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Pseudo Saturn Kai - Black Saturday !

Written by cafealpha 4 comments
I was away from keyboard (and fortunately away from shopping malls too) during this Black Friday, so I am a bit late to celebrate this marvelous commercial event.

But any date isn't late to celebrate something, so let's tweak a little the event name and officially open the ...

!!! Pseudo Saturn Kai - Black Saturday !!!
 80% OFF on First Download
 Second Download Offered

The event is open all year, so everyone including latecomers should get their 80% off on first download

Read more Pseudo Saturn Kai - Black Saturday !

X-Terminator Cartridge Revival

Written by cafealpha 3 comments
This article is not about my own development experience, but from my friend XRider. Thanks a lot to him for the good work and the permission to share his pictures

First, what is a X-Terminator cartridge ? It is a Saturn flash cartridge which provides the following features :
 - 1MB expansion RAM
 - Backup memory
 - Ability to play import games
 - Cheat codes
 - Ability to search cheat codes by using standalone "X-Assist" unit


X-Terminator cartridge and X-Assist
Image taken from SegaRetro

X-Assist is particularly convenient because unlike Action Replay cartridges, it doesn't requires connection to a PC : it is true that connection to a PC provides more features (such as memory access, program upload, etc), but as "connection to PC" basically means "software support will be dropped someday", a standalone unit is a real treasure
For example, do you remember that Action Replay cartridges initially had DB25 connector ? This was for connecting the cartridge to PC via the -sold separately- Comms Link board, whose used now obsolete ISA port, and consequently not supported on nowadays PCs and/or OS.
There are some alternate solutions for connecting Action Replay to PC, whose major one is USB Data Link, but unfortunately it doesn't provides any software support for advanced features such as cheat codes search and testing.
So if you want to search cheat codes for your favorite game, X-Terminator is a good choice ! ... Okay, the user interface is in Japanese, but that's just a detail : after 200 or 300 hours learning about it, it shouldn't cause any problems

On the other hands, the major limitations are probably the lack of 4MB expansion RAM support, and using flash ROM for storing backup save data (which on the long term may brick the cartridge), but for a cartridge developed more than 20 years ago, theses limitations are quite honorable


So, once upon a time, XRider found a X-Terminator cartridge. It was a cheap auction, but on the other hand the cartridge didn't boot anymore, and the X-Assist unit wasn't included

Normal people would add this cartridge to their collection or put it on display as a decorating vintage objet Other people with engineering and electronics education background would put it on their "to repair someday" cardboard, and don't touch it for the next 20 years because they are busy with other projects or work, or real life, or all of theses at once

But XRider is none of them. XRider owns soldering tools. And knows how to use them. And really wants to fix this marvelous cartridge

So, let's try to fix the cartridge ! The first step would be to start with the most common problem, which is broken flash ROM.
In my opinion, this is the most difficult step, because it requires to desolder two chips for a total of 64 pins !
I personally can't do this because of lack of appropriate tools, so the alternate desoldering way I would had used would be to ... use a nipper and cut each pins

Fortunately, XRider likes work well done, so theses chips were removed in a clean way


X-Terminator cartridge, with flash ROM chips removed.
Additionally, all capacitors are removed too : that's
the occasion or never to replace them

Next step is a bit optional, and is about to dump removed flash ROM chips with flash ROM dumper device. This is the best way to verify if failure is due to corrupted flash ROM chips, and if still in working condition, this at least would be an occasion to dump the cartridge's firmware


Flash ROM chip on dumper device.

Dump is full of 0xFF bytes ... unless a miracle happens, theses flash ROM chips are no longer functioning  But, this comforts us regarding initial supposition of broken flash ROM chips causing cartridge not booting
 
Just in case of, let's verify PCB traces around flash ROM chips while theses are removed : this takes only 5 minutes to check, and it would be frustrating to find that cartridge was not working because of broken trace after soldering new flash ROM chips


PCB traces : just requires a light source
strong enough to be seen


What to do next ? Maybe use PLCC sockets so that future replacement of flash ROM chips would be easier ! That's a couple of weeks to wait for the postman, but worth the wait
PCB with PLCC32 sockets soldered

And then, simply replace the flash ROM chips

Next generation is here !


