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Everything posted by hueyjones70
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I am working on a 800XL that doesn't go to self test when I boot while pressing OPTION. Any ideas of the possible cause.
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Atari 600xl 64k memory upgrade methods
hueyjones70 replied to dimfil's topic in Atari 8-Bit Computers
Where is the best source of the xx64 memory chips? -
This is totally unrelated to the topic but I started trouble shooting another 600XL and ever IC that I checked (about 10, all of the large one and a few of the smaller) was bad. Then I noticed that one of the posts on the power switch had some damage. It looks someone made contact with that post and a live wire at the same time. Must have been working with the power on or at least with the power connected. I suspect that every component on the board is fried.
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If I install the din connector and do nothing else to the board, should I be able get composite video?
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I don't normally have any trouble either, I have completely socketed a 130XE with no problems but that 600XL just gave me a lot of problems.
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Thanks for the pictures. I set everything up like the pictures and I still could not get a luma connection. I believe I must have lifted a trace somewhere as I was desoldering some of the components. I went ahead and installed a UAV and everything works exactly as it should. I will post pictures of the UAV installation tomorrow. I may try the SV 2.1 on another 600XL but it sure is a lot of work compared to the UAV and the 600XL boards seem to be very low quality compared to the 800XL boards. I think I had three or four solder rings come off when I was removing components. I lose one on an 800XL almost never.
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Pictures would be great.
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I have just attempted to upgrade a 600XL with the SuperVideo 2.1 mod. I must say that it was the most difficult Atari mod I have ever attempted, mostly due the extremely confined working conditions. I apparently don't have a Luma signal. The SV 2.1 instructions say to run a wire from the junction of R123 & R124 to pin 1 of the DIN. I have done this and my video display is a colorful unstable picture that resembles an old time TV picture that had the horizontal and vertical hold out of adjustment. It is the same picture I get from my 800Xl when I disconnect the luma cable. I noticed that the mods in this article say to run a wire from the emitter post of a transistor. I don't know which post is the emitter. Any help would be appreciated. PS I think my next 600XL mod will be with a UAV.
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800XL not responding to keyboard input
hueyjones70 replied to hueyjones70's topic in Atari 8-Bit Computers
I tried one mechanical and two mylar and got the same result. I will try cleaning the contacts and check the ICs. I forgot to mention that before the unresponsiveness started, when I turned it acted as if a key had been pressed and had gotten stuck. That led to the disassembly of the computer and checking other keyboards. The stuck key effect didn't happen again. -
I have an 800XL that does not respond to keyboard inputs for ESC, and the 1-6 keys. I thought I had a bad mylar but I tried two different mylars and a mechanical keyboard. When I used the mylars and the keyboard on a different computer, everything worked as it should. Where do I start my search for the problem?
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I will attempt to attach some pictures of my first successful attempt. I had do some modifications to the case and I also used some wood strips as spacers. I used the wood because I needed to elevate the drive by 1/4 of an inch and I have the carpentry tools to get spacing pretty exact. I will use a file to smooth out the opening for the drive selector. I wish I hadn't used a case that was chipped. I did it because I didn't know if I would be able to make everything work and I didn't want to ruin a good case.
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Thanks for the information, I will try to get that done in the next week or two.
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I don't have anything yet and I definitely don't have any files. I could probably come up with a mock up in a couple of weeks. If I actually knew anything about 3D printing I could probably get the job done locally.
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Does anyone know where I or anyone else could get something 3D printed from a prototype or a sketch. I don't have the knowledge to make a print file but I could make a prototype out of cardboard or wood and I could also make a detailed sketch. What I am interested in making is a set of panels to glue to the front and back of a SF315/354 case so I could install a standard 3.5 floppy in those cases and have them look like they belong in the case.
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I just realized that I have been using .1uf 50V multi layer capacitors where I should have been using .1uf 100V multi layer capacitors. I have done this on three boards and they are performing well. Does anyone know what effect will this have on the long term life of the board and should I replace them all?
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Power supply for 400/800/1200/1050 etc
hueyjones70 replied to hueyjones70's topic in Atari 8-Bit Computers
I did not try it on any equipment. I always check power supplies with a multimeter before I use them. -
Power supply for 400/800/1200/1050 etc
hueyjones70 replied to hueyjones70's topic in Atari 8-Bit Computers
The transformer is sold by Tpower. You can find the on eBay, Amazon and numerous other places. -
Power supply for 400/800/1200/1050 etc
hueyjones70 replied to hueyjones70's topic in Atari 8-Bit Computers
I meant to say that the transformer that I bought does not have an output amperage nor a VA listed. The only thing that it gives is the output voltage of 9-12 volts. It is advertised as being a replacement for the C017945.