2114 RAM tester

4-40 - elektor april 1982 2114 RAM taste 2114 RAM tester A memory IC is a tiny "black box" in that none of its inner activities can be seen from the outside. We have to rely on the facts and figures published in data sheets. It is extremely difficult to know whether the IC is functioning properly, since about as much is going on inside as at the London stock-exchange! Where digital data is concerned, however, operators can find out how the IC will react to a certain logic input signal, using for instance the 2114 IC tester introduced here. The 2114 RAM is a highly popular IC and is used in just about every type of personal computer. Consequently it has dropped in price considerably in recent years. Nevertheless, quite a few RAMs are required for a computer to have a reasonable memory capacity, so that it would be nice if they could be tested there and then in the shop - with the dealer"s permission, of course! - to avoid buying any "duds". Before we consider the circuit, let"s...