lingika ekathu vima sadha kella kamathi karawa ganima

RAM chips are made in a range of different sizes and  the amount  of  memory that can be packed into a single chip is increasing all the time -  usually doubling every few years.  At the time of writing individual chips are available in 256Kbit,  1Mbit and 4Mbit capacities  at a reasonable price. The 64Kbit  chip that used to be  so common has vanished from all new  system and is  considered obsolete by suppliers. This isn’t unreasonable as 64Kbit is a very small  amount of memory  when compared to the Megabytes that are currently in use.

To a very great extent the amount of memory that can be  placed on a single chip has  become less relevant with the introduction of multi-chip modules. Instead of buying a single chip has to plug into a circuit board, it is standard practice to mount several chips together  on a small circuit board of their  own and treat this assembly  as a single  component.  This use of multi-chips modules has reduced the cost of memory per Megabyte by reducing manufacturing costs, but of  course  you have to bye more  at one go! If you are  worried about the increased unreliability to multi-chips modules, after all if one  chip fails you have to replace  the entire  module, it is worth  saying that the  reliability of memory devices  is so high that is  scarcely makes any difference

Currently memory comes packages in three different forms one single chip variety  - DIL (Dual In-line Package, also known as DIP) -  and two types of multi-chips modules – SIMM (Single In-line Memory Module) and SIP (Single In-line Package). The most familiar of these three is  the DIL, which is the  archetypal chip of any  description.