Analysis of information sources in references of the Wikipedia article "திரைப்புலச் சூழல்" in Tamil language version.
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The main goals in the design of the Alto's user input/output were generality of the facilities and simplicity of the hardware. We also attached a high value to modeling the capabilities of existing manual media; after all, these have evolved over many hundreds of years. There are good reasons for most of their characteristics, and much has been learned about how to use them effectively. The manual media we chose as models were paper and ink (the display), pointing devices (the mouse and cursor), and keyboard devices ranging from typewriters to pianos and organs.
