Re: C64 8K autostart ROM cart schematic?

Re: C64 8K autostart ROM cart schematic?

From: Marko Mäkelä <>
Date: Mon, 23 Mar 2009 11:09:38 +0200
Message-ID: <20090323090938.GB12887@x60s>
On Mon, Mar 23, 2009 at 03:36:10AM -0500, Jim Brain wrote:
> /CE and /OE?  Cna I just tie /OE to GND and tie /CE to /ROML?  OR, do I  
> need to tie them both to /ROML?

Either approach should work.

> I want to verify it is /EXROM that I pull low to engage the cartridge in  
> the memory map.

If you pull EXROM low, ROML will be triggered when reading $8000..$9fff.
For writes, you would have to decode the addresses yourself, and then the
data would also end up in the internal RAM at $8000..$9fff.


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Received on 2009-03-23 10:34:40

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