[Coco] Speech/Sound cartridge

[Bob Devries]

Hmm, I've never done any modification around IC3 on my 2 SSC's, and they 
both work perfectly.

Caveat: YMMV

--
Regards, Bob Devries, Dalby, Queensland, Australia

Isaiah 50:4 The sovereign Lord has given me
the capacity to be his spokesman,
so that I know how to help the weary.

website: http://www.home.gil.com.au/~bdevasl
my blog: http://bdevries.invigorated.org/

----- Original Message ----- 
From: "Robert Gault" <robert.gault at worldnet.att.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Sunday, February 08, 2009 1:48 PM
Subject: Re: [Coco] Speech/Sound cartridge


> George Ramsower wrote:
>> Was there an issue with the SSC running a CC3 at 2mhz? I'm about to add 
>> this cart to one of my OS9 systems on a CC3.
>>
>> George
>>
>
> There are two sections of the device that need to be altered to run at 
> 2MHz. The internal power supply needs a change and the clock signal at IC3 
> pins 8&9 must be adjusted so the IC always sees a 1MHz clock signal.
>
> The simplest way to correct the power supply is not to change the 
> transistor but just add a small ceramic cap to supply a "feed forward" 
> signal. Switches can be used to alter the clock signal although some have 
> made this automatic.
> You can see one approach at my web site,
> http://home.att.net/~robert.gault/Coco/FAQ/SSC_hack.htm . Another is 
> posted at Coco3.com.
>
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