program that I used it until about 2010 when my last Mac died. I used a PC in the back of the shop to run my laser engraver and for internet access. A friend from England sent me some software to run a Mac simulator that I was able to access my old invoices. We retrieved the data from my old Mac backup hard drive. I couldn't print from the simulator, so I just used it for reference. I found a canned business program online for the PC and customized it to work for invoicing.
My first computerized engraver was a Dahlgren Wizzard XL in the mid 1980s, that cost around $7000. It was such a capable and fast machine that I bought another used one as a backup. Both of those lasted me until 2008, when they were so obsolete that spare parts were unobtainable, so I bought a state of the art Xenetech912 which I still have. The Xenetech was around $8000 without computer, but it made about $200 an hour when it was running.