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Author Topic: Casio Prizm documentation -  (Read 39741 times) Bookmark and Share
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z80man
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« Reply #195 on: 07 January, 2011, 04:13:31 »
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Quote
Dear cunstomer,

Thank you for sending e-mail.
Also we would appreciate for your interest in Casio new scientific calculators.
However we regret to say that Casio has no schedule for disclosing the details of file format and releasing Software Development Kit for Prism as for now.
Your understanding would be highly appreciated.

Best regards,
Well I thought it wouldn't hurt to send an email to Casio Japan asking if they could provide some help on the file formats, but they're not interested. I probaly send a reply to convince them to give up some information. Otherwise on the app format I have just one last part to figure out, the 16 bit checksum. Doing some further research it probaly uses an algorthim known as crc-16. The difficulty with this format is that if your just off by one byte you get a very different answer. I was going to write a C++ program to test every possibility, but it turns out it would take my computer about 20 years to calculate this  Frustrated Frustrated Frustrated
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List of stuff I need to do before September:
1. Finish the Emulator of the Casio Prizm (in active development)
2. Finish the the SH3 asm IDE/assembler/linker program (in active development)
3. Create a partial Java virtual machine  for the Prizm (not started)
4. Create Axe for the Prizm with an Axe legacy mode (in planning phase)
5. Develop a large set of C and asm libraries for the Prizm (some progress)
6. Create an emulator of the 83+ for the Prizm (not started)
7. Create a well polished game that showcases the ability of the Casio Prizm (not started)
AngelFish
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« Reply #196 on: 07 January, 2011, 04:21:01 »
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Wait, they're using a CRC check?

Mein gott, they really don't want us to be able to make these...

Anyway, this might help. It includes a method to reverse CRC-16.

http://www.woodmann.com/fravia/crctut1.htm
« Last Edit: 07 January, 2011, 04:23:20 by Qwerty.55 » Logged
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JosJuice
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« Reply #197 on: 07 January, 2011, 10:01:48 »
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Let's just hope they won't try to stop us once we've managed to run code.
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JosJuice
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« Reply #198 on: 07 January, 2011, 21:25:36 »
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Sorry for the double post...

There's something I've been wondering for a while. How does the OS sort add-ins?
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« Reply #199 on: 07 January, 2011, 21:35:04 »
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If I had to guess, it's in First in order. Whatever you put in last goes at the end of the list.
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« Reply #200 on: 07 January, 2011, 21:46:19 »
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So, if (for example) the Geometry app is deleted and then loaded into the calc again, it'll be at the end of the list?
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« Reply #201 on: 07 January, 2011, 21:48:46 »
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Possibly.
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« Reply #202 on: 07 January, 2011, 21:51:59 »
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I just realized... What if it's sorted by date? Conversion is the oldest add-in, and Geometry is the newest one. Newer ones show up earlier in the list...
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« Reply #203 on: 08 January, 2011, 21:38:41 »
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Here's some executable [machine] code for the Prizm:

Code: Select All | Copy To Clipboard

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1101100000000000
11111111111111111111111110000000
1001100100000000
0000000100010001
1101101000000000
11111111111111111111111010000110
1001101100000000
1010010101100101
1101110000000000
11111111111111111111111010000100
1001110100000000
0101101000000000
0010101010110010
0010110011010010
0010010010010010

If you translate into Hex:

Code: Select All | Copy To Clipboard

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2
3
4
5
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8
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10
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D800
FFFF FF80
9900
0111
DA00
FFFF FE86
9B00
A565
DC00
FFFF FE84
9D00
5A00
2AB2
2CD2
2492

This will set the processor to 58 MHz, wait ~4 Milliseconds, then restart the processor to complete the changes. I've also attached an add-in made from a modified version of the Geometry add-in. It just lacks the checksums. An add-in could also be written from scratch if anyone is willing to do it.
* App.txt (28.04 KB - downloaded 68 times.)
« Last Edit: 08 January, 2011, 21:39:34 by Qwerty.55 » Logged
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FinaleTI
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« Reply #204 on: 08 January, 2011, 21:45:31 »
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Does it run? Or does it require the checksum. I could maybe test it, but do I just need to change the file extension, or something more?
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So, yeah, I have a blog now. Nothing special, just your average ghost town.

