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Post by spannernick on Jun 30, 2020 17:06:48 GMT
I just found out the64 file Carousel was meant to show 255 games but it only shows about 226 games so I was wondering if anyone is willing to try a hack it to get it to display 300 games, PCU needs it. Looking ast the HxD at the53=4 file for the maxi at DD44 it does has FF so why is in not showing 255 games, only 226..? whats the next hex number..? You can do it with HxD - Freeware Hex Editor and Disk Editor I posted this here so it has its own post about it if you want more game in the Carousel. This is for theC64 Mini, the64 file... So if Change the 0x96 to FF: -> 255 games in the Carousel,what is the code for 300 games, you need to add another 96 bytes then so FF to ? About the max limit of 150 games in the carousel. In the the64 (v1.3.2) elf bin at offset 0xD9D0 you will find the value 0x96 (150).By looking at the code it looks like this is where the init code for the lib happens :0001D9D0 96 00 A0 E3 MOV R0, #150 <- This byte :0001D9D4 09 7D 00 EB BL malloc_game_lib If anyone would like to try to get more games then set this byte to like 0xC8 (200) and see if you can have more games. (this is the the64 file that is 238884 in size. I think it is for the US mini version?) (for the file with size 260240 (maxi?) it is the offset 0xDD44) This reminds me of the good old days, scanning memory on the C64 for special values. Where's PEEK and POKE for Linux?  In the 'the64' source there's in gamelibrary.h: #define GAME_META_TITLE_MAX 100
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typedef struct {
unsigned char title [GAME_META_TITLE_MAX + 1];
char filename [GAME_META_FILE_MAX + 1]; // room for path too
unsigned char description[LANG_MAX][GAME_META_DESCRIPTION_MAX + 1];
unsigned char author [MAX_AUTHOR][GAME_META_AUTHOR_MAX + 1];
unsigned char publisher [GAME_META_PUBLISHER_MAX + 1];
unsigned char music [GAME_META_MUSIC_MAX + 1];
unsigned char genre [GAME_META_GENRE_MAX + 1];
unsigned char year [GAME_META_YEAR_MAX + 1];
char cover_img [GAME_META_FILE_MAX + 1];
char screen_img [MAX_SCREEN_IMAGES][GAME_META_FILE_MAX + 1];
int author_count;
int screen_image_count;
int cartridge_title_id;
int needs_truedrive;
int needs_driveicon;
int vertical_shift; // Screen has top/bottom boarders chopped. This allows adjust.
int is_ntsc;
int is_64;
int is_basic;
sid_type_t sid_model;
joystick_map_t port_map [JOY_MAX_PORT][JE_MAX_MAP];
int port_primary;
unsigned int duration;
} game_t;
So if i understand correctly the struct's memory is reserved based on the compile-time constant GAME_META_TITLE_MAX (note this is from v1.2.0, since then increased to 150). Or is this memory only reserved at run-time? Edit: Amazingly enough this seems to work! I tried it on the Mini. - Change the 0x96 to 01: -> Segmentation Fault. Bad luck for the people who only want ONE game in the Carousel?
- Change the 0x96 to 95: -> 149 games in the Carousel
- Change the 0x96 to C8: -> 200 games in the Carousel
- Change the 0x96 to FF: -> 255 games in the Carousel
So great idea raxrip ! This patch would be a nice addition to your Carousel editor. Oh and GAME_META_TITLE_MAX 100 is the Title of the game, the name of it and how big the its name can be, 100=100 characters long, it the wrong place in the code for the game slots...  |
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Post by spannernick on Jun 30, 2020 17:44:58 GMT
So it works cool  I guess now it's time to find out if we can have even more.. 0xDD44: 00 02 00 E3 MOV R0, #512 So at the same offset set these bytes to see if 512 games is supported.. The original bytes are: 0xDD44: 96 00 A0 E3 MOV R0, #150 Change 3 bytes in total. Do you have to do this in a Hex Editor..? I use HxD on Windows and use Ex2 Volume Manager to see and edit the file system on THEC64 Maxi on the SD Card. Is it at 0000DD40 and column 04 its says 96 there,do I change 96 to C8..? The Offset(h) says DD44 on the bottom bar. Yes you change it to C8,in HxD you open the64 file and look for 0000DD40 and look in column 04 (you will see The Offset(h) DD44 on the bottom bar) then highlight 96,click on Edit>Fill selection and put C8 in Fill Pattern Pass Hex values box then press OK box. then save file. it should made a bak of the file after you save it.
