Specifications

I-94 EPSON S1C62N82 TECHNICAL HARDWARE
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Melody Generator)
• Attack data (D9)
The attack data is a 1-bit data which determines whether
or not to make the break between notes clear. In each
melody first word, set this data to "1". Otherwise, there
will be no melody play even if the user starts play.
If envelope function is not available, writing "1" for this
bit will produce an approximately 12 ms rest every time
the melody ROM address increases by 1 step (i.e., at the
break of the playing of different notes). This is particu-
larly useful when the same notes follow one another. As
a rule, "1" is written on the attack bit of all words. How-
ever, when long notes other than those listed in Table
4.11.6 are desired, they can be implemented by linking
several words of the same interval to a continuous ad-
dress and at the same time setting the attack bit to "0".
On the other hand, when envelope function is available,
setting this bit to "1" will cause the capacitor for the
envelope function which is externally installed to be
recharged when the playing starts and increase the
sound pressure of the playing. Moreover, when this bit is
set to "0", since the capacitor will be continuously dis-
charged without being recharged, the sound pressure of
the playing will continue to diminish. The principle of the
envelope function is explained in details in the next
section.