[Coco] s/sc on os-9 l2

[Robert Gault]

Willard Goosey wrote:
> On Thu, May 09, 2013 at 10:18:12PM -0400, Luis Antoniosi (CoCoDemus) wrote:
>> the s/sc seems to be useless on level 2 since it doubles the clock needed
>> for the speech and sound generation. Is there any fix for that ?
>
> First, the 2MHz fixes include a switch to control which clock rate is
> fed to the YM chip -- E or doubled-E.  Fancier versions of this fix
> auto-detect!
>
> Second, the speech chip is completely unaffected by the E clock rate
> and sounds the same at either speed.
>
> Willard
>

In addition to the switch, I've found it necessary to cause more high frequency 
signal to feed to the -6v power supply. I put a 470pf cap across R16.