[Coco] Speech/Sound cartridge

[theother_bob]

The CoCo3.com version of the article loses a lot in the formatting and lacks the clear photo of where to mod the pack.
http://www.geocities.com/theother_bob/coco_page/ssc_mod.htm

Cheers,
Bob



----- Original Message ----
From: Robert Gault <robert.gault at worldnet.att.net>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Saturday, February 7, 2009 9:48:56 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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