KERNAL cartridge

From: Jim Brain <>
Date: Thu, 18 Nov 2010 16:13:18 -0600
Message-ID: <>
Given the fact that many C64 machines have non socketed KERNAL ROMs, I 
continually receive requests for a KERNAL ROM cart.

Academically, I see how to do it by driving ULTIMAX mode during 
$e000-$ffff reads, but that only works when RAM is banked out.  Does 
anyone have an ideas on how to accomplish that?

I know I could implement a mirror for $0 and $1, but folks say those 
addresses and the R/W signal don't show on the external bus.  
Implementing a complete 6510 on the cart to mirror the internal 6510 
might work (discarding write operations), but that's truly a brute force 
approach and hardly seems worth the effort.


Jim Brain, Brain Innovations                                      (X)
Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times!

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Received on 2010-11-18 23:00:13

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