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Author Topic: Prizm goals -  (Read 4170 times) Bookmark and Share
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AngelFish
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« Reply #45 on: 13 April, 2011, 23:31:25 »
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DJ, the max Prizm clock speed was based on the processor core being the normal SH3 7705 core used in previous calcs. We have evidence to suggest that it's a SH4A 7780/7781 core, which can handle much higher clock speeds (200 MHz). It's really a matter of how high the frequency multiplier will go if that's indeed the case.
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DJ Omnimaga
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« Reply #46 on: 13 April, 2011, 23:33:50 »
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Really? I didn't know that. It would be nice if it could.

By the way is it confirmed that it's the same processor as in the FX-9860G?
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« Reply #47 on: 14 April, 2011, 06:56:18 »
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The current processor seems to have been developed exclusively for Casio and is most likely a SH4A without the fpu and many of the peripherals. Also the total amount of ram is 2 MB and for the most part is free. Archive totals as 32 MB, but the OS currently claims 16 MB of that. Because the OS is only 6 MB long, there is the possibility of expanding more archive space in the future. Based off what I have found we can only overclock the proc in software so far until we reach a limit. After that the pll 2 circuit will have to change values, which is set via hardware. My guess is that maybe the careful use of a pencil could change that multiplier.
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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)
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« Reply #48 on: 14 April, 2011, 12:09:03 »
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So, basically, what we have is a max of 200Mhz? And in the 84+SE the max is 15Mhz? Freaking fast!
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« Reply #49 on: 14 April, 2011, 17:24:09 »
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Quote from: Scout on 14 April, 2011, 12:09:03
So, basically, what we have is a max of 200Mhz? And in the 84+SE the max is 15Mhz? Freaking fast!
don't forget clock cycles. The average z80 instruction is about 7 cycles while most Super H instructions are only 1.
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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)
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« Reply #50 on: 14 April, 2011, 17:28:28 »
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The worst exception is division, because that can take something like 96 cycles to do.
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DJ Omnimaga
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« Reply #51 on: 18 April, 2011, 02:30:29 »
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Does this means that certain things might actually be slower than on a 84+?
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AngelFish
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« Reply #52 on: 18 April, 2011, 02:32:15 »
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It's probably faster than on the 84+, because the worst case is the 32 bit division I was referring to, which would be even slower with a z80. Also, the processor runs quite a bit faster than the 84+, so 96 cycles isn't as bad as it sounds.
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DJ Omnimaga
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« Reply #53 on: 18 April, 2011, 03:00:18 »
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Ah ok good to hear. I was worried that we got our hopes up too much for hardcore gaming X.x
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« Reply #54 on: 18 April, 2011, 06:22:46 »
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Quote from: Qwerty.55 on 14 April, 2011, 17:28:28
The worst exception is division, because that can take something like 96 cycles to do.
Well in that case you need to be careful. Of course speed optimizations can be done by rolling out the for loop. But even better is try to avoid division it in the first place. The best thing to do is bit shifts for the cases of when you are dividing by powers of 2. And the SH4 is just brilliant at bit shifts Grin
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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)
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« Reply #55 on: 08 October, 2011, 14:32:26 »
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Ey! What just axe for Prizm, there is Fx-9860GII too! :p
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« Reply #56 on: 11 October, 2011, 06:44:12 »
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Quote from: Eiyeron on 08 October, 2011, 14:32:26
Ey! What just axe for Prizm, there is Fx-9860GII too! :p
Well the problem is that most Casio developers are either Prizm or 9860g exclusive. Added to that is the difficulty of porting the compiler over as both calculators have extensive technical differences that would need to be addressed. I for one do not own a 9860g and have no intention of porting any axe like language to it as that is not my area of development.
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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)
Eiyeron
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« Reply #57 on: 12 October, 2011, 15:54:56 »
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So, do you have already tested some overclocking?
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DJ Omnimaga
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« Reply #58 on: 26 October, 2011, 10:32:41 »
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From what I remember, they could overclock the calc fine, but the problem is that when we do so, it gets reset, so it's pretty much useless until they figure out how to get around that.
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« Reply #59 on: 26 October, 2011, 12:29:47 »
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Do you know why accesong the vram is so slow? A friend tried to make his own PutDD, and that was very slow (about 25 fps with, and 33 wihtout)
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