[Coco] VCC v1.42 Question

[Nick Marentes]

On 15/02/2015 5:24 AM, Stephen Pereira wrote:
> Hello all,
>
> I have VCC version 1.42 running on my MacBook Pro, under Parallels running Windows XP SP3.
>
> I have not used it a whole lot, but it seems to work fine in general.
>
> Recently, I tried out my new Color Forth as modified for DECB, to be sure that it worked as it does on my real physical CoCo 3 system.  Everything works as I expected.
>
> I noticed that VCC reports that it is running a 6809 CPU at 0.89 MHz.  I have tried and tried to get the Config to set the CoCo to 1.788 MHz, but I cannot get that to happen.  I can go to the Display portion of Config and uncheck the “Throttle Speed” checkbox and get the emulation to go a super speed, but all I want to do is emulate my physical CoCo 3 which is running at double speed with an HDBDOS cartridge.
>
> What am I missing?  Is there something else that I have to do to get the overclocking to work properly?
>
>

The CoCo3 always boots in .899Mhz. There is no physical switch (such as 
a turbo) that you can set to make it boot into 1.79Mhz.

Your software needs to set the 1.79Mhz mode by writing to address $FFD9.

Nick