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Messages - davidstech

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31
Famicom/NES dumps / VTxx Dumping Thread
« on: February 04, 2018, 12:12:37 PM »
Yes, quite possible, it was almost certainly dumped with some kind of custom jig rather than a proper programmer+socket. IIRC some of TeamEurope's bad dumps that I found were this type of chip too.
BTW I'm seeing whether the Android build script for MAME still works, although I'm not sure what the performance of the VTxx stuff will be like.

32
Famicom/NES dumps / VTxx Dumping Thread
« on: February 04, 2018, 12:06:36 PM »
It uses one of these little COB ROM boards like this. IMO they're a pain to dump because they are hard to desolder with hot air without desoldering the small BGA ROM chip on them (which itself is even more of a pain to dump), and they're not so standard so my programmer doesn't support them nor do I have a proper socket for them. I'm working on a jig that uses pogo pins (little spiky pins) to read them out without needing to desolder them, but time is limited. This type is used sometimes in cheap stuff, I think it's a cheap way of using flash chips recycled or surplus from old mobile phones (at least once the chip was a combined SDRAM+flash chip, where the SDRAM wasn't used at all, but a popular chip previously used in phones).



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33
Famicom/NES dumps / VTxx Dumping Thread
« on: February 04, 2018, 11:58:11 AM »
@Y2K05 whenever rebuilds the latest MAME for Android is the realistic answer

Video of the console here: https://www.youtube.com/watch?v=lFiXbRueBa4. TBH it's quite hard to compare the tiny crappy speaker in the DreamGEAR with the sound from my nice computer speakers, but the emulator is definitely doing well. Sadly the ROM chip in the console is a type that's a massive pain to dump so I'll probably leave trying to dump it for now.

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Famicom/NES dumps / VTxx Dumping Thread
« on: February 04, 2018, 11:34:30 AM »
Brilliant, thanks for your work on this! My console has arrived now so I'll record the sound for you.

35
Famicom/NES dumps / VTxx Dumping Thread
« on: February 03, 2018, 05:33:27 PM »
No idea what caused the bad dump, but it seems like a small part of the ROM at the beginning got totally corrupted.

The 288-in-1 menu looks small because the actual console switches from scaling down to native LCD resolution mode for the menu, but this isn't implemented yet.

36
Famicom/NES dumps / VTxx Dumping Thread
« on: February 03, 2018, 05:28:32 PM »
Yes, the sound still needs work on the DGUN-2573. The menu images are glitched because it is almost certainly a bad dump. I have one on order to investigate myself, I will post an update if I get a good dump.

Thanks for the heads up about the header format NewRisingSun2.

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Famicom/NES dumps / VTxx Dumping Thread
« on: February 03, 2018, 04:33:21 PM »
Thanks, that's fixed it :) - in MAME I actually enable the PRG RAM for all VTxx systems, so I forgot about it in the NES header. The only thing missing from the posted build AFAICS is the DIP switch setting for the FC Pocket 472-in-1 console/128-in-1 cartridge selection.

Download link for the VTxx pack below, including the 200 in 1 TV Games, Family Pocket, FC Pocket, and DGUN-2573 in NES format as well as the SY-888, SY-889 and CoolBoy RS-18 in BIN format (because those three don't seem to have a mapper yet.

http://davidstech.net/games/multis/VTxx%20New%20Dumps%20Pack%202018-02-03.7z

All of these should run in Nintendulator, let me know if there are any more header or dump issues.

Credit to persons unknown for the DGUN-2573 and TeamEurope for the RS-18 dump.

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Famicom/NES dumps / VTxx Dumping Thread
« on: February 03, 2018, 03:50:51 PM »
I am working on putting a pack of these dumps together for the latest version of NRS-Nintendulator. However, I can't get either FC Pocket or the DGUN-2573 ROMs working. The FC Pocket loads the title screen and Chinese menu fine, but the English menu gives only a blue screen. The DGUN-2573 just gives a dark green screen. I am using mapper 296, submapper 0, is there anything else I should have in the ROM header?