PCB with new flash ROM chips.
Additionally, new capacitors are populated


One last step remaining ! Flash ROM is mounted, but ROM itself needs to be set up with X-Terminator firmware. The simplest way to do this is to use Pseudo Saturn Kai flasher utility : it obviously allows to install Pseudo Saturn Kai, but also several other legacy firmwares in the case someone would want to revert to initial firmware after trying Pseudo Saturn Kai.


Just select the ROM version you want to install,
and follow on-screen instructions

 
Flashing in progress ! Will it work after that ?!


Yeehaw !!! It boot fine, mission done
Let's try with Metal Slug ...

Metal Slug works too !
So it seems there's no need to replace RAM chips


Everything finished ? No, there is a side quest remaining Among the couple of X-Terminator cartridges XRider owns, one X-Assist (pad and LCD unit used to search cheat codes) is missing.
One X-Assist available ? And another one missing ? No problem : let's reverse engineer the first one and DIY the second one

The X-Assist features two PCBs : one for connection interfacing and pad, and another one for LCD, as pictured below.

X-Assist pad/interfacing board

X-Assist LCD board

The LCD board is incredibly complex, but since it was manufactured as a whole and can still be purchased on auctions or second-hand market nowadays, there's no real interest to build it from scratch ! And I personally wouldn't try : that seems too much complex

So remaining is pad and interfacing board : fortunately it uses standard components and not any Gate Array Logic-ish components that would need to be reverse-engineered too. Simply speaking, it's like assembling LEGOs
Multi-meter, a LCD board, electronic breadboard, a bunch of wires, few electronic components ... is there something missing ? Yes ! A LOT of motivation !!


X-Assist DIY prototype, in all its glory


It's so beautiful it deserves another picture !

Let's try for real ! Of course, after verifying any eventual short-circuit with a multi-meter 
No short-circuit ? It's then ready for the "first-lighting ceremony" (火入れ式), as it is nicknamed in my neighboring ... I don't know if that's a common expression in Japan or anywhere else, but I like its naming anyway


No sparks ? No smoke ? That looks good

At first glance, that seems working ! Let's try cheat codes search feature in order to be 100% sure ...

Search unit not found ?!

Arg, it was too early to sing victory X-Assist seems not being correctly detected by X-Terminator cartridge ...
Since text could be sent to the LCD, let's assume nearly everything is working correctly, and that a small detail is causing this trouble ... after some head-scratching, XRider found what's wrong : a Zener diode that initially looked useless was used to return some ACK to X-Terminator cartridge when looking for its connection !


The X-Assist screen after adding the Zener diode :
code search memory could be captured !


65535 candidate codes ?! I'm not sure if correct cheat code could be found this time, but at least the DIY X-Assist unit works correctly now

 

Additional informations are available in French  on Darius forums :


Credits :
 - XRider, for the good work in game cartridges preservation
 - Darius, for gathering French community around Saturn

Read more X-Terminator Cartridge Revival

Cheat codes overlap check feature

Written by cafealpha 4 comments
"Overlap check" ... yeah, I know that I'm always terrible when finding a name for a new feature or a new project

So, as its name may suggest, this feature check for cheat codes that would not work correctly together, and automatically unselect some cheat(s) in order to get things working as expected.
One illustration would be level select cheat code : some games may have a list of cheats like "play level 2", "play level 3", "play level 4", and so on. (no, there is usually no cheat code to play level 1 )

Example with Sonic 3D blast cheat codes : it's no longer
possible to simultaneously enable several "Play xyz level" codes
thanks to this overlap check feature


When trying cheat codes for the first time, the reflex would be "enable them all !", and in that case this would lead to undefined behavior. In typical case, game just work fine and since cheat codes are executed in the order from their list, the last overlapping cheat takes priority.

