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jnharmon

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About jnharmon

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  1. Does anyone know either a source for, or the specifications for, replacement belts for the Japan-made Atari 1010 tape drive? Thanks!
  2. A few years ago I replaced the belts on my 410 tape drive, and it seemed to be working OK. Recently, when I was loading from a tape, the take-up spindle stopped rotating and the tape continued to feed, ruining the cassette. Fortunately this wasn't one of my original tapes. Does anyone have a reference to the proper procedure for replacing the belts and cleaning the pulleys? One of the belts was very hard to replace (the one pointed to by the red arrow in the attachment) and I am wondering if it was done properly. Just trying to fix the problem and try to ensure I don't lose any more tapes.
  3. Thanks. Where can I find "low profile" connectors? I've haven't found any two row IDC connectors advertised as such? I have no problem soldering in a new connector on the U1M board, but I don't have the tools to properly de-solder the existing ones.
  4. Mine is the type 4 with the metal plate over the entire back of the board. Would be interesting to find out which variant gives the most clearance, assuming there is a measurable difference..
  5. Thanks for the advice. I'll video the 1x SIO issue and post a link for reference. I do have the latest firmware now. Getting it was part of the problem. I needed to use SDX to load the image with the update for the firmware. But after I found a happy speed, I was able to update to the latest firmware.
  6. I just completed the installation of an U1M into my 600XL that I had previously upgraded to 64K and added UAV video. Everything seemed to work fine with the exception of when SpartaDOS X was enabled, it was unable to read from the SIO2SD. If SDX was not enabled, it had no problems working with the SIO2SD. I eventually found that on the SIO2SD if high speed IO was disabled, SDX would not work. Also if it was set at too high a speed, it would not work. Setting it at a mid range speed allowed it to work without issue. Is there some resource about the optimal configuration and the limitations of this combination of U1M, SDX, and SIO2SD? Thanks, Jason
  7. I was able to get it to fit (just barely) by removing the strain-relief straps. There is still a bit of interference and without gentle pressure the case stays about 1/8" open on the right side. Gentle pressure is enough to get it to close all the way. I've yet to file off the corners of the connectors, but that will be my next step after new connectors arrive which will also allow me to shorten the cables (I didn't have luck in removing the existing connectors and didn't want to break them). This does make me wonder about your comments regarding variations in the keyboards. I'll take a few photos with measurements , especially of the thickness of the metal case enclosing the back side of the keyboard. Would be interesting to compare to others to see if there is a difference. Thanks, Jason
  8. Hmm. If you look at the U1M screw hole as a reference, it actually isn't anywhere near an inch from the back. The mounting hole on mine was drilled just at the top of the J2 label where the red dot it shown below. It might be about 1/8 of an inch more forward than yours, and a bit more towards the SIO port, but not very much. If the angle of the XL keyboard is about 25 degrees, being 1/8 of an inch forward would reduce overhead clearance to the keyboard by (1/8 inch) * TAN(25 deg), or about .058 inches compared to your install. Some, but not enough alone to account for the issue. I think the combination of the relief strap and the cable going over the top of the strap probably add enough to account for the issue.
  9. The board is as it came from Lotharek. It does look like other versions of the board did have right angle connectors.
  10. Right after I posted this, I trimmed the standoff a bit more under as you suggested, the battery holder is resting on the cable adapter below it. It is still about 3/4cm too tall to fit. I think JR is spot on here. The ribbon cable connector (the piece on the cable) is far too tall. It appears to be a higher profile piece than the one shown in your video. Any suggestions on where to find a lower profile connector? I've done a few searches and am not coming up with anything useful.
  11. I got it installed and it works, but I don't see any way to make it physically fit in the case as the new vertical ribbon cable connectors are way to tall to fit under the 600XL keyboard. It looks like the cable ends on mine are taller than the one in the video. About the only two things I can think of are removing the RF modulator and trying to put it in that spot or removing the ribbon cable connectors and soldering the ribbon cable directly to the U1M board. Advise from who has anyone who has solved this problem would be appreciated.
  12. Does anyone who has already done it have a recommendation on the physical placement of an Ultimate 1M in a 600XL? I recently upgraded a stock NTSC 600XL with a UAV and 64K and just received the U1M board, and am looking for suggestions/photos of people's installations. Thanks
  13. Out of curiosity, I swapped the two IN41464P-10 RAM chips I used with two NEC D41464C-12 chips and the problem vanished. I can now turn it off and right back on and get a good cold boot each time.
  14. I have a Bit3 card for my 800 and am curious whether it would work with an Incognito. Has anyone tried this combination? My guess is that it would overlap address space used by the Incognito, but I'm not sure.
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