| Year | Name of Computer | Functions | CPU | RAM/storage | Display/Output | OS |
| 1950 | Simon
 | Intended for the educational purpose of demonstrating the concept of digital computer | 2 bits arithmetic logic unit (ALU) | 12bits | 5 lams | |
| 1957 | IBM 610
 | It was designed to be used in a normal office. | vacuum tube logic circuitry | Punched paper tape | IBM electric typewriter, | |
| 1957 | Olivetti Elea 9003
 | first solid-state computer-being able to manage three programs at the same time | | 7 bits | | |
| 1965 | Olivetti Programma 101
 | a printing programmable calculator or desktop calculator.This is the first personal computer in the world sold as a functioning pre-assembled system with a built-in floppy disk reader. | ould execute 8000-10000 instructions per second | 240 bytes | Self printed | |
| 1968 | Hewlett-Packard 9100A
 | The 9100A was the first scientific calculator or Personal computer of that time in modern definitions such as triangular , logarithmic , and exponential functions . The HP 9100 is a personal computer .The machine incorporates several technologies from Olivetti Programma 101 , including magnetic cards and architecture. | | | Built-in display Three-line CRT | |
| 1970 | Datapoint 2200
 | Resemblance to the modern personal computer, with a CRT screen, keyboard, programmability, and program storage | discrete logic implementation of the Intel 8008 instruction set | 2 KB standard; expandable to 16 KB | Text only Display, 80×12 characters | |
| 1971 | Kenbak-1
 | Kenbak-1 worked had no monitor, no keyboard, no mouse or disk drive but its low price was affordable. | | 8-bit machine offered 256 bytes of memory | | |
| | | | | | |
| | | | | | |
| | | | | | |
| | | | | | |
| | | | | | |
| | | | | | |
| | | | | | |
| | | | | | |
| | | | | | |
| | | | | | |
| | | | | | |
| | | | | | |
| | | | | | |
| | | | | | |
| | | | | | |
| | | | | | |
| | | | | | |
| | | | | | |
