I began with the PDP 11 where I learned FORTRAN and Assembler. Seems they ran the whole university on that 16K (?) machine.
In graduate school I knew a fellow who ran one factor analysis (with several rotations) on a Friden (like Bob Jewett showed). Took him a year to do it and he earned a PhD for his efforts. By the time I came along we ran several types of factor analysis with different rotations in a few minutes of IBM 360 cpu time. Course you had to wire the card sorter and sort the deck prior to running an analysis.
Later I had the 14th TRS 80 "model I" that was built. Actually my brother gave it to me and I upgraded it with a $10,000 bank loan. Seems the machine cost about $500.0. I went nuts with the Psych diagnostic possibilities of a PC. I remember telling people at the time that the PC was the wave of the future. At one time I owned every TRS 80 built as well as Apple and IBM machines.
In the late 70s I wrote a three window display updating each window as the user input data for my diagnostic software (using the environment variable) and that was before there was windows. Course I was also a criminal profiler before there were profilers, let alone TV shows.
With that first TRS 80 we quickly learned that you could clip the floppy and double the storage capacity. I think I had four drives and about 160k on line in a 48k machine. It was maxed out for CPU and it had a green screen (remember them). Course you had to flip the floppy to get the extra storage. Really trucking now.
As I remember it cost me nearly $300.00 for a descender chip on my huge Centronics printer. For the new kids that allowed you to place the tail of the g below the line and other fancy stuff.
When people started networking I refused to learn it. Defeated the reason for having a PC. As can be imagined, I get left in the dust.
So much for old guys but we did have fun out on the bleeding edge of technology at the time.
Heck even the spell checker today doesn't know what a descender or a Centronics is.
Sorry for getting off topic, even us old guys have to reminisce now and again.