If you have THEC64 Maxi you try it yourself but made a backup of your the64 file first.. Download it here.. View Attachment It should let you have 200 games in it now. the64 file is in usr\bin, use CFW for Mod(X-Windows LXDE) to copy it overHere is a Pic..  |
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Post by spannernick on Jun 30, 2020 20:59:11 GMT
0xDD44: 00 02 00 E3 MOV R0, #512
I did try this on the64 file for TheC64 Maxi and it didn't work, it stopped the Carousel booting up.
Anyone know what is 300 or what the next number would be in 8 bit binary is or is FF the last 8bit hexadecimal..?
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Post by kugelblitz on Jul 1, 2020 4:53:50 GMT
0xDD44: 00 02 00 E3 MOV R0, #512 I did try this on the64 file for TheC64 Maxi and it didn't work, it stopped the Carousel booting up. Anyone know what is 300 or what the next number would be in 8 bit binary is or is FF the last 8bit hexadecimal..? Also a tricky number because adding 1 to it can have strange consequences in your code, depending on how you do it. It also works the other way around, "substracting" 1 from hex 00 gives you ff, which would be 255. The most famous bug based on this is in the first Civilization game, which can make Ghandi from the most peaceful person into the one throwing atombombs on everything that moves. |
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Post by spannernick on Jul 1, 2020 12:25:54 GMT
0xDD44: 00 02 00 E3 MOV R0, #512 I did try this on the64 file for TheC64 Maxi and it didn't work, it stopped the Carousel booting up. Anyone know what is 300 or what the next number would be in 8 bit binary is or is FF the last 8bit hexadecimal..? Also a tricky number because adding 1 to it can have strange consequences in your code, depending on how you do it. It also works the other way around, "substracting" 1 from hex 00 gives you ff, which would be 255. The most famous bug based on this is in the first Civilization game, which can make Ghandi from the most peaceful person into the one throwing atombombs on everything that moves. I looked up binary yesterday, (I was crap a math at school, I hated it, got a 5 for it, that like a E now..  ) So FF(255) is the last 8 Bit then it goes to 9 bit, in one of raxrip posts he changed 3 bytes to make 512 but I test that and the Carousel don't boot up..? How does "00 02 00" make 512..? This is his post.. (This reminds me of the BBC Micro Model B and Acorn Electron,I still have my Electron in the Bedroom.. , When you would load a from Tape it would load it in bytes so "00, 01, 02, 03...09, 0A, 0B, 0C, 0D, 0E, 0F, and so on..) |
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Post by jj0 on Jul 3, 2020 8:37:15 GMT
FF (255) is the last 8bit hex, like 99 is the last 2 digit number in decimal. Also a tricky number because adding 1 to it can have strange consequences in your code, depending on how you do it. It also works the other way around, "substracting" 1 from hex 00 gives you ff, which would be 255. The most famous bug based on this is in the first Civilization game, which can make Ghandi from the most peaceful person into the one throwing atombombs on everything that moves. I looked up binary yesterday, (I was crap a math at school, I hated it, got a 5 for it, that like a E now.. ) So FF(255) is the last 8 Bit then it goes to 9 bit, in one of raxrip posts he changed 3 bytes to make 512 but I test that and the Carousel don't boot up..? How does "00 02 00" make 512..? This is his post.. (This reminds me of the BBC Micro Model B and Acorn Electron,I still have my Electron in the Bedroom.. , When you would load a from Tape it would load it in bytes so "00, 01, 02, 03...09, 0A, 0B, 0C, 0D, 0E, 0F, and so on..) You need to understand that for the Mini/Maxi: - Data is stored in memory before the instruction: In 96 00 A0 E3 the 'A0 E3' is the instruction to store data '96 00' in register R0
- Data is stored in memory in 'Little Endian' order so 96 00 means 0x0096 = 0 * 256 + 9*16 + 6 = 150 decimal
- 300 decimal = 0x012C so in Little Endian that would be 2C 01 so the instruction in the64 would be '2C 01 A0 E3'