But, some games are quite picky regarding execution time, so the faster cheat codes handler is executed, the better. In other words, the less codes enabled, the more chances game have to work correctly.
Here is one example in video with NiGHTs into dreams : first half of the video shows cheat codes causing graphic glitches, and second half show updated Pseudo Saturn Kai version fixing theses glitches :


 
NiGHTs into dreams : graphic glitches caused by
cheat codes slow handler.
Video available on youtube.
Left : slow cheat codes handler, causing missing quads on screen
Right : game as well as unlimited time cheat code working fine

Hrm, that's around half a year ago, and I'm still fixing things for the same main feature  Well, that's how software development works : fixing bugs, adding new bugs, and returning back to step zero. Maybe smart people can develop things faster, but ... I'm not smart, so the best solution is to continue the endless development iterations until getting something OK for release


Illustration of Pseudo Saturn Kai development
(From The Crimson Permanent Insurance movie)

So well, let's go back to original topic, and let's add that I also felt bad each time I was enabling two incompatible codes. "Play level 2" : enable, "Play level 3" : enable, start game ... what will it do ? Maybe a thermonuclear meltdown because of some divide by zero error  ?! Well, it actually plays level 3, but that's unpleasant anyway.
I implemented cheat codes features from (basically) scratch first for fun (yes, I like 6+ months span software development projects ! ), but also for the freedom of making what I want. Especially, making cheat codes as user-friendly as possible ! So that this "overlap check" feature was added

Here is another example with cheat codes for Virtua Fighter Kids : this is an interesting example because some cheat codes for this game are using "enable code" (starting with `D') : this kind of code is sometimes used to prevent from executing other codes, typically when game module to cheat is not yet loaded, and that writing something to its location would make the game not working correctly.
As a consequence, "enable code" have a global effect on all enabled cheats, hence multiple "enable code" can't be enabled simultaneously.

Virtua Fighter kids uses "enable code" for a slightly different purpose : setting player health to a given value (50% of maximum, one HP, etc) only when it is set to maximum, ie on fight start time. By using this trick, game can then decrease health value, allowing to set some handicap to a given player.
This behavior is completely different in comparison to "unlimited health" cheat that always forces health value to maximum

Virtua Fighter Kids cheat codes list : "50% healt" and
"1-Hit Death" codes are the ones using enable codes


And, Virtua Fighter Kids is a good example, because it uses "enable code" at two different locations : at player 1 health value (06045974) and player 2 health value (06046A74). As only one "enable code" can be used, it's for example not possible to enable "1-hit death" code for both players.


Left : 1-Hit Death code enabled for P1
Right : P1 1-Hit Death code automatically disabled after
1-Hit Death code for P2 is enabled

Additionally, unlimited health for P2 is also automatically disabled, which is normal because it is in contradiction with 1-hit death code for it. From cheat code point of view, theses two codes write to same address, which doesn't makes sense.

"Hey, but I like "One Punch Man" series, and really want to enable theses two 1-hit death codes when playing Virtua Fighter Kids !" would you say ?
Well, that's not possible as-is, but adding a new cheat code setting both players health to 1 when health of any player is set to max value should do the job ♪
I didn't verified this code for real (in fact, I thought about it when writing this article), but it should be OK : "trust me, I'm an engineer"

1-Hit Death code for both P1 and P2
This could also be named "Two gentlemen duel"




I would like to finish this article with the introduction of a bug I fixed recently : I usually don't spend time in speaking about bugs I fix, because this would take too much time But the behavior of this one is very unexpected :

Text display is suddenly uncentered !?
Never though though such goofy bug
would be possible


So, this bug is triggered when selecting item in menu with scrolling text, and when text starts to scroll. The two features in relation with this bug (text centering and scrolling) are apparently unrelated, but the menu module used by Pseudo Saturn Kai is so spaghetti-ish that theses two features can collide into a bug

I'm honestly proud of this menu module It was initially designed for simple menu without even vertical scrolling, but evolved little by little in order to support each new features added to Pseudo Saturn Kai.
It's a complete spaghetti monster, but it works ! Yes, it works : trust me, I'm an engineer !

Read more Cheat codes overlap check feature

CRC merge done !

Written by cafealpha 4 comments
Among the boring tasks remaining in Pseudo Saturn Kai development, there was "IP header CRCs merge to cheat codes list" task remaining ...
... There was, because I finally finished to merge the CRCs I could gather here !
Well, I think there are still 20-30% of the games in cheat codes list still not associated with any CRC, but anyway that's a fair amount of work done so far



Last CRC merged, at the end of cheat codes list
Left text file : list of IP headers and their CRCs for each games I have here
Right text file : Pseudo Saturn Kai cheat codes list


What is that CRC thing ? That's a value I use in order to identify each Saturn games. Thanks to such CRC value, it's possible to easily associate each cheat codes to a given game, and consequently automatically select game in cheat codes list according to CD-ROM inserted in Saturn CD lid.
You don't like to manually select a game from cheat codes "select game" menu ? Me too So that I added this "automagically select game" thing in Pseudo Saturn Kai cheat code feature


By the way, it's probably a bit late for a surprise effect, but I'm glad to to announce that cheat codes feature will be available in Pseudo Saturn Kai next release

Basically, cheat codes handler now works ... for a majority of games tested so far. And user interface regarding cheat codes stuff is more or less okay ... but still needs to be perfected here and there.

