Re: Ribbon Cable

On 12/17/2013 4:24 PM, Gerrit Heitsch wrote:
> On 12/17/2013 10:59 PM, Bil Herd wrote:
>> Several of the times when  I tried to "clean up" this kind of thing for
>> the C128 I would come across a compatibility issue; we found that third
>> parties had used the glitches on IO lines to latch R/W and that some 
>> carts
>> like the Magic Voice cart would drive the bus at unexpected times
>> including the high address lines (They would toggle /GAME and /EXROM
>> dynamically when the system had been designed for them to be solder
>> jumpers).  Eventually I stopped trying to "improve" it and try to 
>> learn to
>> "live with" it.
>
> There are other carts that are guilty of that... The feature of the 
> Easy Flash 3 that lets you use a KERNAL on the Expansionport without 
> having to remove the internal one or any internal soldering needs 
> dirty tricks like this.
>
> See here:
>
>  skoe.de/kernal/kernal-cartridge.pdf
>
> Some people like it, I don't.
Everyone's entitled to their opinion, but I think the *hack" in EF3 is 
what groups like cbm "hack"-ers would appreciate.  One could say the 
same thing about the trickery and abused done to the poor VIC-II to 
remove borders and such.

Using the MMU backwards to check for ROM at $e000 and then switching to 
Ultimax mode on access to present the KERNAL is a significant hack I think.

Jim


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