Hi there,

Nah can't say I've ever heard of you ..... ;-)

Ooooh so it can be used as a FPGA project board as well ? .. That'll
be nice, my little EP1C board is interesting but although it has a VGA
connector on it I don't think it can generate a vga signal of the
proper clock (seem to remmber you need a 25mhz clock and this only has
a 20mhz) .. like I said before .. i'm an FPGA newbie :-)

Will the Chameleon have any other I/O ports ? (apart from the
obligatory clock port that a certain "invididual" crams onto every
single peice of hardware he has a say in :-) .. or is this getting
towards feature creep again ? :-)

On another completely different topic ... what hapened to the A600
accelerator ? hehehe

Regards

Mark



--- In chameleon_64@yahoogroups.com, Jens Schoenfeld <jens@...> wrote:
>
>
> Hi,
>
> first of all, happy new year everyone on this
> list. I'm the one who makes the hardware of
> Chameleon, just in case my name is not familiar.
>
> At 21:33 07.01.2009 +0000, Mark wrote:
> >Hi there,
> >
> >Well I'd buy it just for a FPGA on a cart .. so there you have one
> >customer! :-)
>
> Good - then you might also like to hear that the
> cartridge will also work stand-alone (that's why
> it'll have the PS2 keyboard connector).
>
> >So if the 6502 and VIC cores are accessing their own private RAM on
> >the cart, can they get access to the memory space of the real C64 ?
> >Or do they have to page it in via something like a REC ?
>
> The internal C64 memory is completely switched
> off. You can remove it, if you like. The C64's
> VIC reads its data from the Chameleon ram, which
> is the major difference to any accelerator out
> there. While all other accelerators have to slow
> down to poke into the C64 memory, Chameleon does
> not have this "penalty". The one thing where
> Chameleon has to slow down is a write to colour
> ram, this cannot be replaced externally.
>
> >What about peripherals ? (joysticks, user port devices, devices on
> >the serial bus etc) Would you have to page the carts RAM down into
> >the the C64 RAM, then have the real 6510 pick up where the 6502 core
> >left off and access the device, copy the data into the C64 RAM and
> >then have the 6502 core take over again and page the data from real
> >RAM back into the cart and process it .... my head hurts now :-)
>
> No need to - normal bus access is still possible,
> so the 6502 inside Chameleon can read/write CIA
> and all other registers as if they're local.
> Other accelerators also don't have problems
> accessing SID, VIC and CIAs, so why would Chameleon have a problem?
>
> And yes, it's truly a fun project. Lots of things
> to learn about a machine that is considered to be "well known" ;-)
>
> ciao,
> --
> Jens Schönfeld
>