So as you guessed, there are still details to complete until considering Pseudo Saturn Kai cheat codes feature ready for public release, and unfortunately polishing details usually (always) require time in software development, so let's hope next release will be available in a near future, which is "this year" in my own time scale regarding Saturn projects


Nights into dream cheat codes working !
That's the first game I used in order to test assembly version
of cheat codes handler


Having fun with cheat codes and USB connectivity on Radiant Silvergun
In-game memory contents are mine ! Ph34r my l33t h4Cklng sKI1lZ


So, the next development jobs are to support multiple CRCs per game : cheat codes list have several CRCs defined for some games (this is typically used for games using several CD-ROMs), but Pseudo Saturn Kai currently supports one CRC per game.
Modifying the cheats list → data conversion utility in order to support multiple CRCs will be also an occasion to add some extra verification stuff regarding CRC, such as verifying that two different games don't collide on the same CRC, which is something like around 2500 different CDs versus 4 billions possible CRCs ... hence should be OK, but who know what may happen when developing software


After that, it will be probably be the time to do some testing on as many games as possible, in order to verify that cheat code and game are correctly associated, and to verify that cheat codes are correctly working, etc.
Such task will require a significant manpower, hence to find a lot of beta testers. So if you're ready to give a hand, please stay tuned

Read more CRC merge done !

Pseudo Saturn Kai 6.074 released !

Written by cafealpha 2 comments
Pseudo Saturn Kai 6.074 released ... more than three months ago  Sorry for the late news, but that's still some quite acceptable delay in comparison to frequency I post articles in this blog

The release was initially announced on SegaXtreme forums, because it is my favorite forums for Saturn things (more than 11 years I registered to it !
Big thanks to the forum moderation/maintenance/support team for their steady good work ). Also the news was announced on SegaXtreme first ... because writing an article there takes less time than writing an article on my blog
So since I'm a lazy person, let's slightly arrange this article from what I wrote on SegaXtreme forums !


What's new in this version ? Well, there's basically, not a lot of major features (sorry !), but fix of a critical bug affecting Gamer's Cartridge, and addition of some "minor, but that I wanted to add someday" features.

______________
Features for Gamer's Cartridge users

Indirect Dump
: Dump cartridge (boot cartridge, or official memory cartridge, or any other cartridge) by compressing its contents to internal backup memory, and then extracting it to SD card when Gamer's Cartridge is inserted.
Because of small size of internal backup memory, it may be required to repeat the "insert memory cartridge → Indirect Dump → Turn off Saturn → Insert Gamer's Cartridge → Indirect Dump → Turn off Saturn" cycle several times, but at the end cartridge is dumped
Requires some motivation and free time on user side (It took me 45 minutes in order to dump my good old very first official memory cartridge), but this way of dumping doesn't requires to unsolder cartridge memory chips, which is the most important for me !
Note : if you are the lucky owner of Saturn FDD, then floppy disc is used instead of internal backup memory, and consequently dump is significantly faster and simpler.


Left : Screen display after compressing dump data
to internal backup memory
Right : Screen display after writing dump data from
internal backup memory to SD card
Theses pictures were taken on Indirect Dump's first successful test

One extra application of this feature was to dump ROMs from legacy cartridges such as X-Terminator, Satellite, ST Key and "8MEG memory cartridge". Curious people wanting to test theses cartridges theses ROMs can found them available for flashing (at your own risks) in Pseudo Saturn Kai Save Data Manager.
Special thanks to A Murder Of Crows, AtariBorn and SaturnGuru who dumped their cartridges ... and reported many bugs from early versions of Indirect Dump feature 

 
Indirect Dump development : the cut scenes
Left : dump data corruption (see below for details)
Right : Dump file CRC check error. Fortunately, only dump
computation routine was buggy, and dump feature itself was working


Save Data corruption bugfix : This corruption problem concerns saves on Saturn internal memory, with save data size making save sector allocation table finishing exactly at the end of a sector. Very few games are concerned, and the only example I could find so far is Albert Odyssey.

