Make a VT game work on nes

[Ben Boldt]

It probably isn't so simple of an answer to change a few bits and expect VTx game to run on NES. The honest answer is, NEITHER of us know how to do it. You have to think about it from our perspective too, not just from your own. To us, you are asking us to do a lot of work for you, to figure out how to convert or rewrite a VTx game into a normal NES game. And the reason you are asking us to do this is because you don't want to have to figure it out yourself, or you gave up or got lazy. We can see your intentions clearly and it doesn't motivate us to volunteer to help you. Rest assured, if we gave you some starting point code, instead of using that to learn and make your own contribution, you would come directly back with a list of additional changes that you want added. And we don't want to sign up for that kind of support. We do that kind of thing at work and make big bucks for it. That obligation is not for free for you to have. I am not trying to be mean to you, this is the way the real world works and it is fair when you understand to see things from other people's perspective. Always ask yourself, what if someone did this to me. There's 2 test for most correct decisions in life:

What if someone did this to me?
What if this is on the front page of the newspaper?

[kelvin donna]

It probably isn't so simple of an answer to change a few bits and expect VTx game to run on NES. The honest answer is, NEITHER of us know how to do it. You have to think about it from our perspective too, not just from your own. To us, you are asking us to do a lot of work for you, to figure out how to convert or rewrite a VTx game into a normal NES game. And the reason you are asking us to do this is because you don't want to have to figure it out yourself, or you gave up or got lazy. We can see your intentions clearly and it doesn't motivate us to volunteer to help you. Rest assured, if we gave you some starting point code, instead of using that to learn and make your own contribution, you would come directly back with a list of additional changes that you want added. And we don't want to sign up for that kind of support. We do that kind of thing at work and make big bucks for it. That obligation is not for free for you to have. I am not trying to be mean to you, this is the way the real world works and it is fair when you understand to see things from other people's perspective. Always ask yourself, what if someone did this to me. There's 2 test for most correct decisions in life:

What if someone did this to me?
What if this is on the front page of the newspaper?

i know someone, who does know this: Newrisingsun
I don't have enough knowledge and because someone else has better knowledge, i have my rights for asking.

[Ben Boldt]

I am just trying to help you in the most useful way kelvin donna. I am not being mean or incorrect, it is only to help you. You reach out to us for help, and I provide the help you actually need. You should think about what I said carefully and not dismiss it. This is all that you get for now. I won't beat a dead horse.

[kelvin donna]

I am just trying to help you in the most useful way kelvin donna. I am not being mean or incorrect, it is only to help you. You reach out to us for help, and I provide the help you actually need. You should think about what I said carefully and not dismiss it. This is all that you get for now. I won't beat a dead horse.

This isn't helping me out but thank you for your understanding

[aquasnake]

The one bus enhanced Famiclone of VR tech, is not fully compatible with NES. It has additional hardware (such as enhanced color palette, enhanced audio, built-in mmc3 mapper), and fixed 2KB ciram, which is always selected.

This kind of hardware is no longer defined as a mapper of nes2.0. But if we ignore the special hardware and force to define it, it has also been assigned to maper256

Mapper256 at this time does not represent vt2 / VT3 / vt168, but only refers to some ROMs or carts released by waixing net platform that can be executed on a real NES/FC

Code: Select all

						15'h2016: r1[2:0] = 0;
						15'h2017: r1[2:0] = 1;
						15'h2012: r1[2:0] = 2;
						15'h2013: r1[2:0] = 3;
						15'h2014: r1[2:0] = 4;
						15'h2015: r1[2:0] = 5;
						15'h4107: r1[2:0] = 6;
						15'h4108: r1[2:0] = 7;
						//15'h4109: prg_bank_c = cpu_data_in;
`ifdef MAPPER_256_WXN
						if (scrambled_reg)
							case (r1[2:0])
								3'b000: chr_bank_h = cpu_data_in;
								3'b001: chr_bank_g = cpu_data_in;
								3'b010: chr_bank_f = cpu_data_in;
								3'b011: chr_bank_e = cpu_data_in;
								3'b100: chr_bank_c = cpu_data_in;
								3'b101: chr_bank_a = cpu_data_in;
								3'b110: prg_bank_a = cpu_data_in;
								3'b111: prg_bank_b = cpu_data_in;
							endcase
						else
`endif
							case (r1[2:0])
								3'b000: chr_bank_a = cpu_data_in;
								3'b001: chr_bank_c = cpu_data_in;
								3'b010: chr_bank_e = cpu_data_in;
								3'b011: chr_bank_f = cpu_data_in;
								3'b100: chr_bank_g = cpu_data_in;
								3'b101: chr_bank_h = cpu_data_in;
								3'b110: prg_bank_a = cpu_data_in;
								3'b111: prg_bank_b = cpu_data_in;
							endcase

The above variants based on mmc3 can be supported.

[kelvin donna]

The one bus enhanced Famiclone of VR tech, is not fully compatible with NES. It has additional hardware (such as enhanced color palette, enhanced audio, built-in mmc3 mapper), and fixed 2KB ciram, which is always selected.

This kind of hardware is no longer defined as a mapper of nes2.0. But if we ignore the special hardware and force to define it, it has also been assigned to maper256

Mapper256 at this time does not represent vt2 / VT3 / vt168, but only refers to some ROMs or carts released by waixing net platform that can be executed on a real NES/FC

thank you for the explanation.
Because of the external Pallete and PCM, i configured a plenty of games to VT02:
https://mega.nz/file/Fpd0XTRC#ZH2gsXIQx ... 4peobpa-Uw
those have weakenend graphics and the PCM is cut off entirely.
so it would be enough to configure those games to work on FCEUX, since i configured the games VT02

[kelvin donna]

well, to get everything straight.
my mission for you is EITHER to inject the 256 NES 2.0 Mapper together with the Submappers (in the Attachments) to FCEUX, Pocketnes or HVCA ,

or...

configure the games' functions to work on lower mappers, especially since FCEUX only has a lower Mapper.


don't blame me for doing nothing. i Hacked the games to be VT02 Conform (link somewhere above). so it would be teamwork.

[kelvin donna]

http://www.ipyear.cn/copyright/detail_2007SR01138.html

Registration number: 2007SR01138
Name: 《WAVE TIGER--深海之虎》游戏软件 [Deep Sea Tiger - Game Software]
Copyright owner: 福州外星电脑科技有限公司 [Fuzhou Waixing Computer Technology Co. Ltd.]
Registration date: 2007-01-18
Publication date: 2006-09-25

too bad we have no idea, on what console that game version exists.

[kelvin donna]

or how about hacking the submapper, to be an battery for the nes rom?

[kelvin donna]

alright, now onto some info material:
i read a bit through this wiki entry about mapper 256:
https://wiki.nesdev.com/w/index.php/NES_2.0_Mapper_256
looking up the charts from "Bank register address and CPU opcode scrambling", i found out, that it is possible to change hex values of the mapper code, so it can work differently.

[kelvin donna]

and btw, cube tech's hack of international cricket by mitashi is truly VT02 with mapper 4, despite being vt369 with mapper 256

[kelvin donna]

UPDATE: Here is a version of the backgammon game once again.
but this time, i cut out the pcm audio for real.
now, in order to make the game work as standard famicom, some bytes of this game need to be changed.
help me out please.