Memory is a component that is used to store binary instructions to be executed by the microprocessor, as well as the data used to work. The memory can be directly accessed by the microprocessor, namely RAM (random access memory) that can be read-write and ROM (read only memory) that can only be read only. RAM is a chip out of mikroprosesar in the form of temporary memory and has a certain capacity. RAM for microcomputer applications separti in figure 2.4 and table functions as in Table II-1.
Figure 5 Block diagram of RAM
Table 1 Table function
ROM is a data repository that functions as the operating system to work to instruct the microprocessor where the data pemnyimpanan ROM is permanent and has a certain capacity, a block diagram for the ROM as in figure 2.5.
Figure 6 Block diagram ROM
Input / output ports
Port input / output is the component that connects the microprocessor to the external device (printer hard disk, keyboard, monitor, etc.). So port applies here as “the door” to outside devices. As a memory, I / O port is also not a single component (meaning there are many ports in the computer system) are each assigned a specific address. Thus the microprocessor know, for example, where to send the data to the printer, retrieve the data from the mouse and so on.