RE: 8kernal/8modules for c64-II ?
Date: 2007-04-02 07:17:59

Hallo ATT,

> Okay. Let me think about this again, Ruud:
> IF A13=1 then Memorywanted=somewhere between e000-ffff (KernalROM)
> ELSEIF A13=0 then Memorywanted=somewhere between a000-bfff 
> (BasicROM) ?


> So if A13=0 then I must Chipselect. This is not an OR gate, 
> it is an AND gate, isn't it?

No. Write down the 0/1-tables for both and you'll see that you need the OR gate.

> Is this correct?

I'm terribly sorry but I haven't seen your schematic yet for various reasons. The OR gate solution should work for sure but I can image that incorperating the A13 signal in an existing circuit can work as well.

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