I found this problem when testing Indirect Dump : data compressed then written to internal save memory wasn't then correctly read and decompressed to SD card.
I initially thought this problem to be caused by Indirect Dump itself, because at the time I had this problem, I just finished to mess with data alignment error when preparing indirect dump's compressed data, so thought that this was the next bug to fix regarding Indirect Dump
Quick investigation showed that contents of read data wasn't as expected, with a small portion of data being same as data at unrelated offset ... so maybe a problem when compressing and adding header etc to Indirect Dump save data ? It took me then a around one hour of testing and code review until I was sure that culprit was actually not Indirect Dump itself, because re-read of save data didn't matched with written save data !
Then, testing Indirect Dump with same input data and virtual memory cartridge disabled worked as expected, which 99% confirmed that problem was located on virtual memory cartridge side !

So yes, "virtual memory cartridge" actually manages save data handling for all backup devices (internal save memory, memory cartridge, and even Saturn FDD too) : this is possible because Gamer's Cartridge hooks Saturn backup library at relatively high software level.
In comparison with 1:1 hardware emulation of save memory cartridge, this has the advantage of being free of capacity limitation inherent to memory cartridge's chips, and also allows to store save data individually on SD card (two files per save, vs big file containing all saves for 1:1 cartridge emulation). On the other side, all the save data handling software has to be re-written, so care has to be taken when re-implementing it

So, this is quite an uncomfortable bug I have to face : save data are corrupted when being written to internal save memory, and Gamer's Cartridge was released around 6 months before, with consequently cartridges potentially corrupting save data in the wild.
Fortunately, while being hard to find, the bug wasn't hard to fix  Basically, this was a timing error when updating current save data block ID, as described below :


Internal Save Data corruption related source code
Left : before fix
Right : after fix



Since I really didn't want to fix half of the bug (and having to fix the remaining half on other release), next step is to add a test bench tool for internal save data memory access !
"Test bench" is a program that automatically tests a lot of patterns for a given function or module. Ideally, all major modules should have their test bench, but in the real world, making test bench programs takes time, so programs are usually manually tested with 2 or 3 patterns, and then developer prays for all other patterns being bug-free 
... And to tell you the truth, this test bench was the largest one I wrote so far  It's not impossible a bug to be still hidden in an untested pattern, but anyway I'm quite confident about the reliability of internal save data support now 

Here is how test bench screen looks like on my dev environment :

SatLink and Yabause couple showing test bench screen.
SatLink and Yabause : my best friends when testing Saturn programs


Screen copy above was taken after fixing internal save data support, and I forgot to take a similar screen copy when bug wasn't yet fixed ... latest Save Data Manager CDROM's + Gamer's Cartridge with firmwave 6.037 should display error in test bench screen, so it would be funny to try it ... maybe someday 
BTW, Test Bench is still available in Save Data Manager CD-ROM (it took me a bit of time to add test bench screen, so didn't wanted to remove it after fixing internal save data corruption bug !), but this test bench screen requires a trick in order to be accessed : did you found it ?

That's all about internal save data corruption : I fixed it, and checked a lot of patterns about internal save data access, so similar problem shouldn't happen in the future !
Additionally, I didn't received any feedback from users about this bug, so let's hope it didn't corrupted game saves elsewhere than on my dev laptop



Autodump : Automatically dump saves from internal backup memory to SD card, so that they can be restored in the case they are lost because of depleted CR2032 battery, or save data manipulation error, etc.
With this feature, you won't have to say anymore "I lost all my saves because of that $%QTY@!#% CR2032 battery" 
Since this feature uses SD card, it is available on Gamer's Cartridge only. And no, I won't write save data into Action Replay's cartridge flash ROM : flash ROM chips are not designed in order to be written frequently, hence using flash ROM as read/write storage area may prematurely brick your Action Replay cartridge.
If you're not convinced about flash ROM limited write cycles, I can make some "cartridge self destruction" feature that would continuously write and erase random data to flash ROM, but don't claim that your cartridge no longer boots after that


An alternate solution in order to keep internal save data change the chip holding internal save memory to a FRAM one that doesn't requires battery to retain saves data, as detailed in db-electronics.ca.
(there are maybe other alternate solutions, so please let me know in the comments if I missed one)

The advantage of this FRAM mod is that saves are not lost when CR2032 battery is depleted. There are however several disadvantages :
 - This is an hardware mod, which requires to remove a chip, then solder another one, hence quite difficult to do.
 - CR2032 battery is still required in order to keep clock and language informations.

