My first computer was an IBM 1620:

After that (not counting the programmer/test station for the Pershing missile I helped run in the army) it was a TRS-80 Model I, with a cassette drive and 16K of RAM. A few years later I started a home computer software store, so I acquired one of each common home computer of the era: a TI-99/4a, a Timex Sinclair, a VIC-20, a Commodore 64, a Radio Shack Color Computer, and an Atari 400. I got the Atari 400 because it was functionally similar to the Atari 800 and allowed me to demonstrate all the software, but was cheaper. I modded the 400 and Radio Shack CoCo to have actual keyboards rather than the membrane and chiclet (respectively) ones they came with. I used these machines with used TVs I acquired as demo units for all the software I had for sale. The business lasted until K-Mart (among others) realized that there was a market for 3rd-party software for these machines, at which point they undersold my small business on the popular titles, relegating me to the harder-to-find (and therefore less in-demand) programs. Realizing the business was going away, I closed it gracefully and moved on to work in a ComputerLand retail store. This was around 1985 or so, I think.