| 摘要 |
PURPOSE:To allow a user to write or read additive information without increasing the number of terminals nor reducing the storage capacity of a main memory by adding the 2nd memory cell array stored with the additive information in addition to a memory cell array for practical use and using a gate which operates only at levels except that of TTL to obtain a multifunctional terminal. CONSTITUTION:The 2nd memory cell array 5 is stored with the additive information such as an identifying code, etc., and the 2nd X decoder is a decoder for the identifying code. A Y decoder 3 and an output circuit 4 are invariably activated when the 1st memory cell array 1 is activated and when the 2nd memory cell array 5 is activated. When a level other than the TTL level is inputted to a terminal Ai, the 2nd memory cell array is activated and the 2nd memory cell array is inactivated, and when the TT1 level is inputted, they are activated and inactivated reversely. |
