A word about Sport Games: The raw read from the chip is different from just stitching the individual ROM images of the three games included together. This means that Bock will need to do correct redumps of the Game Box series for Master System as well. He just ripped the individual ROMs which is not really accurate. Neither regarding ROM chip content nor emulation of this reset-triggered switching mechanism.

Hi,
there are some answers.

> Do you know the right ROM order? As far as I understand it,
> the way to know would be to dump the ROM directly.

Yes, I am sure of rom order because I dumped this chip directly (unsoldered
rom chip and read it in eprom reader). Order in rom:
1. Wimbledon (256KB CRC32 B14B6195)
2. Great Volleyball (128KB CRC32 8D43EA95)
3. Super Futebol II (128 KB CRC32 551E6F51)

> Does the logic garantee a same order?
> Are you able to explain the board game switching logic?

Order looks same as in Master Games1 (256,128,128)

I never tried to analize this logic, I just assumed that all games in cart
are using standard 315-5365 mapper and additional logic, which contains
counter (74HC163), is used to switch games just by setting lines A18 and A17
high.
I think it works this way:
A start everything is reset: A18 is low, A17 from 5365.
At first reset: A18 is high, A17 from 5365 (always low, because game is
128KB only).
At second reset: A18 and A17 are high.
At third reset everything is reset as at start etc.

When I'll have some time, I'll check it, but I think I'm right.

> Does mapping page >0x10 in Columns/World Soccer mode or
> page >0x20 gets you pages from the same game or other games?

As I wrote above, I think that in all cases only pages of one game are
visible at all time (hard wired address lines).

> Does bits 0-1 of register mapped at 0xFFFC can switch
> games?
> This thing is documented in the official SMS doc (dev4.gif)
> and the official GG doc (main-5.gif). I never really
> investigated those bits. I suppose it is mapper dependant,
> but I wonder what mapper support that and if those
> compilation game relies on that.

When I analise all logic connection on this cart, I'll be able give you some answers on these qusetions, but I think that, in this case, only line, used to switch games, is reset line. Probably line A18 is not connected to 5365, because when I was trying to dump this cart normal way I was always receiving only image of first game.

> I could not dump anything from SMS III Collection of SMS Handy however.
> Port (3E) wouldn't react. I don't have the knowledge to dump those
> small ROM chip. Did you try?

It will be not easy, but I am planning to dump these bioses. It is only
matter of time.

> I noticed something that I could not explain about the SMS III collection,
> which is that the menu screen play a music which doesn't sound like PSG
> music at all. I wonder how they do that. Do you think thay they used
> custom hardware for that?

They are not using standard Sega chips - all console is in just 2 chips -
made by Tec Toy. Maybe they designed one chip for use in new Master System
and Mega Drive, and this menu are using Mega Drive sound?

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