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SIMMs and SIPs are easier  to use than  DIL chips because they are actually small printed circuit boards with enough memory chips mounted to make byte-wide memory. For  example, a 1MBitx9 SIMM or SIP  will contain enough  chips to  provide  a full 1 MByte of parity checked memory.

The advantage of SIMM or SIP memory is that it occupies less space and is easier to install than the large number of DIL  chips that it replaces. The only disadvantage are that SIMM and SIP  memory  is marginally more expensive  than the equivalent number of chips and one faulty  chip on a SIMM or SIP means replacing   the entire module rather then just the  chip. In practices,  memory is reliable enough for this not to be a serious concern and overall  they are a chapter way of reaching  larger memory capacities. Machine that use DIL chips usually have to resort to expensive memory expansion boards to reach the same memory capacities.                                                                    

SIMM are inserted into small printed circuit sockets and it is usual for a number of such sockets to be grouped together is form a memory expansive area. There are two types of  SIMM sockets – push-in and rotate. Using the order push-in sockets it can take considerable force to fit insert a SIMM. The more modern SIMM socket allows  a SIM to be fitted almost without any post being applied. You place the SIMM in the socket at about  degrees and then push it back into place.  A clip at either end of the socket  then holds it in place. The clip has to be released before the SIMM can be removed. SIMMs have to be  inserted the correct way  round but that’s the only possibility of ;

SIPs are slightly more difficult to insert as  you have to make sure that all of the pins are correctly aligned the pins, a steady even pressure should cause the SIP to slid slowly into place. It is important to insert the SIP the correct way round. Most SIPs and SIP sockets are marked with a dot at one end which should with lined up but you check your machine’s manual. There are also two different types of SIP packages with  30 or 32 pins.

Of course,  you can only use the type of memory packages that your machine  can accept.,  but some machines are versatile enough to take a mixture of DIL and SIP/SIMM memory. If you do have a choice then you should  always choose the mixture that gives you the maximum potential RAM without having to remove  any memory  that is already fitted. Many machines have to be informed of exactly what type of device  you are using, either by setting jumpers or dip switches on the main board or by using a software setup program. The modern approach is towards machine auto-configuring by sensing the amount of memory fitted.