[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Are there any 65816 card schematics?

Michael J. Mahon wrote:

> Tristan Mumford wrote:
>> Michael J. Mahon wrote:
>> 
>> 
>>>Tristan Mumford wrote:
> 
>>>>Memory addressability is the main issue though. Like I said in another
>>>>post I could just make a banked memory card, but... well, I just don't
>>>>want to do it that way :)
>>>
>>>Accessibility of additional memory is one reason for putting the '816
>>>on an Auxiliary Memory card.  That could give the '816 a linear view of
>>>the memory and the 65(C)02 the conventional banked view (though seeing
>>>chunks of the memory as "stack" is probably not very handy ;-).
>> 
>> 
>> Once the 65816 is enabled does it actually matter what the original CPU
>> sees? especially if it is held in the disabled state. I think I'm
>> concerned about treading on the toes of the I/O in the system more than
>> anything else.
> 
> No, unless you'd like the 6502 to do something for you...

Well, if I felt like being pointlessly tricky I guess the card could release
its DMA nerve pinch on the 6502 and let it do things while the 65816 plays
with its memory above 64k. I can't see a real reason to do that though.
Although if I implemented that circuitry, I might as well have something
like a x8 PLL being toggled or something instead. That would be nice for
later though.

-brutal hack-
>>>Seriously, why not run your large-memory apps on a IIgs and save
>>>a lot of non-standard trouble?
>> 
>> 
>> A IIgs has been on my wishlist for over a decade. Every one I have found
>> has been over 1000km away and at least $100 more than I'm willing to pay
>> for one. So I use what I've got.
> 
> Wow--I think of IIgs's as $10 items--but then there's shipping.  ;-(
> The IIgs is in good supply and is relatively uncollectable!

The cheapest I've found was AU$150 plus at least AU$50 shipping. Just not
worth it for me.
Typical that what I really want is usually unobtainable.


-- 
-----> http://members.dodo.com.au/~izabellion1/tristan/index.html <-----
=====       It's not pretty, it's not great, but it is mine.       =====