EPROMs for 2600 4k - AM2732B on TL866II+ ?

[EPROMs for 2600 4k - AM2732B on TL866II+ ?]

What is the error you got???

I tried to program some AM2732B using my willem programmer and all works fine.

 

[Which EEPROM programmer to use?]

On 8/24/2020 at 8:50 PM, Shawn said:

 

Willem programmers are the bottom of the barrel but they do work for what they are. For only a couple bucks more you can get a TL866 as mentioned a couple times in this thread. The TL866 and any of it's variants\successors are far superior to those entry level Willem PCB only programmers. 

TL866II WILL NOT program 2732 chips and will NOT program 2716 chips commonly used for Atari 2600 (2k or 4k games). That programmer not reaches 21v (and above) vpp voltage required by this eproms.

Willem is better to do that in this case.

Willem do the job.

[8k games into a 4k CHIPS???? How is it possible??? (ATARI 2600)]

THE GAMES INSIDE THE ROMS I PLACED ABOVE IS:

E.T

Press Cooker
Robot Tank
Pigs in Space   (ALL BY RENTACON)

H.E.R.O. (By Rentacon)
Pole Position (By Rentacon)
Moon Patrol (By Rentacon)
Beam Raider (By JVP)

[8k games into a 4k CHIPS???? How is it possible??? (ATARI 2600)]

On 9/16/2020 at 6:40 PM, Pilot99 said:

 

Hello my friend, I need games with the same bankswitch of this cartridge, have you done a dump? know where I can find 8k games with the same bankswitch?

Sorry for the delay. Covid-19 time it is been a hard days and hard night here.
I dumped my two carts today an sent zip files here.

Please note that this is a weird strange cart.

It uses a kind of special 16K chip that fits a 32K data content.
So I did two types of reading. Firstly I did a read as a 27128 chip and after I did a read as 27256 chip. Please Keep in mind that the actual chip is a NMC27CP128Q. I sent attached all the data I got. I placed some pics from the board too.
Hope be useful for you.
Once more sorry for the delay on dumping the files...
 

READ AS 27C128.zipx READ AS 27C256.zipx

[Atari 2600 clone - Bit 7000 ?]

SORRY FOR REBIRTH AN OLD POST BUT I do Have a BIT 7000 console in its original Box with papers... It is an Atari 2600 clone with  a kind of nes style.

[Tem atarianos do Brasil aqui?]

On 4/15/2014 at 9:15 AM, Marcus Vinicius Garrett Chiado said:

Sou o autor dos livros "1983: O Ano dos Videogames no Brasil" e "1984: A Febre dos Videogames Continua".

 

Cara! Eu comprei teus livros!!! Foi a coisa mais deliciosa do mundo lê-los!!!!!! Tem mais alguma coisa??

[Atari paddle rotation]

I think the arrows are pointing clockwise.

When the lowest resistance is reached, full clockwise is also achieved.

But this is not a problem.

Testing is very easy.

If not, just invert the wire to the other contact of the potentiometer.

Remembering that the center (cursor) does not change.

[CD4050 A/V mod on PAL atari 2600]

On 10/23/2020 at 3:41 PM, alex_79 said:

I don't know for sure.

Since I used the cd4050 that was already installed on the board (this is only possible on 6 switch and junior models), I removed a few components to isolate the chip from the rest of the circuit on the Atari board.
But if you're building the full mod with an external cd4050 like shown in the FAQ, maybe the existing circuit won't interfere and you don't need to isolate it.

 

Sorry for the late reply, I didn't log in the forums in the past few days.

 

Thanks a lot friend. I did the 4050 mod and removed only the sound oscilator (transistor, inductor and the resistor that is the way to mix the signal to video). 
I build two ones. Used 74HC4050. The results was GREAT!!!! My consoles are NTSC versions. Tried a lot lot lot of simple av mod versions, (with 0, 1, 2 and 3 transistors) but all of then was terrible.
The only one that gave me  a CLEAN and PERFECT SCREEN with NO INTERFERENCES and NO NOISY PICTURES is even the 74HC4050 MOD

 

.

[Is ENIG good enough for card edge connectors?]

