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RSwipeCA

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About RSwipeCA

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    Space Invader

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    Ontario Canada
  1. Ah that's great info guys. Thanks very much to all of you.
  2. Oh ok that's great info. May I ask what type of drive you recommend? Just a standard every day PC floppy drive?
  3. Hi all. I recently acquired a great condition 520ST setup. It came with a SF354 external floppy drive. The previous owner said there was a problem with the drive, so I opened it up to take a look. The drive responds to a disk when its inserted and tries to spin up, but there is no belt connecting the motor to the disc drive mechanism flywheel. I am guessing that the belt fell off and somebody removed it from the case. What's the chances of getting a replacement belt for this drive? I've searched on the net but it doesn't look too promising. Alternatively, is there another drive that I can put inside the case of this drive, if I cannot get a replacement belt? The drive is a Chinon F-353AT RevA Thanks guys.
  4. Do I really want another one???? Might have been the wine talking. lol.
  5. Well thanks for all your help everyone. I am running with the original SALLY, ANTIC and GTIA chips, go figure!? But, replaced overheating Ram, Capacitors, MMU and socketed everything (Ram removed and replaced twice lol). It's all good! .... Now I need a new broken Atari....... Have a fantastic 2015 everyone!!!!!! Damian.
  6. Yeah! But at least it's good practice swapping them out. Now I have a nice board fully socketed, that makes me sleep better at night.....
  7. Just waiting on my new MMU arriving, then I will post an update. In the mean time..... Merry Christmas everybody, and may you have a safe, prosperous and Happy New Year. Thanks for all your help! Damian.
  8. I forgot!!! I also changed the RAM chips as a couple of them were almost too hot to touch in the beginning. But yes, its looking good! Will keep you posted on the chip swaps guys.
  9. Hey Everyone. Sorry for the delay, I was away AGAIN with work. If we didn't need the money eh???? Anyway, it looks like we've cracked it! I got around to socketing the entire board - good practice with the solder sucker and the iron. I started removing all the chips one by one and putting them into my good 800XL. It turns out that the only chip that 'kills' my good XL is the U3 C061618-16 8434FMM MMU. I put my good C061618-16 into the bad XL and it displays the normal blue screen and READY prompt!! Now, so far I have replaced with new, the U17, U7, and U8 chips. I don't know if this machine is now working because of a combination of the new chips and the good MMU U3 chip from my other machine or not. What I will do is swap back in the old suspect SALLY, ANTIC and GTIA chips one by one and see if it has any effect. I now need to get my hands on a newC061618-16 8434FMM MMU chip. Where would be the best place to get one of those? I have attached two images. The chip 'in socket' is the good one that works in both XL's. The chip placed on the board is the defective one. They have slightly different markings - same C061618 number though. Will I have to find the exact same 'Good' chip? Question, can I use an Epprom burner to 'make' a new MMU? How does all that work? I will keep you posted on the U17,U7,U8 swapping. Thanks again guys. Looks like we brought another XL back from the trash can. Damian.
  10. Thanks Bob. Just got back from business trip. Will look into it and post findings. Ok. Yes Pin 11 on U18 is GREEN LOW LED Pulsing Beep Flashing Orange LED and Pin 12 is RED/GREEN LED Lit Pulsing Beep Flashing Orange LED. Different. I will now begin the process of socketing the remaining chips. I will then check one by one using my working XL. Thanks for your help. Will let you know.
  11. U18 PIN 12 RED/GREEN LED Lit Pulsing Beep Flashing Orange LED - same as CPU 39. U18 PIN 13 RED LED HIGH
  12. U17 PIN 30 is GREEN LOW Pulsing beep Flashing Orange LED Many thanks Bob.
  13. CPU 39 is both RED/GREEN LED Lit plus pulsing beep and flashing Orange LED CPU 40 is RED HIGH ANTIC 29 is GREEN LOW
  14. I now have sockets for all the chips. I am going to start the process of socketing the remaining chips on my board. Should make things a little easier on this 800XL.
  15. Yes, I am using that now thanks. I have just checked all the ram chips. According to SAMS and according to my good XL all the RAM chips U9 to U16 are HI on pin3 when they should be P. Chips U9 and U10 Pin6 should be P but are 0 dead. All the chips on my good XL are as per SAMS Schematic. Chip U2 looks problematic from a probing standpoint Pin4 should be P its 0 Dead. And Pins 10-15 should be P but are all HI no pulse. lol @ "If you're looking for something to replace next". All fun and games.
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