ATMs originally used operating systems like MS-DOS and PC-DOS, but have increasingly adopted Linux and Unix. When a customer initiates a transaction at an ATM, the details are sent to the host processor which checks the information with the authorized bank and, if correct, transfers funds electronically from the customer's bank account to the ATM machine to dispense cash. Proper use of ATMs can provide convenience, but theft and misuse of cards must be prevented.

4.  A Wincor Nixdorf ATM running with Windows
2000
 Platforms used in ATM include MS-DOS,PC-
DOS etc..
 Java,Linux,Unix can also be used
 Through Linux finding some reception,MS-DOS
was replaced by Linux
 CAL protocols such as Diebold 911 or 912 are
replace by new protocols as IFX
 Financial institutions are interested in using CEN
FXS or FXS which provide common API

5. ATM Networking
 When a transaction is made, the details are inputted
by the card holder. This information is passed on to the host
processor by the ATM machine.
 The host processor checks these details with the
authorized bank.

 If the details are correct, the requested cash by the
card holder is taken with the help of an electronic fund from
the customer’s bank account to the host processor’s account.
 After this function is carried out, the processor sends
an approval code to the ATM machine so that the cash can be
transferred.

30.  Usage of ATM cards is time consuming
 Proper use of ATMs in a right way leads to good
result but improper uses like thefting and misuse of
cards must be stopped
 So use your transactions in a good way

33.  http://www.circuitstoday.com/working-of-
automatic-teller-machine-atm
 http://en.wikipedia.org/wiki/Automated_tel
ler_machine
 http://www.slideshare.net/tejinderubs/auto
mated-teller-machines