Hi friends, please..
Where do I find cartridges connector that fits perfect on a Vader´s atari 2600 console??
Thanks

[Strange scanline effect on composite modded 6Woody]

The UM6526P1 is indeed the PAL version of the TIA. ( I think is the same as CO11903) and both may have NO THE SAME pinouts than 6526N!!!!!!
UM6526N, KSC131 and CO10444D, are the NTSC version!!!
Please take a look below for more...

 

 

 

[Simple DIY composite video mod]

8 hours ago, Shawn said:

 

You might find different TV's give you different results depending on how they process the signal?

I did it. Tried on several TV devices, CRT and LED ones but the issues always was there.  On CRT TVs the issues was less than in Led TVs but still is there. On led TV the issues was too much!!! Using the 4050 mod at the same TVs devices as did before, all work perfect. All the pictures I posted here was taken using the same TV device. The issues pics and the solved pics are at the same screen device. 

[Simple DIY composite video mod]

On 10/13/2020 at 2:22 AM, ChildOfCv said:

Last update. 
Unfortunately I couldn't find the reasons why this simple mod doesn't work well on my console. The screen has a lot of interference and noise. I had to do the 4050 mod. It was the only way that worked well. A pity because it takes a lot of work to build, so I was interested in this simple mod.
Now the image is perfect, clean, clear and very beautiful! 74HC4050 is even better than the CD4050. Attached are some pictures of the amazing result.
Thanks to all friends who helped me here, especially to the friend @simon.plata who created this post.

P.S.--} I still plain to try FMS6400 version if I can get one. 

 

 

 

[Atari 2600 graphics problem]

1 hour ago, Sebastien said:

i found the problem it's the TIA CHIP, where can i found a new one ?

 

Here in Brazil it is expensive and hard to find. What is the country you live??? Maybe in your country could to be simple and cheap.. thru Internet 

[Atari 2600 graphics problem]

On 10/12/2020 at 1:49 PM, Sebastien said:

Hi,

I have a issue with my atari 2600. The problem is the image. I Don't know why and how but graphics are much darkers and différents since yesterday after playing galagon homebrew.

- No, the problem is not the tv, i try two diiferents tv and i have the same problem.

- I have the black vader Atari 2600 version

- i never seen the problem since i buy the atari ( 5 years ago)

- somebody already saw this problem ? how can i fix that ( i'm not a pro technician)

- Check the pics below to see the problem 

 

 

i'm desparate. thank to answer me

 

It seems to be a problem at TIA CHIP.

Is the TIA soldered to the board or does it use a socket?

If it is soldered, try resolding it and if it is in a socket, try a new socket and cleaning all the CHIP terminals before reinstalling it.

The CHIP may also be defective.

[Strange scanline effect on composite modded 6Woody]

On 10/19/2020 at 12:10 PM, jaguarwong said:

I had a 6 Switch Woody (PAL) with no RF output at all.

I generally don't agree with modding but in this case I considered fitting a Composite mod from The Future Was 8 Bit as more of a repair.

 

Unfortunately, while the mod is now giving me a picture, there is a strange problem where the scanlines are showing in alternating colours.

I've attached a picture of H.E.R.O. running below and you can see that the right side of the power bar (that should be red) is instead alternating red and green across the scan lines.

 

I've tried twiddling the colour pot and reseating the chips and this has had no effect.

 

Anyone got any ideas?

 

Thanks in advance

It seems to be a problem at TIA CHIP.

Is the TIA soldered to the board or does it use a socket?

If it is soldered, try resolding it and if it is in a socket, try a new socket and cleaning all the CHIP terminals before reinstalling it.

The CHIP may also be defective.
You could also have any SOUND oscillator´s signal being mixed with the video signal. Did you remove the transistor and inductor from the audio mixer oscillator circuit?
May I see the schematics for the console you own???

[CD4050 A/V mod on PAL atari 2600]

Hi @alex_79
Sorry for rebirth an old post but please let me know..
You tell that used the https://atariage.com/2600/faq/index.html?SystemID=2600#composite (4050 schematic) for build your project.
My question is. 
On the real console there are already several components to make the Lum 0, Lum1, Lum2, Color and Sync lines up to the RF MODULATOR´s input.

Should I leave those components as they are or should I remove them from the Atari board?
If I leave them as they are, won't they interfere with the signal from pins 2, 5, 7 and 8 of the TIA CHIP that I will use for the new 4050 MOD circuit I am building?
Thank you friend.