Spoiler for Projects:
Spoiler for Pokemon TI:
Map engine is going to be redone from scratch, since I was lacking in organization last time. With a project as big as Pokemon, planning and organization is key, so that will probably be the brunt of the work done on this project for the time being.

Spoiler for Nostalgia:
Being worked on. Nothing really new to put here, but it's being worked on.

Spoiler for Finale's Super Insane Tunnel Pack of Doom:
I will be combining Blur and Collision Course into a single gamepack.

Spoiler for Nostalgia Origins: Sky's Story:
Currently on hold. I am unsure of whether this will remain DCS7 Hybrid BASIC or if it will use Batlib, Grammer or perhaps Axe.
This may see more progress once a demo of Nostalgia is released.
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« Reply #205 on: 08 January, 2011, 21:48:42 »
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Err, changing the file extension to .g3a would probably be a good idea. It *should* run, because I used Kucalc's method to disable the checksums, but I'm not sure. It will also reset your calculator, guaranteed.
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« Reply #206 on: 08 January, 2011, 22:01:59 »
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I just tried sending it to my calc, and it showed up in the memory menu, but not the main menu. I even reset my Add-In memory and tried it again.
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So, yeah, I have a blog now. Nothing special, just your average ghost town.

Spoiler for Projects:
Spoiler for Pokemon TI:
Map engine is going to be redone from scratch, since I was lacking in organization last time. With a project as big as Pokemon, planning and organization is key, so that will probably be the brunt of the work done on this project for the time being.

Spoiler for Nostalgia:
Being worked on. Nothing really new to put here, but it's being worked on.

Spoiler for Finale's Super Insane Tunnel Pack of Doom:
I will be combining Blur and Collision Course into a single gamepack.

Spoiler for Nostalgia Origins: Sky's Story:
Currently on hold. I am unsure of whether this will remain DCS7 Hybrid BASIC or if it will use Batlib, Grammer or perhaps Axe.
This may see more progress once a demo of Nostalgia is released.
AngelFish
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Last Login: Today at 00:41:29
Date Registered: 15 August, 2010, 09:18:54
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« Reply #207 on: 08 January, 2011, 22:03:48 »
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Hm, that's odd. What does the title look like in the memory menu?
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FinaleTI
Believe in the pony that believes in you!
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« Reply #208 on: 08 January, 2011, 22:08:17 »
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App.g3a is what is says in the memory menu.
It's recognized as an add-in, but it doesn't show up in the main menu, so I can't run it.
Logged




So, yeah, I have a blog now. Nothing special, just your average ghost town.

Spoiler for Projects:
Spoiler for Pokemon TI:
Map engine is going to be redone from scratch, since I was lacking in organization last time. With a project as big as Pokemon, planning and organization is key, so that will probably be the brunt of the work done on this project for the time being.

Spoiler for Nostalgia:
Being worked on. Nothing really new to put here, but it's being worked on.

Spoiler for Finale's Super Insane Tunnel Pack of Doom:
I will be combining Blur and Collision Course into a single gamepack.

Spoiler for Nostalgia Origins: Sky's Story:
Currently on hold. I am unsure of whether this will remain DCS7 Hybrid BASIC or if it will use Batlib, Grammer or perhaps Axe.
This may see more progress once a demo of Nostalgia is released.
AngelFish
This is my custom title
Administrator
LV12 Extreme Poster (Next: 5000)
*
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Gender: Male
Last Login: Today at 00:41:29
Date Registered: 15 August, 2010, 09:18:54
Posts: 3187


Topic starter
Total Post Ratings: +218

View Profile
« Reply #209 on: 08 January, 2011, 22:10:46 »
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Okay, that means that the memory menu reads from the VAT, while the main menu reads from the application header. I don't know why it won't run, though. Can you try this one (with Checksums enabled)?

You can delete add-ins, right?
* App.g3a (28.04 KB - downloaded 59 times.)
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