Specifications

S1C62N82 TECHNICAL HARDWARE EPSON I-83
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Melody Generator)
Note
(i) Scale ROM
This is a mask ROM in which 31 scale types which have
been optionally selected and created from either C3–C6
#
(available output frequency range: 4,096 Hz–125.5 Hz;
without frequency booster) or C4–C7
#
(available output
frequency range: 8,192 Hz–251.1 Hz; with frequency
booster) are stored beforehand. The 15 available ad-
dresses are "00H"–"1EH". Word length is 8 bits; the data
written on them and the corresponding scale (frequency)
generated are shown in Tables 4.11.5 (a) and (b). The
maximum value which may be written as a data is "FDH".
The address is specified by the melody ROM output and
the output is entered in the interval generating circuit.
Bear in mind that the range of the data which can be written on
the scale ROM is from "00H" to "FDH". If any data beyond this
range is written, the interval generating circuit will not function
normally.