Having said all that, I tested both 300 '2C 01 A0 E3' and 256 '00 01 A0 E3' on the Mini, both crashed with Segmentation fault. |
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Post by spannernick on May 26, 2021 14:37:27 GMT
In all the different binary files(Arget,Amora,Ares) the code to change how many games slots(from 150 to 255) stays the same, It just moves cause more code has been added, RGL can never change it unless they change the code and redesign it, it will never change cause of the way its been compiled, it like a fingerprint, if you look at the binary code and then the decoded text the text always has in it the characters "Oye" just before the 96 Hexadecimal so like a fingerprint thats always there at the beginning of the code and in every the64 file has that fingerprint so its so easy to find every time, look at the pictures of Argentv1.3.2, v1.5.2 and Aroma v1.3.2 and you will see, I am very good at seeing patterns in things, well I am Autistic... , I see things my wife does not.. it can be odd sometimes.. Look below.. Can you see what I see...? Oye text is always the same  Argent v1.3.2 - with 255 Game Slots, original bytes D5 FF EB 96 00 A0 EB Changed to D5 FF EB FF 00 A0 EB  Argent v1.5.2 - with 150 Game Slots(before I changed it) original bytes D3 FF EB 96 00 A0 EB Changed to D3 FF EB FF 00 A0 EB  Where the byte says D5 it can be D3 too cause the code has changed a bit. Attachments:
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Post by spannernick on May 26, 2021 14:41:57 GMT
Aroma v1.3.2 with 255 Game Slots  So can you see the pattern... ?... (I feel like I am watching Fringe, The Pattern of Fringe Events Walter Bishop, Peter Bishop, Olivier Dunham, liked that series) It changes when you change the 96 to FF(255) games in the Carousel) so from Oye-. a to Oyey. a but Oye is always the same so easy to look for and spot. Amora carousel 1.5.2 is at offset E80D, original bytes D2 FF EB 96 00 A0 E3 Changed to D2 FF EB FF 00 A0 E3 Ares carousel 1.5.2 is at offset E40D, original bytes D3 FF EB 96 00 A0 EB Changed to D3 FF EB FF 00 A0 EB Attachments:
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Post by spannernick on May 28, 2021 15:31:19 GMT
I looked up binary yesterday, (I was crap a math at school, I hated it, got a 5 for it, that like a E now.. ) So FF(255) is the last 8 Bit then it goes to 9 bit, in one of raxrip posts he changed 3 bytes to make 512 but I test that and the Carousel don't boot up..? How does "00 02 00" make 512..? This is his post.. (This reminds me of the BBC Micro Model B and Acorn Electron,I still have my Electron in the Bedroom.. , When you would load a from Tape it would load it in bytes so "00, 01, 02, 03...09, 0A, 0B, 0C, 0D, 0E, 0F, and so on..) You need to understand that for the Mini/Maxi: - Data is stored in memory before the instruction: In 96 00 A0 E3 the 'A0 E3' is the instruction to store data '96 00' in register R0
- Data is stored in memory in 'Little Endian' order so 96 00 means 0x0096 = 0 * 256 + 9*16 + 6 = 150 decimal
- 300 decimal = 0x012C so in Little Endian that would be 2C 01 so the instruction in the64 would be '2C 01 A0 E3'
Having said all that, I tested both 300 '2C 01 A0 E3' and 256 '00 01 A0 E3' on the Mini, both crashed with Segmentation fault. It must change something in the Carousel when its at 300 games cause I can't seem to find the Hex code in 1.0.5, I even looked for 2C 01 A0 E3 and it couldn't find it, maybe the hex code for the game slots is mixed with VICE emulator code. |
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Post by c64stuff on May 28, 2021 16:15:26 GMT
Just curious, is there any chance of the carousel being able to show preview videos of games? The two biggest features I like about Retropie are preview videos and attract mode.
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Post by spannernick on May 31, 2021 10:23:15 GMT
No, RGL would have to added that, but the A20/H3 SoC would not be able to handle it anyway, the H3 acts the same as the A20, it only uses 2 cores when its a quad core, has 4 cores.
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About the max limit of 150 games in the carousel.
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Your BOB is great!