Commodore 128D - Page 309

SLEEP
n
SLOW
SOUND
r\
—Delay program for a specific period of time
SLEEPN
where N is seconds 0< N < 65535.
—Return the Commodore 128 to 1 Mhz operation
SLOW
The Commodore 128 is capable of running the 8502 microprocessor
at a speed of 1 or 2 megahertz (Mhz).
The SLOW command slows down the microprocessor to 1 Mega
hertz from 2 Megahertz. The FAST command sets the Commodore
at 2 Mhz. The Commodore 128 can process internally substantially
faster at 2 Mhz than at 1 Mhz. However, there is no increase in the
speed of input and output to peripherals. The 8502 microprocessor
defaults to 1 Mhz speed.
—Output sound effects and musical notes
SOUND v9ff>d[l[dir][9[m]I9[s]Ii[wH,Pim]
where : v = voice (1..3)
f = frequency value (0..65535)
d = duration (0..32767)
dir = step direction (0(up) ,1(down) or 2(oscillate)) default = 0
m = minimum frequency (if sweep is used) (0..65535)
default = 0
s = step value for sweep (0..32767) default = 0
w = waveform (0 = triangle, 1 = sawtooth,2 = variable,
3 = noise) default = 2
p = pulse width (0..4095) default = 2048
The SOUND command is a fast and easy way to create sound
effects and musical tones. The three required parameters v,f and d
select the voice, frequency and duration of the sound. The duration
is in units called jiffies. Sixty jiffies equals 1 second.
Complex sounds can be made by mixing the outputs of the three
voices available. If two sounds are started for the same voice, the
second one waits for the first to finish. To stop a sound already in
progress, specify a duration of 0 for that voice.
301 BASIC 7.0 ENCYCLOPEDIA—Basic Commands and Statements