Specifications

S1C62N82 TECHNICAL HARDWARE EPSON I-93

CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Melody Generator)

• Note data (D6–D8)

Note data are data which indicate the notes to be used.

As shown in Figure 4.11.14, note data are written on 3

bits: D6–D8. There are 8 types of notes which can be

used in the S1C62N82 Series and the corresponding 3

note data bits are shown in Table 4.11.6. Although notes

shorter than 32 notes may not be played, notes longer

than 2 notes may be played by operating the above-

mentioned attack note. This procedure is explained in

the section on attack data.

Table 4.11.6

Note data and notes

• Scale data (D1–D5)

Intervals to be used are pre-written on the scale ROM.

There are 31 scale ROM addresses which can be used:

"00H" to "1EH". The addresses are written on the 5 bits

(D1–D5; see Figure 4.11.14) which serve as interval data

area. Intervals written on the interval ROM address

which has been specified with the interval data (refer to

Tables 4.11.5 (a) and (b)) are generated at the interval

generating circuit. Although the scale ROM addresses

are only from "00H" to "1EH", "1FH" also exists in the

hardware and is set for silent notes. Because of this,

writing "1FH" on the melody ROM interval data area will

result in the playing of silent notes. The length of a silent

note depends on the note data written on the same word.

D6 Note