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).