RAM --Random Access Memory Time taken to access any arbitrary location in
memory is constant.
ROM --Read Only Memory ROMs are RAMs which can only be written
to once thereafter they can only be read,
older uses included storage of bootstrap info.
PROM --Programmable ROM ROM which can be programmed by a user.
EPROM --Erasable PROM PROM which can be erased for rewriting.
EEPROM --Electrically EPROM PROM which can be erased electrically.
SRAM --Static RAM RAM chip which loses contents upon power off.
DRAM --Dynamic RAM RAM chip whose contents need to be refreshed.
SDRAM --Synchronous DRAM DRAM whose memory operations are
synchronized with a clock signal.