Remote-processing RPC-30 Uživatelský manuál stáhnout pdf (Strana 33)

CHAPTER 10 SPEAKER

RPC-30 Page 31

Figure 10-1 Jumper W8 and speaker

DESCRIPTION

A modem quality speaker is installed on the cir cuit

board. Useful fr equency r ange is 200 to 4000 hz. Both

frequency and duration are set by the SOUND

command.

The speaker must be disabled w hen a 512K R AM is

installed. This is due to the fact one of the address lines

is also used as a fr equency output.

The AIN command also shuts off the SOUND.

Speaker output is controlled by jumper W8.

[1-2] Speaker disabled, 512K RAM installed

[2-3] Speaker enabled, < 512K RAM installed

The following example produces tones from 200 to 5000

hz and back down again in 500 hz increm ents.

10 FOR N = 200 TO 5000 STEP 500

20 SOUND N,.5

30 NEXT

40 FOR N = 5000 TO 200 STEP -500

50 SOUND N,.5

60 NEXT

70 GOTO 10

To stop program execution, press the < esc> key.

The AIN and AOT comm ands will shut off the sound.

NOTE: When SOUND is used with a time parameter,

program execution is suspended until it is timed

out. Executing SOUND with a time parameter

has the same effect on a program as executing

the DELAY statement.

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Remote-processing RPC-30 Uživatelský manuál Strana 33