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Class of Microcomputers II at a University needs to design a computer system with an 8-bit address bus, an 8-bit data bus and it uses isolated I/O. It has:
(1) 128 bytes of EPROM starting at address OOH (11 meaning in hexadecimal) constructed using 64x4 chips;(2) 64 bytes of RAM constructed using 16x8 chips;(3) an input device with a READY signal at address ABH;(4) an output device with a READY signal at address CDH;(5) a bidirectional input/output device with no READY signal at address EFH.
Please show the complete design for this system. (Choose an appropriate starting address for the RAM by yourself, and use a decoder to enable memory chips.) Include all enable and load logic.
Note: Points will be given by evaluating the following components:
(1) Memory chips and structure (25%);(2) Memory chips decoder (25%);(3) Input & output devices and their enable logic (25%);(4) Data bus and other wire connections (25% in which 5% is for the width of the connection wire betweerf all pairs of components).
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