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DavidMil

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Everything posted by DavidMil

  1. Can I get a little feedback about the reasons why users would prefer either a Side2 or a AtariMax 8Meg cartridge? Some info about strengths and weaknesses of both. Thanks, DavidMil
  2. My boys were 8 and 10 when we bought this machine. They put it through hell. There are more scrapes and scratches on this poor old 1200XL then on a car in a destruction derby. It's been in the attic for a long time, but I'm happy to report that it is now working better than ever! The only problem that I have with it now it is that I have to 'dink' with the color on the flat panel TV when I'm playing 'Eastern Front' because in the winter you can't tell the white Germany unit from the snow. Life can be very tuff! Thank you all for your input! David
  3. So you don't remove Q8 and all the other components from the 2002 upgrade anymore? David
  4. Sorry DrVenkman. Here's a picture of all the bad/loose pins: Don't know why but the pins in the PIA chip were fine. I don't think I every replaced it before... DavidMil
  5. I've modified all of my 1200XL's with a video upgrade from a guy named Bob Woolly. I use his ClearPic 2002 upgrade. The improvement is really amazing! Especially when using S Video. I don't know if he ever did another improvement to this upgrade... Anyone Know (hint, hint Bob)? DavidMil
  6. Google ZD915 desoldering station. You'll find them on eBay for about $10.00 less than Amazon. DavidMil
  7. Thank you Nezgar. If you can swing the $120 or so dollars, it's really worth it. I removed all those bad sockets in a little over an hour. David
  8. After I changed out all the sockets and the machine quit being 'flaky', I tried swapping out the crystals. You would think that .0009 MHz wouldn't create any problems, but it was enough that the 1200XL came up and worked without any problems... Except there was no color, only a black and white image. Like you said Stephan," Always use the proper crystal." DavidMil
  9. The post before this one locked up and I can't do anything with it, so I just added the picture here. Like I said, I do like machined sockets. DavidMil
  10. I do like those machined sockets. Here is a picture of all the sockets that I had to replace.
  11. The saga continues... After reflowing all the components within an inch of R13, I decided to do the GTIA chip too. When I pulled out the chip, part of the single wipe pin from position 21 fell out of the socket too. I thought I had discovered my problem but when I desoldered the socket several other pins fell out of the plastic before I could even turn the board back over! Not good, not good. So I decided to look at the ANTIC socket too. Yes, several of the pins were very loose there too. Only two pins fell out while desoldering that socket. One fell out of the CPU socket too. So now I've decided to replace every socket on this 1200XL. I don't have enough 40 pin sockets to replace all of them now, so tomorrow I'll call Brad and order some more. I have a special feeling for this old computer, or I swear I'd pull all the chips out and drop the system board in the garbage at this point! DavidMil
  12. I don't suppose you have any idea what happened to that program? I'd like to have a look at it. Just curious... DavidMil
  13. Despite the common idea that Atari removed all the covers on the RAM cards for heat dissipation purposes, the real reason was to cut down on costs. That said, those cards could get REALLY hot in A800's that were used to run BBS's. It took a lot of heat but the 800's would eventually lockup after a time. Just ask anybody that ran a very active BBS (meaning lots of up and down loads). My friends that ran active BBS's always removed the covers from the RAM cards and also removed the large plastic piece that covered the RAM and cartridge slots. And some sysops positioned a fan to blow on the computer too! Atari also ended up removing the brown tabs that held the RAM/ cartridge cover on the machine and replaced them with screws to save a few more pennies towards the end of production. DavidMil
  14. Yes I do know about the holes. But I wanted to keep the channel selector switch. This location only caused me to cut two traces and forced me to relocate a cap. David
  15. There is a DIN connector on my 600XL. I know, I put it there. Pictures are better than words so have a look... This is the machine that was lost in the attic for many years. I had started to do another upgrade and it wouldn't work, so I got disgusted and sent it to the attic. I found it the other day and after playing with it a bit, I decided to do it a different way. It looks good but I'd like to add chrominance to pin 5 to see if that would make it any better. Right now it's a little bit 'grainy'. David
  16. There is a DIN connector on my 600XL. I know, I put it there. Pictures are better than words so have a look... This is the machine that was lost in the attic for many years. I had started to do another upgrade and it wouldn't work, so I got disgusted and sent it to the attic. I found it the other day and after playing with it a bit, I decided to do it a different way. It looks good but I'd like to add chrominance to pin 5 to see if that would make it any better. Right now it's a little bit 'grainy'.
  17. xrbrevin, This must be for a PAL machine. My American 600XL doesn't have Q7, Q8, Q9, nor any of the supporting components. There is no L12 or R124 on my board either, just empty locations there too. DavidMil
  18. This is the one that I've been using for over a year now, and it works really great. Only problem is that after extended usage you have to clean the clear tube and change the filter in the tube also. If you don't the long barrel will plug up fairly quickly. Then you have to crank up the temperature to 900 F. degrees to melt the solder out of the barrel. But then you will have this same problem on any desoldering station if you don't clean it after each use. DavidMil PS. I'd rather shoot myself in the foot then use any type of digital social media arena. I don't feel the need to take pictures of my lunch and send it to everybody! DM
  19. Does anyone have a modification to add Composite Chrominance to pin 5 of a 600XL? I'm not interested in any other types of video upgrades for the 600XL (boards, chips, etc.). Just a Composite Chrominance to pin 5 upgrade. Suggestions would be appreciated. Thank you all, DavidMil
  20. We used to have a LaserJet II that worked beautifully with our Atari computers. Some people say you needed a special cartridge to use the LJII with Atari's but that was only if you wanted to take full advantage of the printers capabilities. David
  21. Well so much for my Crystal solution... I don't remember what I was doing but I pressed down on the board just a bit to the right of R13 and the screen went black and the computer locked up. So I guess I'm going to reflow every thing around R13 and then I'll break out the wife's high powered magnifier to look at components. Also I'll have to connect the leads to end points of all traces around there and press on the board again to see if I get any open traces. It's a good thing I enjoy (well mostly enjoy) figuring out these kinds of problems. David
  22. ClausB, What a waste of a LaserJet 4Si. I never met one that didn't have at least 1 million pages printed. Other than a full maintenance kit, about the only thing that ever went bad was the laser assembly. David
  23. Pin 28 of the GTIA chip was where I first discovered the problem. The 1200XL field service manual is so poor I use the 800XL manual for trouble shooting. It says that no color or bad color (which I started having first) could be the clock circuitry. It was like the oscillator circuit was 'skipping a beat' every now and then. The scope would have these random very short 'flat lines' (where the voltage didn't move). And then it would start up again. And yes I was putting the test lead directly to the crystal. Thank you for the new knowledge! Ok, I'm open to suggestions here... David Other things: This was my first 1200XL and the boys played it for hours every day. I know for sure that it was dropped at least once. But there is now telling what kinds of torture a couple of boys could do to a computer over the course of several years. I've done the 'simple' trouble shooting (swapping all the chips including the delay chip) with known working chips in my other 1200XL. The problem stayed with the bad 1200XL. VRegs are solid and stable. Game cartridges work fine except there is no color (or just a flicker of color every once in awhile), at least until the machine locks up. DM
  24. Please, don't beat your printer. Personally I've always preferred Epson printers for use with all my Atari computers (unless I was doing color graphics). David
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