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#11
I am not sure if a Sinclair ZX80 would properly be classified as a PC. I bought a kit around about 1981. It ran its own form of DOS and you needed to know a mass of key combinations to get anything on the screen (which was usually your TV)
I moved on to the the Apple 2, which was probably my first authentic PC, but company policy decided we would change to IBM so we, and I, moved into those. First attempt was with DR dos and then PC dos. After that the usual path 286 - 386 - 486 and on.