Steve Nickolas

I'm reading through everything I can find any trying to find any simple
info on programming the Mockingboard. (it has to do mainly with something
not exactly Apple-related that I am using Apple hardware to test and base
my design on.)

Basically - I'm just trying to get a single quick "dink" or such out of a
MB. I'm just failing to "get" something simple again, I think. :/

-uso.

Antoine Vignau

The answer may be @
http://mirrors.apple2.org.za/Apple%2...0Mockingboard/

Antoine

Steve Nickolas

On Mon, 30 Jan 2012, Antoine Vignau wrote:

> The answer may be @
> http://mirrors.apple2.org.za/Apple%2...0Mockingboard/
>
> Antoine
>

Possibly. The stuff here does go into greater detail.

-uso.

Steve Nickolas

Replying to myself.

I figured out the data the 8910 wants (using the Mockingboard exerciser),
but I seem not to be implementing the code right.

Here's my code, it's supposed to initialize the board when entered from
36864/$9000 and then beep the 8910 when entered from 36867/$9003. The
second call just does a short pause - no sound. :<

-uso.

;these values were determined empirically with the MockingBoard exerciser:
;
;Tone Control Fine 80($50) (register 0/2/4)
;Tone Control Coarse 0 (register 1/3/5)
;Noise Period 0 (register 6)
;Enable Mask 62($3E) (register 7)
;Amplitude 15($0F) (register 8/9/A)
;Envelope Fine 0 (register B)
;Envelope Coarse 0 (register C)
;Envelope Shape 0 (register D)

ADR6522 = $C400

.org $9000
signon: jmp init
entry: ldx #$00
ldy #$80
jsr push
ldx #$02
jsr push
ldx #$04
jsr push
ldx #$07
ldy #$3E
jsr push
ldy #$0F
inx
jsr push
inx
jsr push
inx
jsr push
ldy #$00
ldx #$01
jsr push
ldx #$03
jsr push
ldx #$05
jsr push
inx
jsr push
ldx #$0B
jsr push
inx
jsr push
inx
jsr push
lda #$00
tax
tay
@1: inx
bne @1
iny
bne @1
@2: jsr push
inx
cpx #$B
bcc @2
rts

push: sty ADR6522+1
jsr setreg
stx ADR6522+1
jsr setdata
rts
init: lda #$FF
sta ADR6522+2
sta ADR6522+3
reset: lda #$00
sta ADR6522
beq common
setreg: lda #$07
sta ADR6522
bne common
setdata: lda #$06
sta ADR6522
common: lda #$04
sta ADR6522
rts

Michael J. Mahon

Get the datasheet on the 6522 and the AY-8910 datasheet and all questions
will be answered.

-michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon

Michael Black

On Mon, 30 Jan 2012, Michael J. Mahon wrote:

> Get the datasheet on the 6522 and the AY-8910 datasheet and all questions
> will be answered.
>
Is it that simple?

It is indeed really easy to do simple things like generate a tone with
that combination. It's making more complicated sounds or music that
rquires effort.

Michael

Steve Nickolas

On Mon, 30 Jan 2012, Michael Black wrote:

> On Mon, 30 Jan 2012, Michael J. Mahon wrote:
>
>> Get the datasheet on the 6522 and the AY-8910 datasheet and all questions
>> will be answered.
>>
> Is it that simple?
>
> It is indeed really easy to do simple things like generate a tone with that
> combination. It's making more complicated sounds or music that rquires
> effort.
>
> Michael
>
>

Fortunately, a simple beep's all I need.

-uso.

Sean Fahey

On Monday, January 30, 2012 1:45:30 PM UTC-6, Steve Nickolas wrote:

> Fortunately, a simple beep's all I need.

Beep.

Steve Nickolas

On Mon, 30 Jan 2012, Sean Fahey wrote:

> On Monday, January 30, 2012 1:45:30 PM UTC-6, Steve Nickolas wrote:
>
>> Fortunately, a simple beep's all I need.
>
> Beep.
>

LOL.

Actually, I'd been thinking of how I could design a "neovintage" computer,
and put concepts of various computers into a blender. I figured for a CPU
I'd use a 65C02, for video 6847, for audio AY-8910. As far as sound goes
that meant the hardware would basically be a Mockingboard mapped to a
different address. >:P

I prolly won't be able to design a physical version but I've been trying
to design it practically, as in, would this work if the machine were
really built with the tech of the time?

Conceptually, though, I could in fact implement it in *software* - just
like one would implement an emulator. And if I needed to learn anything
in the process, I could rewrite Dapple with the new knowledge too.

Implementing a system beep via the Mockingboard sounds impractical, but
against the masterplan it was what I wanted to do.

(BTW, a Fine tone of "69" is closest, afaict, to the system bell. I think
80 sounds better though. And if I could somehow make a "dink" instead of
a simple beep that would be nice too.)

-uso.

D Finnigan

Sean Fahey wrote:
> On Monday, January 30, 2012 1:45:30 PM UTC-6, Steve Nickolas wrote:
>
>> Fortunately, a simple beep's all I need.
>
> Beep.
>

CTRL-G.