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1998-06-10
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43 lines
"The Atari A to Z"
by Mark S Baines
Copyright (c) 1998 Mark S Baines
All Rights Reserved
YOU MUST READ "READ_ME.NOW" BEFORE YOU LOOK AT ANY OF THIS FILE
*****************************************************************************
Y
YM-2149
The Yamaha-made programmable sound generator chip used in the ST-Falcon range
with three independently programmable tone generators, a programmable noise
generator, a mixer for tone and noise, analog output, fifteen logarithmically
raised volume levels and programmable envelopes. It comes in a 40-pin 0.6 inch
DIL package and is based on the General Instruments AY-3-8190 family found in
most 8-bit computers. It also performs a secondary function of controlling the
computer's parallel printer port because of its two bidirectional 8-bit
parallel ports. Each tone generator can produce a sound frequency from 30 Hz
(just within audible range) to 125 kHz (far above audible range) on each
channel. The amplitude or volume of each channel is programmable and each
frequency can have its own envelope which is a description of its attack,
decay, sustain and release characteristics. Such versatility can give each
channel different effects, such as a constant tone, a rising or an oscillating
one. Each channel can be mixed by programming with any number of others and
wired together to be output via the monitor port pin 1. Using CPU intensive
and effective programming, sound samples, such as speech or music, can also be
output to this chip and played out through the monitor loudspeaker.
Ymodem
A data transfer protocol which is derived from the Xmodem protocol with CRC-16
and 1 K blocks and incorporating a batch transmission facility so that many
files can be transferred with one command. See Xmodem, Zmodem.
Y
2 entries
EOF