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- "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
- *****************************************************************************
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- Y
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- 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.
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- Y
- 2 entries
- EOF
-