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The UAV Rev. D Video Upgrade - Installation in an Atari 7800 PAL

UAV Installation Guide Atari 7800 PAL

9 replies to this topic

#1 JAC! OFFLINE  

JAC!

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Posted Fri Sep 8, 2017 5:51 PM

The UAV is a great thing. You can find the details here:

http://atariage.com/...upgrade-thread/

 

The single board can be used in virtually every Atari 8-bit console and computer. But since there are differences per machine and per UAV revision, you have to know exactly which wires, jumpers and pins are really relevant for your configuration. The long nature and discussion in the main thread make it hard to find the right information. Therefore I decided to create this separate thread.

 

Things you have to know when installing the UAV Rev. D in an Atari 7800 PAL:

  • You cannot rely on any of the NTSC descriptions, because the PCB layout of the PAL version is completely different.
  • You do not have to remove and existing parts from the board for the UAV itself. You may have to remove parts to grab the audio correctly, but that is a separate topic and not related to the UAV itself.
  • You have to use the UAV BASIC Rev. D board without connectors because there is no driver 4050 chip in the Atari 7800 but a 7432 chip which combines the video signals from TIA and MARIA into one. Basically you grab most of the required signals from the resistors connected to the 7432.
  • You will typically not be able to read the Rxx, Cxx labels on the populated board. Therefore is it important to know where to connect what. When connecting to resistors, use a meter to check the value of the resistors to make sure you are at the right place.
  • The Atari 7800 PAL schematic from Jerzy Sobola is very good, but incorrectly states R29 to be 12k but it is 82k.

I have created the attached pictures and the corrected version of the schematic for this. The yellow points indicate the solder points on the PCB,

Note that on the "wires 1/2" pictures the yellow and orange wires were yet at the wrong pins on the UAV board. Use the ones in the "UAV Points" picture.

 

Attached Thumbnails

  • Atari 7800 PAL UAV Points.jpg
  • Atari 7800 PAL UAV Wires 1.jpg
  • Atari 7800 PAL UAV Wires 2.jpg
  • UAV Rev. D Basic Board Connections.png
  • 7800sch.gif


#2 Jinks OFFLINE  

Jinks

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Posted Fri Sep 8, 2017 8:23 PM

Crap is the a ton of solder points!
And goodbye interlacing video?
Anyone play tower toppler bonus round and compare to the RF version?

#3 Bryan OFFLINE  

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Posted Fri Sep 8, 2017 9:14 PM

Thanks for the info! Especially because I don't have access to a PAL 7800.

 

One quick correction, these are the input pad locations.  They are different than Rev C.

 

Attached Thumbnails

  • rdpads.jpg


#4 JAC! OFFLINE  

JAC!

    Stargunner

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Posted Sun Sep 10, 2017 6:30 AM

Crap is the a ton of solder points!

That's because there is no 4050 to plug and play with. There are 8 solder points and they are all simply on one end of a resistor, so actually easy to do and remove if required.

 

One quick correction, these are the input pad locations.  They are different than Rev C.

Funny enough the Asteroids looked OK on the CRT, but the LCD complained with no-sync. Tigerduck adapted the soldering and reports it's all fine now. I've updated my pictures accordingly. And now I feel like I have the black belt in MSPAINT :-)



#5 juansolo OFFLINE  

juansolo

    Chopper Commander

  • 219 posts
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Posted Wed Sep 20, 2017 11:55 AM

Things you have to know when installing the UAV Rev. D in an Atari 7800 PAL:

  • You cannot rely on any of the NTSC descriptions, because the PCB layout of the PAL version is completely different.
  • You do not have to remove and existing parts from the board for the UAV itself. You may have to remove parts to grab the audio correctly, but that is a separate topic and not related to the UAV itself.
  • You have to use the UAV BASIC Rev. D board without connectors because there is no driver 4050 chip in the Atari 7800 but a 7432 chip which combines the video signals from TIA and MARIA into one. Basically you grab most of the required signals from the resistors connected to the 7432.
  • You will typically not be able to read the Rxx, Cxx labels on the populated board. Therefore is it important to know where to connect what. When connecting to resistors, use a meter to check the value of the resistors to make sure you are at the right place.
  • The Atari 7800 PAL schematic from Jerzy Sobola is very good, but incorrectly states R29 to be 12k but it is 82k.

I have created the attached pictures and the corrected version of the schematic for this. The yellow points indicate the solder points on the PCB,

Note that on the "wires 1/2" pictures the yellow and orange wires were yet at the wrong pins on the UAV board. Use the ones in the "UAV Points" picture.

 

 

 

Awesome post dude, just dropped a UAV into my PAL 7800 following your instructions and it works marvellously. A little bit of jailbar interference, but it's nothing major at all. Really quite pleased with the results.



#6 juansolo OFFLINE  

juansolo

    Chopper Commander

  • 219 posts
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Posted Fri Sep 22, 2017 2:23 AM

Some pics from mine.

 

 

Attached Thumbnails

  • Aster1.jpg
  • Invaders.jpg


#7 Stephen OFFLINE  

Stephen

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Posted Thu Sep 28, 2017 6:02 PM

Wow - JAC - does this mean we should look out for a 7800 demo soon?   :D



#8 JAC! OFFLINE  

JAC!

    Stargunner

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Posted Sat Sep 30, 2017 9:39 AM

Wow - JAC - does this mean we should look out for a 7800 demo soon?   :D

That's been on my list for years, but it not going to happen any time soon :-)



#9 save2600 OFFLINE  

save2600

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Posted Sat Sep 30, 2017 9:51 AM

Yo' juansolo... your colors are waaaaaaay off! Can you not dial them in by adjusting the bottom trim pot inside your machine?

#10 juansolo OFFLINE  

juansolo

    Chopper Commander

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Posted Sun Oct 1, 2017 2:24 PM

Yo' juansolo... your colors are waaaaaaay off! Can you not dial them in by adjusting the bottom trim pot inside your machine?

 

 

I actually blame my camera. To the naked eye Space Invaders are yellow, the barriers orange and the bottom grey. The camera really seems to go a bit mental on colour for some reason. Also that's a PAL 60 conversion SI... Of which I have 3 and they all come out with completely different colours... ;) Also the NTSC colour palette and PAL one are quite different.


Edited by juansolo, Sun Oct 1, 2017 2:25 PM.






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