Maestro issuing banks include the State Bank of India (India's largest bank), State Bank's affiliate banks, Punjab National Bank, Syndicate Bank, Oriental Bank of Commerce, Bank of Rajasthan, etc.
Maestro is a payment system that has been offered by the payment provider Mastercard since 1991. A girocard or debit card that has the Maestro co-badge can be used at millions of places worldwide.
Remember that emulators are only part of what you need to play games on your computer. You need to download a ROM for that video game console you wish to emulate. A ROM acts as the video game cartridge for the emulator, which acts as the console. The Internet is your best friend when searching for the ROMs.