The good 'ol days of DOS. Brings a tear to my eye.
I remember learning DOS on the 8086 platform, My Tandy 1000!
I think the proc speed was around 4MHZ, with 640KB of RAM, a 5 1/4" floppy and the latest 3.5" floppy that could hold an incredible 720K or data. Who could possibly need more than 720KB of storage?
And don't get me started on GW-Basic.