| 摘要 |
PURPOSE:To shorten the processing time by providing a storage means for operation having a register group where various musical sound parameters are exclusively stored and a data storage means which is indirectly addressed through this register group. CONSTITUTION:A RAM 34 consists of the register group and is exclusively used for operation of musical sounds. Various musical sound control parameters and musical sound waveform data are stored in a ROM 37 for control data as well as waveform as the data storage device. Register contents on the RAM 34 designated by the operand of a program in a control ROM 31 are referred to indirectly access the ROM 37. Only registers exclusively used for operation of musical sounds are used in the execution of the musical sound generating program in this manner. Consequently, registers used by another interrupted program are not rewritten during the execution of the musical sound generating program. Thus, it is unnecessary to save and restore the process state, and the processing time is shortened. |
