Re: 6502/6510 ROM selection daughterboard

On 2012-06-04, at 16:28, Gerrit Heitsch wrote:

>>>> I am not sure that the CHAROM could be replaced in this way. I  
>>>> don't
>>>> think it can be replaced with a 6510 daughterboard either, at  
>>>> least not
>>>> without redirecting some PLA lines.
>>>
>>> No, any of these methods cannot replace character ROM.
>>
>> For CPU it should work, right? But for VIC it remains tricky. VIC  
>> lines
>> come into picture /me thinks..
>
> The Char-ROM is parallel to the other ROMs when it comes it address  
> and data lines. The only special signal it needs is its _CS signal  
> which is generated by the PLA. Since this is only one signal, the  
> easiest way would be to grab it from the PLA pin 15.
>
> Regenerating it from scratch needs a lot more signals.

Gerrit, you know what? I think you are right! And I actually have no  
idea why I tried to make this more complicated than necessary.. do  
you? ;-)

-- 
SD!

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