PURPOSE: To create voice data of right combination with a simple semiconductor circuit and a simple program by setting the respective low order bit values of addresses of the start position and the end position always to fixed values and changing the respective high order bit values every time to be set at the time of reading out basic voice.

CONSTITUTION: Data of 8 bits (1 byte) is stored at one address in ROM 60, and the minimum duration of unit voice of reproduced sound is 0.5 second. MPU specifies an address X1, the start address 0000 of its physical address is set on a start address counter 65 and an end address 0fff is set on an end address counter 63. The low order two digits of hexadecimal of the start address 0000 is always 00, so that MPU 52 stores only high-order two digits in counters 74, 75. As the low-order two digits of hexadecimal of the end address 0fff is always ff, only high-order two digits of is stored in the end address counter 63.