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These are of following three basic types – PROM, EPROM, EEPROM 16ġ7 PROM The Programmable Read Only Memory can be programmed only once in its lifetime. It contains permanently stored instructions that help in staring up of a computer e.g. It retains the information even if power is turned off. Due to leakage of charge requires frequent refreshing and hence extra circuitry. High density, low power consumption, cheap as compared to SRAM. This memory is made up of MOS transistor gates and it stores the bit as charge. 12ġ4 DRAM DRAM stands for Dynamic Random Access Memory. Often known as cache memory in high speed PCs. Each cell requires 6 transistors hence chip has low density but high speed. This memory is made up of flip-flops and stores the bit as a voltage. It is basically of two types: – SRAM – DRAM 11ġ2 SRAM SRAM stands for Static Random Access Memory. It is most common type of memory found in computers, printers etc. any location can be accessed any time within chip. 10ġ1 Basic RAM Cell RAM is a type of computer memory that can be accessed randomly i.e. Arithmetic and logic operations can not be performed on data. IO Mapped IO Special Instructions are used like IN, OUT. Arithmetic and logic operations can be performed on data. 9ġ0 IO mapped IO V/s Memory Mapped IO Memory Mapped IO Memory Instructions are used. 8ĩ IO mapped IO V/s Memory Mapped IO Memory Mapped IO IO is treated as memory. – The user in this case would access these devices using the IN and OUT instructions only. – I/O devices are assigned a “port number” within the 8-bit address range of 00H to FFH. 7Ĩ IO Mapped IO It treats them separately from memory. The user uses the same instructions used for memory. – The exchange of data with these devices follows the transfer of data with memory. – They are assigned a 16-bit address within the address range of the 8085. She is the most successful female rock artist of all time.ħ Memory Mapped IO It considers them like any other memory location. She started her storied career by joining Ike Turner to form The Ike & Tina Turner Revue in 1960. They had a string of hits like 'Fool in Love', 'I Think It's Gonna Work Out Fine', a cover of Creedence Clearwater Revival's 'Proud Mary', and the autobiographical 'Nutbush City Limits' and were widely admired by their audiences and peers.