Re: 6502/6510 ROM selection daughterboard

On 2012-06-03, at 23:48, Thomas Giesel wrote:

>> Running KERNAL out of Cartridge has already been implemented in
>> EasyFlash cart. I am not sure how this is done there (anyone checked
>> that?) but it seem to work, including the RAM under KERNAL.
>
> No need to check anything, it's described there:
> http://skoe.de/kernal/kernal-cartridge.pdf
>
> But be warned that this document is outdated and in
> some details even wrong, thereas the basic principle is still the  
> same.

Excellent read - thank you! And a top job finding that rather indirect  
method.

> Currently I'm cleaning up the VHDL implementation, when I've done this
> I plan to release an updated CPLD core, to update that document and to
> describe the actual implementation. The VHDL code and the hardware
> design are all open and freely available, I'll post a link here as  
> soon
> as I have finished the refacturing - please don't look there at the
> moment, it may be quite confusing to see code and comments which do/ 
> say
> something completely different ;)

:-)

  In case of CPU daughterboard, all port lines are available directly  
off the CPU itself. VIC access to this ROM is a different beast.  
Because of that I am thinking of dropping the CHAROM support for VIC  
in the first version (provided it ever materialises) and focussing on  
the CPU visible ROMs first.

-- 
SD!

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