The TRS-80 Model I with 4 KB and a cassette deck was my first computer. I will always have a love for it. I don't have a real one anymore, but I do maintain this emulator page. A lot of the code was written by Peter Phillips and I thank him so much for it. I attached the virtual keyboard, all the programs, and the ability to store programs.
TRS-80 Emulator with Programs
Here's a Model III emulator I don't maintain. I like its support for lower/upper case and the inclusion of some programs I haven't been able to get working on my site yet.JTandy RetroLandia.net
My second computer was a Tandy Color Computer 3. I wrote my first chess program on it in BASIC and used every bit of memory. I had a lot of fun on the thing and wrote several papers on it during college and printed on a Tandy DMP-105 dot matrix printer.JS Mocha - The HTML5 CoCo 2 Emulator
On a lark I bought a Timex Sinclair since they were so cheap. I bought a 64k expansion for it and fought through the weird keyboard and random resets because of the expansion connector. It's fun trying to do something on this emulator because the Timex worked so differently from what I was used to.
JtyOne Online ZX81 Emulator
My last non-PC purchase in college which I used for the vast amount of paper writing and dial-up to the schools mainframes (at 300 baud) was a Tandy Model 100.
The IBM-PC was a very important platform for me. I used it for many years before Windows existed.