39
Famicom/NES dumps / VTxx Dumping Thread
« on: February 03, 2018, 01:53:35 PM »
I think this is starting to make sense. The SY-88x, M320, the DGUN-2561 and the Lexibook Cyber Arcade are probably all the same chipset, which I imagine is something like the VT368/VT369. That would explain the SY-88x using VT168-style RGB555 colour palette data, as it's some hybrid between the VT168 and the VT32/older NES-based parts, which unlike the VT168 also has backwards compatibility.

I notice MOGIS sell a console, the M200, which has enhanced games that look much more like VT168 (there's a video of it on Taobao here as well as NES games. This is probably also the same chipset, I have ordered one to dump.

If MOGIS are associated with Wellminds, who have various similar systems on their website, their list of platforms are "VT02、VT03、VT168、VT32、VT368、VT369、SPG220、SPG243、SPG288、GPL16218、GPL16258、ST2302、EM78P153". Obviously this is something VT, whilst it could be the VT32 I think the VT368 or VT369 is most likely.
They also mention WS109 series encryption ICs. One of the games lists for the M200 had "WS107" in the name of one of the games, which does make me fear these new consoles have some kind of authentication/encryption chip which will make emulation harder (but probably not impossible with some creativity...)

40
Famicom/NES dumps / VTxx Dumping Thread
« on: February 03, 2018, 01:25:53 PM »
I've started looking at the DGUN-2561 to see whether there is any hope of emulating it. I'm starting to think it's some kind of more enhanced part i.e. the VT368 or VT369. It seems to be making accesses to addresses in VRAM that wouldn't make sense for a simpler VTxx part (e.g. $3c00-$3eff). It also looks like it might have a VT168-style ALU at 0x413x (it's at 0x213x on the VT168), but I'm not sure about that. I also see a few reads and rights to various addresses $484x, $488x and $4ffx, not sure what they would be a peripheral or whether it's just RAM at $4800 .. $4fff,

41
Famicom/NES dumps / VTxx Dumping Thread
« on: February 03, 2018, 09:34:50 AM »
For some reason I'm not seeing CGRAM DMA at all in most of the games in MAME. I'm curious, what is $4014 returning when read?

42
Famicom/NES dumps / VTxx Dumping Thread
« on: February 03, 2018, 06:55:29 AM »
Quite possible, it's not my dump so there's nothing I can do. I have ordered one on Amazon Prime to have a look at tomorrow though.

43
Famicom/NES dumps / VTxx Dumping Thread
« on: February 02, 2018, 07:25:14 PM »
NewRisingSun2
Feb 2 2018, 06:35:14 PM
Well, I'm going to call it a day. Here is my progress so far. Use mapper 270 for FC Pocket 638-in-1 (and the two split ROMs), mapper 296 for DGUN-2573 and FC Pocket 472-in-1 (has the extra 128 game cartridge been posted?). I have not made any progress on 246 in 1 MOGIS M320 (VTxx) unfortunately.[/quote]Awesome thanks for your work! The 128 in 1 cartridge ROM is not separate, nor can it easily be split. The ROM is combined and checks for the value of the IO port $412d on startup. If it equals 0x06 the 128 in 1 cartridge menu is shown, otherwise the 472 in 1 menu is shown. I use a dip switch to implement this in MAME.

44
Famicom/NES / VTxx BIN to NES 2.0 Converter
« on: February 02, 2018, 05:54:30 PM »
It should run fine on Windows with Python 3 installed. You will need to run it from the command line though (i.e python vtbin2nes.py file.bin)

45
Famicom/NES dumps / VTxx Dumping Thread
« on: February 02, 2018, 04:07:19 PM »
Yes. I'm pretty sure every chipset on that list is Famicom compatible, the only possible exception is the VT368/9. No idea about the numbering either.

Based on what I can see of the die of chipset of the M320 (I didn't manage to get it out cleanly, but I was able to get of a photo of enough of it), I'm pretty sure it's identical to the 555 chipset used in the SY-88x series.
Unfortunately the FC Pocket isn't working any more after dumping, so I can't check #61.
Update: UNROM and CHR RAM is working in my MAME now, I'll add MMC1 and CNROM later.

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