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Posted: **Fri Apr 29, 2022 8:55 am**

: 4 A Keyboard Is Connected With The 8086 Microprocessor System Using The 8255 Programmable Peripheral Interfacing Ic Th 1 (31.64 KiB) Viewed 42 times

: 4 A Keyboard Is Connected With The 8086 Microprocessor System Using The 8255 Programmable Peripheral Interfacing Ic Th 2 (47.56 KiB) Viewed 42 times

: 4 A Keyboard Is Connected With The 8086 Microprocessor System Using The 8255 Programmable Peripheral Interfacing Ic Th 3 (47.56 KiB) Viewed 42 times

4. A keyboard is connected with the 8086-microprocessor system using the 8255-programmable peripheral interfacing IC. The rows of the keyboard are connected to Port-B as shown in figure 2. Columns are connected to Port-C. (a) Find the addresses of the ports and control register, (b) Find the control word, (c) Write an assembly language program to read the key pressed on keyboard
5V Voc R RS РВО TORD R BA wo RD PB, o iz 4 5 6 TOWR WR PB. R: 00 8 9 BA PB, X6 + CLR Do-D 8255 PPI Αο A: Az A: PC PC: G PC) CS PC) Do As A >JA >B As > Aus As 3 to 8 Decoder G G2A Db >4628 Ao Fig.2: Keyboard interfaced with 8255