[Coco] How does the SCS line / GIME Setting Work?

[jdaggett at gate.net]

Okay 

I am not going to argue the point anymore. I just think you are wrong. If not, then Kevin 
Darling was wrong.  I will leave it al that.

james

On 19 Jun 2010 at 14:37, Darren A wrote:

> On 6/19/10, jdaggett at gate.net wrote:
> > The MC2 bit of the INIT0 ($FF90) register controls what is encoded onto the
> > S BUSS when
> > the MPU addresses in the range of $FF40 to $FF5F. Only a 16 bit window is
> > active at
> > anytime. When the MC2 bit is set then we have the standard SCS which is
> > encoded as $011
> > on the S BUS and then when the MPU addresses in the range of $FF40 to $FF4F
> > then bit #6
> > of the LS138 is asserted low.
> 
> ---
> 
> That is not correct.  When the MC2 bit is set, the entire 32-byte
> range of FF40-FF5F causes bit 6 of the LS138 to go low. This matches
> the way the SAM works.
> 
> Darren
> 
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