Caple C871i Manual do Utilizador descarregar pdf (Página 290)

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101

Apple II Computer Info

MB "Sound" version boards use the General Instruments AY-3-8910

Programmable Sound Generator IC. The PSG has 3 on-chip tone oscillators

(via channels A, B ,C) and a Noise Generator (NG). So, for example, the

Sound II can play up to 6 notes with 2 noises at once.

MB "Speech" version boards use the Votrax SC-01 Speech Synthesizer IC.

The SC-01 uses 64 phoneme sounds to produce speech. MB software lets you

adjust duration of each phoneme in 4 steps, create "rules" for custom

sounds, and speak sentences from text in BASIC programs.

All MB versions use the 6522 Versatile Interface IC to handle board

I/O. Except for the Sound I board, there are circuit board points to which

you can add cables to utilize I/O ports not needed for Sound or Speech.

Rubywand

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From: [email protected] (RUBYWAND)

Newsgroups: comp.sys.apple2.programmer

Subject: Re: Mockingboard programming

Date: 14 Feb 1996 10:06:40 -0500

Organization: America Online, Inc. (1-800-827-6364)

Lines: 110

Sender: [email protected]

Message-ID: <[email protected]>

References: <[email protected]>

NNTP-Posting-Host: newsbf02.mail.aol.com

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[email protected] (Victor Tan) writes:

>.... supply information about how to make a mockingboard produc

sound/music? ....

MockingBoard Mini-manual (Part 2): Sound Programming

The user can set Tone Frequency (12 bits, 4 coarse & 8 fine)* and

Amplitude (4 bits) for each channel individually. A fifth Amplitude bit

lets

you decide if a channel's Level will be "fixed" (use the Level value) or

"variable" (i.e. follow the current Envelope pattern). You can set NG

Frequency (4 bits)* but not level.

*Tone Freq = A2 Clock Freq/ [ (4096 x Coarse) + (16 x Fine) ]

Noise Freq = A2 Clock Freq/ (16 x NG value)

The Envelope of the combined outputs of enabled sources can be

controlled

for Period (16 bits, 8 coarse & 8 fine)** and, roughly, for Shape (4

bits).

**Env Freq = A2 Clock Freq/ [ (65536 x Coarse) + (256 x Fine) ]

The registers of the PSG are described briefly below:

Reg. Function & Bit(s) used

Apple II Computer Technical Information : Apple II Family Hardware Info

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