I don't have the answer, only a few things I can guess. I remember reading a while back that you can not copy/reproduce the playchoice 10 ppu. This had more to do with the RGB mod for the NES. For the life of me I can't find this site or fourm I read this in. Since then i've become intrested in all things Playchoice 10. Through this I've been reading up on Eprom EEprom, Mask Rom, differnces between Microprocessors and a number of other things.
By no means am I stating that I understood everything i've read. At no point do I claim to be right, in what i'm going to say. I might even be spewing information the average programmer considers common knowledge. Just want a discussion with those that know better then I, on this subject. Hopfully, this will help others on their way.
So beyond the fact that the PPU is an IC or defined as a Microcontroller/processor, its a Rom of some sort, Right? I'm assuming it would be a Mask rom or a OTP Rom. As I can only assume that they didn't want people going into it and messing with the program. However, that still doesn't tell us why we can't copy it.
To date there is only two thing i've read that would prevent someone from coping the information. First being, that some type of fuse on the chip can be blown. This allows the chip to function, but prevents access to all the data on the Rom. The fuse can be reset, however this is done by using UV light which would wipe the data.
The second is a encryption of the data on the chip itself.
My curiosity would be, does everything lay with the programming. Does the architecture of the chip itself play a role in the reason it can't be reproduced? If say the data was easily retrieved, is it possible for someone to reproduce the chip?
By no means am I stating that I understood everything i've read. At no point do I claim to be right, in what i'm going to say. I might even be spewing information the average programmer considers common knowledge. Just want a discussion with those that know better then I, on this subject. Hopfully, this will help others on their way.
So beyond the fact that the PPU is an IC or defined as a Microcontroller/processor, its a Rom of some sort, Right? I'm assuming it would be a Mask rom or a OTP Rom. As I can only assume that they didn't want people going into it and messing with the program. However, that still doesn't tell us why we can't copy it.
To date there is only two thing i've read that would prevent someone from coping the information. First being, that some type of fuse on the chip can be blown. This allows the chip to function, but prevents access to all the data on the Rom. The fuse can be reset, however this is done by using UV light which would wipe the data.
The second is a encryption of the data on the chip itself.
My curiosity would be, does everything lay with the programming. Does the architecture of the chip itself play a role in the reason it can't be reproduced? If say the data was easily retrieved, is it possible for someone to reproduce the chip?
