I started on SuperCalc(v1 if I recall never really had a version #) on a Tandy 2000, one of the (maybe the only) "Made it to Market" 80186 computers. DOS...hmmm v?? dunno was late '87 though, prolly 2.?. Was the first Computer I had, that had a real (16) COLOR DISPLAY!!!!
This one was really great... it had XENIX on the 10MB hard drive and I used floppies to boot into DOS and ran SC from a 360K disk... a second one for the print engine... Never really used the XENIX... didn't like it at the time... ended up using debug 0800:70 (I believe) to start the low-level format from the controller, and installed DOS on the HD. (BONKS SELF in HEAD) didn;t know what I had.
The stuff I used to do with that... WOW... sales report graphs for a few local companies... all being plotted out on a time-shared E size 16 pen 102"/sec plotter I had access to... Man brings back some memories.
Shoot can't remember the CAD package I had then too... it ran on 4 - 360K floppies...
Then I DISCOVERED BBSing... and it has been ALL down hill from there.
The one thing I remember about that T2000... I needed a forklift to move it anywhere...