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_The Doctor__

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Posts posted by _The Doctor__

  2. Posted

    Sounds spot on, I had an 800 XL with the same thing going on as it was boxed up for years.... I used quick dry contact cleaner on the sockets and chips then put em all back in and it worked again no problem... I had a 130XE with the same symptoms and replaced the ram performing a 320K peterson upgrade and Is still running to this day. So the hum bar screen looks like a power supply and the brown random character screens looks like a cleaning and re seating or ram replacement as I think Rybags is correct on the call

  3. Posted

    wow, my buddy put a scope on it and that long ground path acts like an antenna for everything, lots of random looking dirty noise from everything in and around the Atari, some shielding helped it (aluminumfoil), but I am definately adding the shortened 22 ga. wire from pin 8 of the MMU and pin 1 of the CPU to pin B of the cart connector as suggested by Bob. We scoped the XE just for giggles and putting the shields back on helped clean up the XE a little. I remember a spirited debate about shielding being useless and to be thrown out not too many years ago, Now it seems I will be putting them back on my Ataris as I clearly see the difference on a scope. Truely amazing it worked as well as it did! Monday approaches... What fixes exist for address glitches? I figure since I am knee deep into It I might as well knock out whatever known problems there are while it's apart. I am interested in locating the shielding for the 1200xl if anyone has it.....seeing is believing so for me it's probably best to have it on.

    _Doc

  6. Posted

    Bump,

     

    Okay I have a 1200XL that hates different cartridges as well.... something is afoot... I hadn't realized it as I loaded mostly everything thru disk and just started using carts with is.... steps taken

     

    replaced ram chips, replaced the IC's, sprayed the cart port with contact cleaner...

    it had the sio power done as well

  11. Posted · Edited by _The Doctor__

    Yes, I have the same problems with one of mine, no help from the guy who made it and sold it to me. He basically made a derogatory comment about my being from the United States and told me to go fish... My good one has a green board with nice traces and all the led's as well as potentiometer installed.... the one that is flakey has a red board and he did not install any led's or pots the traces are thinner and is overall not as quality as the first. Sticking with the older firmware is a good idea... the other problem discovered was the supplied sio cord was flakey this caused power to be fluctuating and as the atmega saves to itself and the sd it causes corruption. My solution was to rework the sio cord and put the missing components on the board. I moved the chip from the working unit to the repaired unit and it works fine. Then I put the atmega's back in their original devices and found that the atmega was faulty as suspected. still no help or replacement came so now I need to get the atmega reprogramming done or replaced. Sounds like you are in the same boat. Make sure the cord is rock solid, rework the board and atmega and do not use the 3.xxx firmware use 2.3, 2.4 or 2.5 as stated. She is using one that has version 2.3 firmware and if there are bugs I have not run into them yet.

    Until I get the atmega replaced I will have to go without. My daughter has the good green pcb sio2sd with 2.3 firmware. it ain't broke we ain't messin with it!

  12. Posted

    huh? space harrier plays nice at least on my 130XE ntsc machine for me but crownland is like so much flicker I do not see the enemy half the time..... more invisible than visible anyone else have the same experience? I started to believe it was a pal only game it was so bad... maybe I need to download a different version?

  13. Posted · Edited by _The Doctor__

    I hated the dosboxes and then wintel boxes at the time... The Atari 8 bit was so much better, I enjoyed the megaSTE and TT030, loved the AMI, and settled down with a Falcon030 at the end. The two Amigas kept dying on me for whatever reason... so I gave up on em. The 8 bits all still worked save a 130XE that died of electrical storm causes. The tt030 was a dream and I still wish I had one today. The Falcon.... well the very first thing I had to do was drop in the math co processor and install the higher speed crystal. once that was done it kind of grew on me a bit. I really wished for the Falcon to be everything the TT was plus all the Falcon goodies. Eventually add ons came to that end.

    Pagestream was our DTP workhorse at the time... Cal and Pap came later. I miss the days of being able to get right to work... not waiting on the OS for everything.....

    So at home it's A8, Falcon, and wintel laptop now.

  18. Posted

    listening to all the versions it seems some of the ports did not capture the cat sound in the music which is what helped make this interesting in the first place... Must've got lost in the pop tart cat, star field and music notes and not realized the meow nyan sound of the digi synth.

    the c+4 an a8 seem nice... must have synth neow meow nyan sound must must lol

  23. Posted · Edited by _The Doctor__

    It provides the RF output to the television AND it outputs the Composite Video signal to Pin 4 of the videojack so yes you need it!

     

    you could swap the rf mod. out there really isn't much holding it there.

     

    use the old tv or find out if you can turn tv blue screen off (some let you do it some don't)

     

    First place to look swap the power supply! Do not let it run for long.

    look for leaking or bulging electrolytic capacitors.

    next Swap socketed chips with know good ones.

    next memory, use a know good chip and piggy back it one at a time.

    after that it requires more involved testing of the board.

     

    you took the cover off the rf modulator, what damage do you see?

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