| 摘要 |
PURPOSE:To attain the input of a formula after memory overflow, by operating a formula inputted before the memory overflow, storing it in a key memory and clearing data after operation. CONSTITUTION:Let the storage capacity of the key memory 14 be for 50 keys' share in terms of the number of times of key operations. In inputting a long fornula exceeding this limit, the types of the operation key are discriminated at a control section 11 from an output of a key input section 2 and a required step processing is done afterward. The number of times of key operations is stored in an A register in an operation register, and an operation section 13 discriminates whether or not the data in the A register is >=51 or not. If the section 13 discriminates that it is >=51 at the end of a key input, a flag is set, and the data is read out and operated at the operation section 13 from the head of the key memory. Thus, the content of the A register is decreased, the content of the A register is discriminated by the operation section 13 again and when it is discriminated the content is <=51, the data of the formula read out so far is cleared and the remaining data are all shifted right. Further, the successive operation processing is done. |
