Photoshop 1.0 shipped on February 19, 1990 (and Lightroom shipped on the same day of February 2007). If you want to see more on the history of the time line of Photoshop and other great stories from Thomas Knoll and some of the other digital greats that had a hand in on creating some of the world most used and loved software,
take a look here.Wow, I was working for Electro-Ad Sign Systems at the time and was still using press type and a scale ruler. My Wife (engaged at the time) had a Mac SE30. We had Aldus PageMaker 1.0 on it, and Mac Paint and Mac Draw. It wasn't until I had started at Security Mutual when I finally got them to purchase Adobe Photoshop version 2.5. I remember driving to Florida that Christmas and bringing the manual to read down and back. Layers were not part of the program until version 3.0, so creating images in 2.5 was real fun.
I remember going to a Graphic SIG with Eric Hards, and seeing Photoshop 3.0 with layers for the first time. As soon as the people in the room saw how you put things on there own layers, (after the huge gasp) you could of heard a pin drop! Every one had to pick there jaws up off the floor.