HKT-4100 emulation [Feature Request]

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I think NullDC must have this feature. You have to add support for HKT-4100 
memory card. If you don't know what is this, i'll explain. It is official 
memory card from Sega. It doesn't have screen and buttons. But it has 4x more 
memory. 800 blocks instead of 200. There are some games     
incompatible with this card. I think you should add plugin for this.

Original issue reported on code.google.com by proletar...@gmail.com on 3 Oct 2010 at 5:18

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This would be nice. While we can use up to 8 VMUs for more space, lots of games 
only allow saving to VMU A1 so more space there would be useful.

Original comment by matbur...@gmail.com on 3 Oct 2010 at 7:51

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Yes, this was what i'm talking about. It is very useful. Data storage of 
original VMU is not big enough. Only 200 blocks. Saves for some games can take 
even 90 blocks. Another issue is DLC (Downloadable content). I mean official 
addons for games from their creators - 
http://dreamcast.onlineconsoles.com/phpBB2/downloads_officialcontent.php

I didn't tested them all, but i tested some of them. According to test, DLC for 
some games works (Skies of Arcadia i mean). But they take many blocks in memory 
card. Support for HKT-4100 would be a good decision. If you have only VMU, 
you'll replace them very often. If you have HKT-4100 support, you won't have 
problems with free space.

Original comment by proletar...@gmail.com on 3 Oct 2010 at 9:46

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I can try to add that, but i fear of the problems with compat.
Wouldn't a per-game VMU option be better ?

Original comment by drkIIRaziel on 4 Oct 2010 at 8:34

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Per-game VMU option would be great imo.  Also, that way you still get the 
screen.

Original comment by Joseph...@gmail.com on 4 Oct 2010 at 10:15

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Played a bit with VMUs today, it seems that many many games don't support 
anything more than the typical vmu size. Maby its bug on my code though. Bios 
formatted up to 1669 blocks !

Original comment by drkIIRaziel on 10 Oct 2010 at 9:02

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It may be a bug, I've got one of these 800-block official VMUs and they work 
with almost every game. I think only a handful don't work (tried to Google 
which ones but couldn't find much). It also shows as 800 full blocks, rather 
than the 3rd party cards which were 4 pages of 200 blocks (with a button on the 
VMU to cycle pages).

Original comment by matbur...@gmail.com on 11 Oct 2010 at 1:35

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I have the list of incompatible games and compatible games, which have  some 
troubles with hkt-4100. Well, there are ~30 games. Dreamcast has at least ~700 
games. You can find the list in Russian wikipedia:

ru.wikipedia.org/wiki/VMU

See the last section named "Проблемы с совместимостью"
But i am not sure if this list is complete.

Original comment by proletar...@gmail.com on 11 Oct 2010 at 5:30

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There is no reason to support those cards. They still are 200 blocks and you'd 
still have to switch (bank instead of vmu, but the principal is the same).

In sort, it does not solve any problems but creates more (some stuff are not 
compatible with those).

Original comment by Mr.PsyMan on 20 Oct 2010 at 11:40

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You're right, you do still have to switch banks on the 800-block Sega card. Not 
sure what I was thinking/smoking earlier...

So we probably don't want this feature.

Original comment by matbur...@gmail.com on 21 Oct 2010 at 10:00

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But, automatic per-game switching may be good

Original comment by old.liq...@gmail.com on 20 Dec 2010 at 12:49

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does dreamcast do automatic per-game switch?

Original comment by neckil...@gmail.com on 20 Dec 2010 at 5:01