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Messages - davidstech

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1
Other dumps / Re: PCP 8728 788 in 1 (Unknown Generalplus/unSP chipset)
« on: August 06, 2019, 02:41:59 AM »
Haven't noticed any real similarities - that uses some kind of 
(non-NES) 65C02-based processor.  I suspect that might also be a GeneralPlus part though.

2
Famicom/NES / Re: Taikee 64 in 1 Plug and Play TV Game (Extremly Rare)
« on: August 04, 2019, 03:34:43 PM »
It's surprising there's so little about this, I remember this being all over the shops (under various different guises) one Christmas in the UK....

3
Interesting! The first debug screen looks like it is testing ROM address lines (A0..A25 would be address signals for a 512Mbit 8-bit or 1Gbit 16-bit ROM). I've definitely seen the second one before, in other VT02/03 plug-and-plays.

4
Other dumps / PCP 8728 788 in 1 (Unknown Generalplus/unSP chipset)
« on: August 04, 2019, 03:23:21 PM »
Found this dump I made a while ago, it's probably not going to be emulatable any time soon (there might be some kind of mask ROM BIOS too), it's from a 788 in 1 console similar to this. Looking inside the string "SPF2ALP" appears many times which is a hallmark of a Generalplus/Sunplus system (it's from their sound converter tool), and the code inside seems to be for their unSP arch. I think this is running off one of the newer Generalplus microcontrollers but I'm not certain.

You can find some intact WAV files (with metadata) inside, as a little curiosity.

Download

5
Famicom/NES / Re: Nice Code Mario Kart returns...
« on: August 04, 2019, 02:43:31 PM »
It might be a few months before I have equipment & stuff set back up to dump things. But if it's not dumped by someone else by then, then I'll have a go. Would be nice to see them dumped...

6
Famicom/NES dumps / VTxx Dumping Thread
« on: April 21, 2018, 01:58:58 PM »
I think that one might be something like a VT369, but I'm not sure

7
Famicom/NES / VTxx BIN to NES 2.0 Converter
« on: February 14, 2018, 05:56:50 PM »
What exactly are you trying to convert, is it succeeding? If so, what are you trying to run it on? If not, what error do you get?

8
Famicom/NES dumps / VTxx Dumping Thread
« on: February 08, 2018, 10:58:22 AM »
Unfortunately as far as I can tell MAME itself no longer supports Android versions before 5, and I don't think there's anything that can be done about this from my point of view.

9
Famicom/NES dumps / VTxx Dumping Thread
« on: February 08, 2018, 07:40:21 AM »
I think this is probably another Android version issue, maybe it's best if you wait ~3 weeks and try the next official build which will have all this stuff included.

What exactly is happening when you go to "Load Content", select one of the ROMs, select "Load Archive" and then if asked select the "MAME 0.194" core?

10
Famicom/NES dumps / VTxx Dumping Thread
« on: February 07, 2018, 06:45:34 PM »
You're not supposed to go to the URL, just enter it in RetroArch as the core update URL (because retroarch for Android will only download cores from a update URL, it doesn't let you manually install cores from a file). It should work other than the palette bug in some games.

11
Famicom/NES dumps / VTxx Dumping Thread
« on: February 07, 2018, 09:30:53 AM »
The ZDog is now working in MAME. It turned out I was generating scanline IRQs incorrectly during VBlank. Now SMB3 in multicarts also doesn't crash. I've also sorted out the 16x16 sprite mode so the graphics are better in the Hummer games.
I finally have MAME on Android RetroArch working, so you can now play VTxx games on the go!

To install, you will need to follow these instructions
https://bbs.nextthing.co/t/how-do-i-download-cores-for-retroarch/16423/2
But use the following url:
http://davidstech.net/cores/
Then install the MAME core in the "Core Updater".

This is very much experimental, the controls are a bit dodgy (the touch D-pad doesn't work, you have to use the touch "joystick" instead), but it works, and it should run at full speed on a mid to high end phone.


I also notice there is a bug in this build when switching from VT03 to legacy palette that needs fixing. Beware of this when trying this out, I'll fix it tomorrow.

12
Famicom/NES dumps / VTxx Dumping Thread
« on: February 07, 2018, 06:01:42 AM »
At the moment my best speculation for this chipset is VT33, which is an unknown new chipset from VRT (seen on the PCB of a NES clone I saw online, and one or two other places). But I'm hesitant to call it that without further investigation, I know there's been a few places in the past where guessed chipset names turned out to be wrong. I think calling it VT3x might be safe though?

@Y2K05 yeah it's odd, the 2561 is more advanced (albeit possibly older) hardware than the 2573 as far as I can tell. I don't think it's in any way impossible to emulate, and will probably be my next challenge, but it might take a while.

13
Famicom/NES dumps / VTxx Dumping Thread
« on: February 06, 2018, 07:13:27 PM »
No, more reverse engineering is needed for that one before it will work in anything. I think it is VT36x based and has various enhanced features - more banking modes, more palette nemory, more PPU modes and possibly a multiply/divide ALU.

14
Famicom/NES dumps / VTxx Dumping Thread
« on: February 06, 2018, 04:36:13 PM »
This is starting to make sense, I thought the colours didn't look wrong enough. That also explains why I wasn't seeing CGRAM DMA accesses, clearly they were being disabled also as part of this weird auto-detection for however MAME was emulating it.

15
Famicom/NES dumps / VTxx Dumping Thread
« on: February 06, 2018, 05:31:37 AM »
Yes, there's a MAME core for RetroArch (in fact several, from around 2010 to the latest 0.194). I just need to get it working with the VTxx stuff.

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