Re: Carte Blanche update

[Alex Freed <alex_news@mirrow.com>]

Michael J. Mahon wrote:
> > I tried something similar - namely kept the 6502 in a not ready state by
> > pulling the RDY down and accessing $C000 by DMA. This part worked but 
> > for some reason reading $C010 did NOT reset the keyboard flag. I don't 
> > know why: decoding is done inside a black box ASIC.
>
> Strange--that's how the 6502 resets it...

I know. There are two explainations:

1. The MMU chip (that has DMA as an input) for some reason doesn't 
decode this address when DMA is active.

2. I made a mistake and didn't notice something.

Once the CB boards are finished in a few days everyone will have a 
chance to experiment.

-Alex.