Lecture 14: Input/Output Configuration

#ProgramControlledDataTransfer #InputOutputDataTransfer
INPUT-OUTPUT CONFIGURATION:
The terminal sends and receives serial information. Each quantity of information has eight bits of an alphanumeric code. The serial information from the keyboard is shifted into the input register INPR. The serial information for the printer is stored in the output register OUTR. These two registers communicate with a communication interface serially and with the AC in parallel. The transmitter interface receives serial information from the keyboard and transmits it to INPR. The receiver interface receives information from OUTR and sends it to the printer serially.
The input register INPR consists of eight bits and holds an alphanumeric input information. The 1-bit input flag FGI is a control flip-flop. The flag bit is set to 1 when new Information is available in the input device and is cleared to 0 when the information is accepted by the computer. The flag is needed to synchronize the timing rate difference between the input device and the computer. The process of information transfer is as follows. Initially, the input flag FGI is cleared to 0. When a key is struck in the keyboard, an 8-bit alphanumeric code is shifted into INPR and the input flag FGI is set to 1. As long as the flag is set, the information in INPR cannot be changed by striking another key. The computer checks the flag bit; if it is 1, the information from INPR is transferred in parallel into AC and FGI is cleared to 0. Once the flag is
cleared, new information can be shifted into INPR by striking another key.

[gamingmachine]

sarai ramailo ra sajilo vaira cha sir ajhai dherai video banaunu hola

[arjunsherpa]

Bro! you are simply doing great work..
Thanks for your hard work..
Go Blesh you..

[milanbista]

please
upload nxt lecture videos of this subject