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About ACML

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  1. Must have been due some good karma. I opened up the A16 I recently purchased off eBay and it already had the six RAM sockets populated with RAM, so it came with 64K! I had never really heard of the U Print back in the day, but its nice to have a buffer and the SIO pass-thru in a small interface. I haven't purchased a Fujinet yet, but I'm sure there's one in my future. Just gong to wait for the hardware to stabilize (i.e ver 1.6 maybe). Question: Are 2164 and 4164 DRAMs compatible as long as they are both 128 refresh?
  2. Did you ever get this to work with six 4164s to make it 64K? I now have an A16 and would like to do the same.
  3. By looking at your photo, the resister termination block appears to be there (just right of DS jumpers). I remember that the resister termination block has to be only on the last drive in the ATR-8000 chain. What's the FG, J2 and L1 blocks for? DS1 should be D2: I guess. Maybe some of the empty solder pads are for components that were needed for the ATR-8000 BITD and the new drives just left them off.
  4. I think a DSDD 8" is 26 sectors per side per track, 77 tracks and 256 bytes per sector. That means there is 52 total tracks (26x2 sides) * 77 tracks * 256 bytes/track = 1025,024 bytes
  5. I used MYDOS to format the 1.2MB 5 1.4" as 77 track DSDD disks yielding about 1000 KB. It thinks its an 8" floppy.
  6. Is this what you are looking for? PM me.
  7. I fully appreciate the supply and demand equilibrium, but $531 is not justified by supply. There are almost always 1-2 1200XLs for sale on eBay at any given time and they typically sell for much less. There was nothing remarkable about this unit and there was a bidding war???
  8. Just when you think you've seen it all, an Atari 1200XL just sold for $531. Nothing special about a computer that routinely sells on eBay for less than half the sale price on this one. What's really puzzling, is that it had 73 bids so many people were bidding it up. What am I missing? https://www.ebay.com/itm/Working-Atari-1200XL-1200-XL-Computer-w-Power-Supply-Joystick-Frogger-Game/363334394554?hash=item54986ae2ba:g:wc0AAOSwVT5gXSSq
  9. I have upgraded many 1200XLs with the ClearPic2002 mod and the S-video is great. I just don't see much if any improvement in composite. The ClearPic2002 makes the RF out no longer operative and I believe the UAV still allows RF out. I've put the UAV in a couple 400's and the picture quality on the S-video is very sharp. Didn't notice the composite. If you're only interested in composite, the ClearPic2002 may not improve the picture much, but the S-video is amazing!
  10. It appears that the Fujinet 1.3 hardware still has a few issues to be sorted out. Is there currently a plan to revise the design (i.e. V1.4) to farther refine this hardware design?
  11. Why is the 1200XL also not a worthwhile exception, reliability speaking. I understand your experience with 800XLs and 130XEs as they were built with absolute cost reduction in mind to compete with the C-64. They are totally different animals than the 1200XL in terms of build quality. I haven't used an 800XL since 1989. My experience and comments are limited to the 400/800 and 1200XL.
  12. My experience with reliability is somewhat different. The 800 has seven boards and the 400 has four. All my hardware issues over the many years, excluding the 1200XL keyboard, have been with 800's and 400's. They won't boot due to oxidation on a card edge, a RAM or ROM chip has gone bad, and my all time favorite, it fries the 9VAC brick due to a short somewhere on the PWR board. I've had at least three 400/800's fry my 9VAC brick due to an issue with the PWR boards. I have yet to need to replace a VLSI chip or any other component for that matter in the many 1200XLs I've had. When I see an eBay listing that says "untested", I am more risk averse about a 400/800 than a 1200XL as to whether it will fire up. The lack of sockets on the 600/800XL line is another story. That's just been my experience. The 1200XL and 1400XL design of one board just eliminates durability issues that a mutli-PCB design has. Also, in almost all cases that I've had to fix a 400/800, pretty much total disassembly was required and it's a lot more involved than the 1200XL's 6 screws on case and six screws on board to bottom case to get to the VLSI components.
  13. The 800 was a masterpiece and way ahead of its time. I've always thought Atari styled it after the IBM Selectric typewriter. Maybe to give the appearance of an office appliance. The 400 architecture, now that's something new. It's sleek, minimal footprint looks like an aerodynamic shape. I do believe that the 1200XL, 1400XL design has the best ever. Single board, fantastic keyboard and the aesthetics are stunning. It just looks sexy and refined as 80's tech goes. It loses the 70's IBM Selectric look and looks like the future. I too wanted a 1450XLD so bad BITD, and was very disappointed when it never came to market. At the time, I had no idea of all the financial trouble Atari was in as I eagerly awaited the 1400XL line to show up. At least we have the 1200XL. The 800 is a tank, seven boards and quality throughout (mechanical keyboard, PCB, components). The 1200/1400XL's one board design provides superior reliability. I loved my 800, but I would have traded it in a second for a 1400XL.
  14. Just had the same thing happen on my 1200XL two days ago. Replaced POKEY and PIA and that did not fix. As a last resort, I blew compress air over the board and under the sockets and "BAM!" it works great. This is the second time I've had this issue on two different machines and both times, compressed air magically made them right. I have no idea why, but it worked twice. Same issue, everything worked, but no boot on SIO. Go figure. I used canned air for electronics. Shop air might have too much static electricity.
  15. I was hoping someone out there figured out a way to run the 400/800 version of Omniview on Jurgen's new 48/52K RAM and OS board. My goal is to put it in my 400 with a UAV and my plan was to use the old RF 3/4 channel selector switch to pick which OS to run. I would use the OSb and on the EPROM I wanted to put Omniview for the 800. Has anyone tried this and if so, do you have the 16K EPROM image to burn on the 27128? This would be an awesome setup.
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