Memories in the ROM family are distinguished by the methods used to write data on them and the number
of times they can be rewritten. This classification reflects the evolution of ROM devices from ‘hard-wired’
to programmable to erasable-and-programmable. One common feature of all these devices is their ability to
retain data and programs even during a power failure. ROMs come in following varieties:
Masked ROM•: The very first ROMs, known as masked ROMs, were hard-wired devices that contained a
pre-programmed set of data or instructions. The contents of such ROMs had to be specified before ...
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