Guess the unknown rf shield from a console or home computer

http://produto.mercadolivre.com.br/MLB-628349956-mega-drive-com-sonic-2-original-_JM

This example is at US$80.

Edit: this one is what you want

http://produto.mercadolivre.com.br/...e-4-2-controles-guitarra-av-110v-100-jogo-_JM

Goes for about $55

 

Wow the first one really looks like a Genesis. If it wasn't for the fact it says Mega Drive in the corner, with a 32X you could make me believe it was a Genesis. If I had the money, I would get it.

That other one doesn't appear to have RGB out on it or even a cartridge slot. Are those actual hardware, hardware clones, emulation, or other voodoo?

 

I mentioned that the console with the plastic guitars didn't come with cartridges. Now you know why I said that.

I am not 100% sure if it's emulation or not. It might be the MD in a chip.

 

I was thinking it might be a MD in a chip. Maybe it could be modded for stereo and RGB.

 

PAL60 or PAL-M should get a stable black and white image on older NTSC TVs.
I don't know about HDTV compatibility.

Arcade monitors especially in the 80s and 90s used RGB. But games may have non-standard resolutions and refresh rates.
Some are within the tolerances of average TVs, and won't be too much trouble.

The simplest superguns are thus RGB SCART only. At times lacking even controller ports, which certain Neo Geo boards already have.
http://foromarciano.org/foro/images/76/22/346d6964ee9b2dd348c4e26310e9.jpg

 

Ah ok. When I get those Mega Drives, I'll try them out and see what happens.

I just did the 240p over component test with my Genesis using the composite cable plugged in the green jack and two rca cables plugged into the TV's red and blue jacks (unconnected on the other side). It says "Mode Not Supported" when using the Genesis.

I then plugged in the composite cable from the PS1 into the green jack and it displayed the image in black and white, like normal. The TV says it is 720x240p on the PS1.

Isn't the Genesis 320x240p? If so, then my HDTV doesn't support 320x240p over Component but supports 720x240p. I swore I did the test with the Genesis before though.

 

I'm not sure. It has to be part of the trick that enabled deviating from TV standards. After all, we're talking about technology with its early roots before 1940.
Even 480p systems like Wii are still labeled as supposedly "720" wide by XRGB Mini.

 

I wonder if the Wii actually outputs at 720x480p when the widescreen 16:9 setting is selected in the Wii system settings and 640x480p when the standard 4:3 is selected. I don't have my component cable atm so I can't test it out.

 

I have a pal snes which I modded with a supercic and also component modded it.

The cool thing is that running it via component on my sd sony trinitron crt I get full color when it's in PAL60 mode,in 50hz the screen just scrolls but in color.
On my friends sd sony trinitron crt my pal snes works but his actually supports 50hz mode in color over component.

 

How about these ? Probably PS2 slim or fat. Not sure...

 

Shield on the right: GH-006/GH-007 PS2. Attaches to the middle part of the casing with a small circuit board which has the battery and some of the console main board power circuitry.

Shield on the left: GH-004/GH-005 PS2. Attaches to top of the motherboard stack assembly. covers a board which has similar function as the one I mentioned on the line above.

 

So I just uploaded a video of what is happening with my Genesis in 50Hz mode. Can anyone also shed light on that error? I've never seen it before or even heard of it. https://www.youtube.com/watch?v=NT5HQnVDVLs

 

I already said the hardware used to generate PAL color is not present in a Genesis. Completely, literally incapable.

A color fix means replacing components on the board.

 

On NTSC mode the main frequency (53Mhz oscillator on the Mega Drive board) is divided by 15 to generate the color carrier for the color encoder. On PAL mode it's divided by 12.

Because your unit is NTSC, when set to PAL, the frequency will be wrong for the color encoder and the TV will receive no color information.

That's also what is confusing your upscale thing.

NTSC main frequency is 53.693Mhz (3.579545 x 15)
PAL main frequency is 53.203Mhz (4.433618 x12)

Edit: About the error, it's just that you jammed the table and the cartridge might be dirty. That caused a exception which the game debugger caught. SONIC1 is one of the very few Mega Drive games which actually halt and print an exception when a fault happen.

 

I thought I mentioned that it was a separate mod in the video. I'm going to have to watch it again and put an annotation in it.

Ah ok. I always have problems with Sonic 1. I will have to clean it. The person I bought it from cleaned it with rubbing alcohol. I think it is the 32X that needs cleaning because there are issues that sometimes happen with other games too. Never knew that about Mega Drive games though.

 

Advanced exception handling is a native feature of the 68000 CPU. It even has kernel mode (Supervisor mode).

One of the errors you can get from SONIC is "PRIVILEGE VIOLATION" which means a supervisor mode instruction was executed while on user mode.

That obviously is not supposed to happen on a Mega Drive because it should always run on supervisor mode.

It's impossible to tell what kind of error poor contacts on the cartridge slot may cause.

 

I wonder if it is possible to turn the Mega Drive/Genesis into a 68000 computer if you could access the other modes. I've never had experience with 68000 computers before so I don't know much about them. I've only had experience with MS-DOS, Windows 3.1/95/98 FE/XP/7/8/8.1, and limited use with Mac OS computers.

 

The only things the Mega Drive would need to be a computer are:

Writable mass storage
Operating System
User interface (keyboard, for example)

That being said, any Video Game machine could be a computer with these added.

 

Some consoles already are computers *cough* Original Xbox, PS2, and PS3 *cough*. Wow that was a nasty cough. lol

 

Many of us former X-banders tried to recreate the service, but it's been impossible. The engineers at Catapult reverse engineered/hacked each game that was playable on the system. Each time the modem connected to the central server for a match, it downloaded the patch that was created for that game on each modem. These patches are all gone. :-(

Selgus has more information on this in this old post:

https://www.assemblergames.com/foru...-for-the-Genesis-(Value-)&p=332390#post332390