[Simple DIY composite video mod]

9 hours ago, ChildOfCv said:

The biggest problem you might have is to find a FMS6400, as they are apparently obsolete.  You can find people that claim to sell them, but whether you get the real thing or not is another question.  I guess if you're looking for a fun project to do yourself, it might keep you busy.

 

Otherwise if you're going beyond a simple amplifier, I'd suggest the UAV currently sold by The Brewing Academy, which has a newer technology of encoder as well as a color timing correction to prevent bleeding colors.  And it also has both composite and S-video output options.

 

Thanks for replying friend. I live in Brazil.  UAV really appears to be the best choice (and very cheap to most of worldwide money) but unfortunately, due brazilian money currency, the total cost for it plus (cheapest) shipping is very very very expensive . 😥😥

[Simple DIY composite video mod]

Nobody????

 

An update. 

I tried a new TIA chip and a new x200 NTSC xtal but the issues remains the same.  When I set the color switch to B/W the colors goes off but is still possible to see the interferences. The console appears to be ok. 

About the mod circuit, all connections is as short as is possible, good ground. I can't understand the reason to all issues. 

[Simple DIY composite video mod]

Only a curious thing.

Found this schematics in the  internet.
What do you all think???

 

 

[Simple DIY composite video mod]

@the_crayon_king thanks once more. My great interest on this mod is that it takes the video information all ready to use at RF modulator. The CD4050 mod works very well but to build it and install it takes a lot more of time and work. And we must to put and tie the pcb (bigger than the other mod) in some place instead only to soldering in original modulator holes. 

[Simple DIY composite video mod]

@simon.plata @the_crayon_king

Thanks for replying!!! About the audio, sure. The first I made before to start the mod I removed transistor, inductor, resistors and caps. Impossible audio to mix with video because audio oscillator no longer exist! Could it be a ntsc system color issue??

Don't know what is the matter. ,,,😥

[Simple DIY composite video mod]

8 hours ago, pcrock said:

 

I just tested in LED TV.  The results were very very very very BAD!!!! ahahahahah

I tested both consoles with the same AV cable, same power supply, same LED TV and same cartridges! The one that uses the CD4050 AV mod works very impressive well!!! But the one with the AV mod we are discussing here shows a very poor quality screen with a lot of interferences and ghost. Now I can see that even in CRT tv, the interferences exist (not so bad as in LED screen but it is still there).

Below I post the last pics about the AV circuit from the friend Simon.Plata

 

 

 

 

Below I post the issues at LED TV

 

 

 

 

Below I post some Pics from the console using CD4050 AV mod. Very clean, great colors and sharp graphics. If you see any issue in the pics below is from my cellphone camera. Actual graphics is very impressive good! The black Background is very clean with no interferences or noisy issues. 

 

 

 

If someone have any idea, I really would like to use the circuit from friend Simon.Plata. 

Thanks

[Simple DIY composite video mod]

Another thing I noticed is that I can't get a red color at all !!

The best I can get is something more like brown. I've tried to do the color adjustment but I never get close to the color red. I'm testing at CRT right now. I can never make it look like the emulator.

See below both, Stella and real console running the same game at the same time at the same CRT screen.

 

 

[Simple DIY composite video mod]

40 minutes ago, batari said:

I see the circuit above lacks the 75 ohm series resistor at output, as specified in an example below and present in most video output circuits that I have seen (including the one in the above post). I personally would not leave this out.

 

 

I added the 75R serie resistor as you recommended and the results (IN CRT) were GREAT!!!!!

The vertical awful interferences has disappeared almost completely!

The screen is now well more clean than before!
The bright is still less than the desireble even with the trimmer setted ro 0K.

After added 75R serie resistor, the trimmer acts a lot more!!!!!!
In the Led TV I will able to test the device only later at night. I am at the lab now and the Led TV is at home. The serie Resistor changed a lot (to better) the results!
Any Idea about the poor bright and dark colors?
I am very sure that there are NO errors on the building the circuit. Checked up a lot!

I need that the circuit work well in LED TV models. This console will be used only with LED TV.
Thanks again friend!

[Simple DIY composite video mod]

1 minute ago, batari said:

I see the circuit above lacks the 75 ohm series resistor at output, as specified in an example below and present in most video output circuits that I have seen (including the one in the above post). I personally would not leave this out.

 

 

Thanks friend! I will do the test now!