My first was an IBM PC clone. With 40 K of hard ram. 2 - 5 1/4 inch external floppy disk drives - one for the operating system, the other for programs and data. The first time sharing mainframe I worked on was a GE 400 with 28 K core, half of which was reserved for the operating system, the remainder for any programs and swapping data in and out.we transmitted data via punched tape.
I had a TI994A, and we had to hook up a tape recorder to save anything. It worked at least half the time...
I bought a 4kb ram Color Computer for home. I had a TRs 80 at the office
With great trepidation and clucking from my wife, I opened the case and removed the memory and replaced it with 64K!!
It had external hard drive and a small tv for a monitor
it was faster and had better graphics than the much hallybalooed Apple
2 floppy drives - one was the “a:” and the other the (then) soon-to-be-superfluous and now long forgotten “b:” drive. The “c:” drive retained its status as the traditional location for the OS and subsequent other installed/mappable drives now run “d:” though “z:”