[Coco] On John Linnville's Color Computer Game Master Cartridge Design

[John W. Linville]

On Wed, Aug 02, 2017 at 04:41:34PM -0600, Darren A wrote:
> On Wed, Aug 2, 2017 at 3:14 PM, John W. Linville <linville at tuxdriver.com>
> wrote:
> 
> > On Wed, Aug 02, 2017 at 12:53:24PM -0600, Darren A wrote:
> > >
> > > I have been going through the same exercise recently.  Before trying to
> > > write some HDL for a CPLD implementation, I rigged up the following
> > circuit
> > > on a breadboard for testing:
> > >
> > > https://drive.google.com/file/d/0B_o8KocZC3DSenp4em0xWFloOVk/
> > view?usp=sharing
> >
> > Does this design work? At first glance, it doesn't seem right to me.
> >
> 
> 
> Yes, I have it working on a breadboard, as shown.  I know the address
> decoding is too simplistic, but I just wanted a quick way to test the
> interfacing with parts I had on hand.
> 
> What doesn't seem to be right?

I guess it just looks a bit different. Probably driving the READY/CE^
line from the inverter seemed strange too. But now that I have looked
closer I think it is probably OK.

John
-- 
John W. Linville		Someday the world will need a hero, and you
linville at tuxdriver.com			might be all we have.  Be ready.