My first home PC was a Texas Instruments TI-99/4A. According to Wikipedia, it had a 3 Mhz CPU made by Texas Instruments, 16 kilobytes of graphics RAM and 256 bytes of "scratchpad" RAM. Programs that I typed in were saved to audio cassettes. It had a BASIC language interpreter built-in and from that I taught myself programming. I took a class on BASIC to expand on that and from that ended up quitting my career in sales, going back to school to learn programming, becoming a college instructor and then a software engineer. That first computer put me on the road to the career from which I just retired.
My second home computer was a LOT more fun. It was a Commodore C64. It had a 1 Mhz CPU made by MOS, 64 kilobytes of RAM and 20 kilobytes of ROM. I had first one then two floppy drives (5.25", 160 Kb single-sided diskettes). It also had a BASIC language interpreter built-in but you could load and run interpreters and compilers for several other programming languages plus word processors, spreadsheet generators, graphics programs, music programs and thousands of games. There are still people out there that think that this was the most fun home computer ever.
I eventually got an IBM PS/2 PC; the first "serious" or "business" computer I ever owned. It was the first I had that included a hard drive (aka a "fixed disc"). Since then I've bought or built probably a dozen or more computers for myself and dozens for other folks.
There is no other technology that has ever grown the way electronics like this has. For example, my first hard drive held forty megabytes (essentially, forty million bytes). I have several hard drives in my current PC ranging from two to eight trillion bytes each and each of them are smaller, hugely faster and much less expensive than that first one. Plus I have a tiny "flash" drive in my phone that holds 128 billion bytes (32,000 times the capacity of my first drive), has no moving parts and is the size of the fingernail on my little finger. The advances are mind-boggling. Don't even get me started on comparing tablets and smart phones to those original PCs. If cars had advanced at the rate of computers, we'd all be buying flying cars for a few hundred dollars that got a thousand miles a gallon and could go into orbit or drive us to the moon.
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