Caple C871i Manual do Utilizador descarregar pdf (Página 291)

100

101

Apple II Computer Info

00 A Freq. fine (0-7)

01 A Freq. coarse (0-3)

02 B Freq. fine (0-7)

03 B Freq. coarse (0-3)

04 C Freq. fine (0-7)

05 C Freq. coarse (0-3)

06 NG Freq. (0-4)

07 Enable =0/ Disable =1

NG on A (5) on B (4) on C (3)

Tone on A (2) on B (1) on C (0)

Ex: Writing $F0 to Reg 07 plays tones A, B, C plus noise on C

08 A Level (0-3) and

Envelope Control (4): 1 = Use Env; 0 = Use Level value

09 B Level (0-3) and ...

0A C Level (0-3) and ...

0B Envelope Period Fine (0-7)

0C Envelope Period Coarse (0-7)

0D Envelope Shape (four bits)

Continue (3) 0= do 1 cycle and set Level to zero

Attack (2) 1= count up 0= count down

Alternate (1) 1= reverse count direction each cycle

Hold (0) 1= do 1 cycle and hold count

To program the MB you write to the board's 6522 I/O chip(s). All

addresses reference here are for a MB Sound II (2 Output channels) in Slot

$C400 ORB1 function to perform, OUT 1

$C480 ORB2 function to perform, OUT 2

$C401 ORA1 data, OUT 1

$C481 ORA2 data, OUT 2

$C402 DDRB1 data direction, OUT 1

$C482 DDRB2 data direction, OUT 2

$C403 DDRA1 data direction, OUT 1

$C483 DDRA2 data direction, OUT 2

Before sending music, etc. data to the MB you must Initialize the board's

I/O. To Initialize the 6522's: Store $FF at $C402 and the other three

DDRxx addresses. This needs to be done by your program just once.

Your program gets access to a PSG via the 6522 by using a few basic

Function codes which set the PSG's I/O control lines:

Set Inactive = $04 Set PSG Reg# = $07 Write Data = $06 Reset = $00

To Write to a PSG register: Tell the PSG which Register you wish to access

(i.e. Set the "current register" #) and Write the data. This is easiest to

do with subroutines to handle the basic Functions.

Example Subroutines (for Output Channel 1):

Set Reg # 1000: A9 07 8D 00 C4 A9 04 8D 00 C4 60

Write Data 100B: A9 06 8D 00 C4 A9 04 8D 00 C4 60

Apple II Computer Technical Information : Apple II Family Hardware Info

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Caple C871i Manual do Utilizador Página 291

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