On Wed, 16 Jun 1999 gentlben@xxxxxxxxxxxx wrote:
> > Well, for a simple 2k or 4k game, it's extremely simple. Address lines A0
> > through A11 from the 6507 connect directly to the corresponding pins on the
> > rom.
>
> do data lines D0-D7 also connect directly to the pins?
Oops! Sorry! Yes, this is correct: :}
> obviously this has something to do with the fact that the atari 2600 can address
> only 13 bits of memory :P but it seems if i were to ever produce a circuit of this
> kind,
> it goes without saying i would have to use an eprom, doesnt it?
Yep. There are no read/write, enable, or clock lines in the cartridge port. So you
have to secrifice an address line. Or two. Or more if you want these functions...
> i would imagine bank switched games are a little more complex, given the fact that
>
> they may use several rom chips or even ram on the circuit board...
Or coprocessors in the case of Pitfall ][. Yeah, it can get pretty Harry!
(Eeeeewwww....bad pun intended...)
:P
-Chris
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