Re: Single tones on the Mockingboard?

[Michael Black <et472@ncf.ca>]

On Mon, 30 Jan 2012, BLuRry wrote:

> The mockingboard sample disk has some SFX routines that can be easily 
> modified for this -- I spent some effort trying to write an IRQ-based 
> playback routine but fell short of getting the darn thing to work 
> correctly!
>
> Tom Charlesworth actually pulled off a great conversion of a Speccy 
> chiptune to playback on the mockingboard.  (Cybernoid)
>
> http://www.tomcharlesworth.pwp.blueyonder.co.uk/Cybernoid.dsk
>
> Anyway, I remember one thing that kicked my butt: If you don't init the 
> card properly, it will basically do nothing with you data.  I think it's 
> more of a 6522 thing than it is an AY thing though, if my hazy memory is 
> working at all.

I wouldn't remember either.

But the 6522 did need initializing.

And the 8910 was generally hooked up so you controlled its address pins 
with a parallel port, so you had to address the right register in the 8910 
before you could send it data.

But it was simple, since for just a single tone, you could just leave it. 
If anything, you didnt' want that, so you had to do something to turn off 
the tone before it drove you nuts.

  Michael