| 摘要 |
PURPOSE:To save the trouble of performing arithmetic again by keying from the beginning, by making it possible to reset the internal state of a computer to the state before the final operator up to that time is substituted, even after an arithmetic result or arithmetic halfway result is found through a series of calculation. CONSTITUTION:For example, when ''456'' is added to ''1234'', performing arithmetic of ''123(+)'' executes arithmetic addresses m1-m6 on the flowchart, and the X register is stored with ''1234'', an operand. The keying operation of ''456(=)'' executes arithmetic addresses m1-m6 similarly and the sum of ''1234'' and ''456'' is stored in the X register. Simultaneously, operator ''456'' is transferred from the Z register to the Y register and stored in the Y register. Here, if operator ''456'' is incorrect, the ADD.C key which is a correction key is operated to set FF2. Then, addresses m2, m7, m8, and m1 are executed in sequence. |
