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Zoober1016

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Posts posted by Zoober1016

  1. Posted

    I realized I was probably just complicating things. Some people have plans to install more RAM (up to 1MB) to run some of the more exotic things being released (mostly demos). If you're going to leave it as a 64K machine, it doesn't matter which Antic you have.

    I will just leave it as a 64K machine then. Let me know when you will send board back and how you would like me to handle the return shipping costs.

  4. Posted

    That'll work, just send the mobo. I won't charge anything except return shipping unless soldered in stuff needs replacing, plus a few bucks for whatever chips I need. If it just needs a couple RAM chips, that'll be on the house. I'll let you know ahead of time.

    Could you please provide your shipping address? I will try to send out this weekend.

  5. Posted · Edited by Zoober1016

    If you had a bad power supply then you might have several failed chips. The easiest repair path is to have a fully socketed 800XL (luck of the draw, I'm afraid) that you can swap in and out of.

     

    If you want to send me the socketed chips from the machine, I'll test them and send them back (just make a good diagram of what goes where).

    I really don't have any anti-static foam or padding to send these chips to you. Would it be OK for me to send the entire system board? Also, how much would you charge to test the board and replace the defective components? I don't want to spend alot of money to get this unit working.

  6. Posted

    "insert a cartridge and hit START" is not going to work on any Atari, working or not. You have to insert the cartridge and power on.

     

    On the other hand, if that chip is bad, yes, it is one of the memory chips. Which Atari do you have? Where are you located - I have a million of these chips...

     

    Bob

     

     

     

     

    I have a chip that gets warm when the unit is powered on. I believe this is causing a problem where nothing happens when I insert a cartridge and hit Start. This may have been caused by a defective power supply which has been replaced. The monitor is good. I swapped the chip to another location with one that wasn't getting warm to confirm the chip was the problem, not the location. Does anyone know where I can get a replacement chip to see if this fixes the problem? The chip is a Mostek MK4564N-15IRL and was originally in location U15. There is also another number C060612-009. I think this is a memory chip, but I don't have a schematic to verify. Any suggestions would be appreciated.

    I already tried inserting the cartridge and turning on the power, but this didn't work. I have an Atari 800 XL and live in Phoenixville, PA. Do you think this is the only issue or could other chips have blown also?

  7. Posted

    If you have a RAM chip that's getting hotter than its neighbors, then it's bad. I hope you only tried it in one of the other 7 RAM sockets.

     

    You need 64Kx1 DRAM chips.

    Yes, when I swapped the chip it was in one of the other RAM sockets. Do you think this is the only problem or do have other suggestions?

  8. Posted

    I have a chip that gets warm when the unit is powered on. I believe this is causing a problem where nothing happens when I insert a cartridge and hit Start. This may have been caused by a defective power supply which has been replaced. The monitor is good. I swapped the chip to another location with one that wasn't getting warm to confirm the chip was the problem, not the location. Does anyone know where I can get a replacement chip to see if this fixes the problem? The chip is a Mostek MK4564N-15IRL and was originally in location U15. There is also another number C060612-009. I think this is a memory chip, but I don't have a schematic to verify. Any suggestions would be appreciated.

  9. Posted

    Hum or buzz... similar thing.

     

    If you're running to a monitor using A/V cables then there should normally be no noise over audio.

     

    I got a machine on eBay and the power supply is bad and generates audio hum - I've never used it again.

     

    Running your Atari with it is very likely skating on thin ice. Can you post a pic of the power supply? There are known bad ones that are notorious, so we'll know right away if it's one of them.

     

     

    Here is a picture of my power sipply. I'm new to this site so I hope I attached the file correctly. If you think the supply is bad, would I just need to replace this or could it have damaged my computer, too?

    post-27190-128295117777_thumb.jpg

  10. Posted

    Hum or buzz... similar thing.

     

    If you're running to a monitor using A/V cables then there should normally be no noise over audio.

     

    I got a machine on eBay and the power supply is bad and generates audio hum - I've never used it again.

     

    Running your Atari with it is very likely skating on thin ice. Can you post a pic of the power supply? There are known bad ones that are notorious, so we'll know right away if it's one of them.

     

     

    An update to my problem: I discovered that if I disconnect the black audio cable on the back of the monitor, the hum disappears. Also, I can now see a display on the monitor, but it is just a bunch of lines. Do you think the Atari is OK and I just need to replace the monitor? I'd like to narrow down the problem to one or the other device?

  11. Posted

    First up, try without a cartridge.

     

    Secondly, buzzing is a symptom of a power supply that's gone bad and feeding too much voltage to the computer.

    If that's the case, then it can fry the innards of the computer.

     

     

    Thanks, I will try that. The noise is actually more of a hum rather then a buzzing and I do have the power light illuminated. It would be nice to have a spare supply, but unfortunately I don't.

  12. Posted

    Hello,

    I have an Atari 800 XL attached to a Taxan monitor using a composite video cable. When I power up the computer with a cartridge inserted, there is a humming or buzzing sound and no display on the monitor. I have tried holding down the Option key while powering up and this didn't make a difference. Since I don't have a spare monitor or Atari to try, I'm not sure which device is causing the problem. I have tried the TV switchbox on my TV, but there is still no display. However, this may be due to an incompatibilty problem. Has anyone come across this issue before and could offer troubleshooting suggestions? I'd appreciate any advice. I really enjoy playing the old time games and would like to get this working again. Thanks

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