For being the developer of Pseudo Saturn Kai and Gamer's Cartridge, my opinion is a bit biased, but autodump is a better solution, because autodump is not an invasive mod (plug cartridge vs change chip on Saturn motherboard), and the FRAM solution doesn't allows to dump save data to modern media device. Anyway, I don't force you to like my projects, so if you don't like autodump, then don't use it


Virtual Floppy Disk Drive. Simulate Saturn Floppy Disc Drive (FDD) behavior, with save data stored on SD card.
This feature Worked fine with Dezaemon 2, which can now handle 10 saves at once (5 saves from cartridge, and 5 other saves on FDD ), but I didn't tested for other games using FDD, so any feedback is welcome.
This is a feature available on Gamer's Cartridge only too. Thanks to this feature, floppy disk access is available without having to plug any floppy disk drive to Saturn 



______________
Features for Action Replay and Gamer's Cartridge users

Proper support of FDD in Save Data Manager : Save Data Manager now supports both two partitions of Saturn floppy discs for all common operations such as copy, move, delete, import, dump, etc.
Special thanks to Dezaemon DB for big assistance in beta testing


Backup devices informations from Save Data Manager :
First device is internal backup memory : the easiest to handle
Second device is backup memory cartridge,
unconnected (zero partitions detected) in this picture
Third device is FDD : two partitions, wrong unit ID returned,
and always set at third position in devices information
array, even when cartridge is not available.
Basically, FDD is a real trouble-maker when trying to handle backup devices



Save Data Manager development cut scenes : trying to format FDD
(format for both two partitions is displayed in a single picture)
Don't worry about the horrible display of error
messages : it's (finally) improved in version 6.074


Soft Reset Patch
: Change the "A+B+C+Start key combo" soft reset from "exit to multiplayer screen" to system reset. This idea is not from me, but from neuroacid (rmenu developer).


More saves to import from Save Data Manager
. The most noticeable addition is saves from Urawaza Dataro cartridge, containing quality saves for Japanese games. Special thanks to Madroms for dumping the cartridge, and providing me its dump file 


Other
: Fixed many bugs, and added other bugs ... the usual routine 


(Not a software feature, but) future users of Gamer's Cartridge may appreciate the couple of new labels, designed by beebaraka-sensei (twitter) for artwork itself and Dezaemon DB (twitter) for the final editing of the labels. Many thanks to them for the very good work !


Dezaemon-themed labels ... could you find out the odd label ?

The design on theses labels is themed on Dezaemon 2, and as you can see, the Dezaemon character on the game cover grew in the right way 
I personally do appreciate the white themed one





Before being asked "where are the cheat codes ?", please let me reply :)
Cheat codes support is still under development. Menu in order to select game and its cheat codes is 90% done, but the bit of code in order to apply codes is still TBD. I didn't touched this feature for around half a year mostly because of lack of free time, motivation, and being busy in developing other features. I plan to finish this for "next-next release" however.
Update three months after writing the explanation above : cheat codes on Pseudo Saturn Kai are working on few games !! 
There are many things remaining until reaching an "OK to release" state, but at least the cheat codes core feature seems to work, which is quite a relief for me :)

By the way, there's a trick cheat codes selection menu in Pseudo Saturn Kai 6.074 : did you found it ? It won't do anything else than showing games list and cheats for each games, so it's not worth spending more than 10 minutes in looking for the appropriates key(s) combo and timing however.


Yes, this release have (at least) two Easter eggs available Coincidence with release timing during Easter period ? I think not


Apart from cheat codes, there are many other things scheduled for future releases : I initially planned to release everything at once, but had to make this intermediary release in order to fix the save data corruption bug on Gamer's Cartridge, so stay tuned


PS : Special thanks to Stac for beta testing  All the features above wouldn't exist without his help !!!

Read more Pseudo Saturn Kai 6.074 released !

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