Caple C871i Manual do Utilizador descarregar pdf (Página 82)

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Apple II Computer Info

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### FILE : digitize

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### Created : Sunday, January 14, 1996 Modified: Sunday, January 14, 1996

### File Type: "TEXT" File Creator: "LMAN"

### File Size: 3217 bytes 3 KB

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Path: ns-mx!hobbes.physics.uiowa.edu!news.iastate.edu!vaxe.iastate.edu!TWBV4

From: [email protected] (Ian Schmidt)

Newsgroups: comp.sys.apple2

Subject: Re: Sound Digitization

Message-ID: <[email protected]>

Date: 17 Dec 91 15:33:21 GMT

References:

<[email protected]>,<[email protected]>

Sender: [email protected] (USENET News System)

Reply-To: [email protected]

Organization: Iowa State University, Ames, Iowa

Lines: 71

Okay, here goes, the official AudioZap Digitizing Method. :-)

Set BufPtr to a pointer to the buffer for digitizing and EndPtr to

the ADDRESS (not byte count) of the end of the buffer.

As always, its in ORCA/M ASM65816 1.2 format.

; DP Equates

BufPtr equ 0

EndPtr equ 4

; other equates

IRQ_Volume equ $e100ca

SCtl equ $c03c

SData equ $c03d

SAdrL equ $c03e

SAdrH equ $c03f

Kbd equ $c000

Strobe equ $c010

DigitizeIt START

sep #$20

longa off

lda #0

pha

plb

lda >IRQ_Volume

and #$0f

ora #$20

sta SCtl

lda #$e2

sta SAdrL

LoopIt lda Delay ; digitizing rate; see why Hertz in AZ ain't

dec a ; gonna happen?

bne LoopIt

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 82 of 572

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Caple C871i Manual do Utilizador Página 82

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