Salam Farhad,

I looked at your website and the eBay auction for your GameBoy CPLD
product. Good work! However, I believe you will need a mechanical
redesign to get your board to run on a GBA (or GBA SP). A few years
ago I designed a board to run on a GBC (see
www.databoy.netfirms.com). When GBA came out I discovered that my
board would not run it, even though GBA is backwards compatible with
GBC. As someone else already commented, GBA has a micro-switch that
detectes which type of cartridge is inserted (GBC or GBA). After
some experimentation I figured out how to modify the shape of my
board to activate the switch in the GBA to place it in the GBC
compatibility mode. My modified board will now run on a GBC, GBA, or
GBA SP. I would be glad to share the details with you. Please
contact me offline if you are interested.
P.S. The photos you have on eBay show your board plugged into a GBA.
I think this is misleading because I believe your current board will
not run on a GBA.

Regards,
Yosuf Taraki

--- In gbadev@yahoogroups.com, Farhad Abdolian <ny_farhad@y...> wrote:
>
> Excellent,
> Thank you very much, it will be a great help.
>
> Does anyone here have the information about the GBA exact layout or
> knows where I can get it?
>
> TIA,
> /Farhad
> --- gb_feedback <gb_feedback@y...> wrote:
> > --- In gbadev@yahoogroups.com, "Farhad Abdolian" <ny_farhad@y...>
> > wrote:
> > > GBA is 3.3V and does not have any 5V outputs as far as I can
tell.
> > And
> > > most if not all the GBC cartridges are 5V only, is there a
trick?
> >
> > The GBA cart is notched on the side and the GBC is not. This
operates
> >
> > a switch inside the GBA to turn on 5V (and makes other
adjustments
> > such as switching on a different CPU) if a GBC cart is inserted.
GBC
> > carts work in the GBA by design, not by chance!
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>
>
>
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