SCO Ed6 Page9 - Phase1 0009/2384

[sorcerer_see]

P.S. I synthesize and re-write in my own words what books teach, write any example programs they contain, solve all exercises they offer, and comment cursively. I list pages done vs total pages, including any roman and appendix numbering.

SCO Ed6 Page9 - Phase1 0009/2384

The invention of Microprogramming

In the 1940's, computers had only two levels:

• the digital logic level (Level 0)

here programs were executed

• the ISA level (Level 1)

here the programming was done 

 

Hardware then was complicated, difficult to understand and built, and unreliable.