Dawn of the Personal Computer: From Altair to the IBM PC
Epson HX-20
Epson’s HX-20 was the world’s first effective and popular notebook computer. It could run for 50 hours on its internal battery, had a real keyboard, built-in productivity applications, and mass storage. It even had a built-in printer!
Sure, the 4x20 character LCD was a bit limiting and the tape drive was slow, but this was a real computer in a sub-4lb package that worked!
The ability to add ROMs for additional functionality made this machine popular for targeted applications like engineering and data gathering.
The system also presaged the laptop form-factor, minus the clamshell screen.
RAM 16K
CPU .6MHz Hitachi 6301
Supporting OS CP/M
Predecessor None
Successor Later notebook formfactor computers
Notable Firsts First notebook computer
IBM PC
The IBM PC was one of the most anticipated arrivals to the personal computer era. IBM countered its usual process to produce the PC quickly using mostly off-the-shelf parts.
Almost all modern PCs, even those running Mac OS and UNIX flavors, are descendants of this venerable architecture.
Although IBM entering the Personal Computer market had a profound effect on how computers were accepted in business, the biggest impact was Microsoft licensing DOS and BASIC to IBM. Bill Gates was able to wrangle an open agreement that allowed Microsoft to eventually sell these products to other vendors.
As soon as the clones started coming Microsoft had a ready market that just kept growing.
RAM 16K-640K
CPU 4.77MHz 8088
Supporting Operating Systems PC DOS, CP/M, UCSD-P
Predecessor IBM 5100 and various early PCs
Successor IBM PC XT and the rest of the line
Notable firsts First successful IBM Personal Computer
Commodore 64

The Commodore 64 is one of the most recognized computers ever built. It should be; it holds the world record for the most units sold of any computer. What the C64 lacked in technology it made up for in popularity and price.
This machine helped cement the idea of a “home” computer when that concept was almost as alien as a personal aircraft carrier and it did so because the machine was both affordable and accessible.
While a few Commodores were used for productivity most ended up as game systems while an entire generation of software engineers got their programming start writing BASIC code on a C64.
RAM 64K
CPU 1MHz MOS 6510
Supporting OS Built-in BASIC and CP/M (with additional hardware)
Predecessor Commodore PET line
Successor Commodore Plus/4, Amiga, and later machines
Notable Firsts Best-selling PC ever
Franklin Ace 100
The nascent personal computer industry had never addressed copyright issues for hardware and firmware designs until Franklin copied the Apple ][ (down to the ROMs) and started selling them at a discount.
Apple quickly sued and, in 1983, won a judgment against Franklin in a landmark court case. Franklin was then forced to reengineer their products and to reverse engineer Apple’s ROMs, but by the time they came out with their new machines it was already near end of life for the Apple ][ line, the PC was king and the Mac was out of the gate.
RAM 16K-48K
CPU 1MHz 6502
Supporting OS Apple DOS
Predecessor Apple ][
Successor Ace 1000, Ace 1200
Notable Firsts Caused the first software copyright lawsuit