ACML Posted October 15, 2021 Share Posted October 15, 2021 10 minutes ago, hueyjones70 said: Has anyone ever tried using alcohol to loosen the adhesive? I'd waive off on the alcohol when you are around those dark carbon traces in-between the mylar and white silicon spacer. If you're not carful, the alcohol will dissolve the carbon trace and it will run (bleed). If you're taking about what to do to make the mylar/spacer peel off the PCB easier, someone suggested using a hair dryer to heat it up making it pliable and it might stick less. I only use the alcohol to clean the traces on the PCB only. I have cleaned the contact pads on mylar (black little circles) being very carful to just dab a Q-tip with a little 91% Isopropyl to clean. Just dab lightly, don't scrub like an eraser. If it doesn't evaporate within seconds, you're using too much. Quote Link to comment Share on other sites More sharing options...
+Stephen Posted October 15, 2021 Share Posted October 15, 2021 1 hour ago, hueyjones70 said: Has anyone ever tried using alcohol to loosen the adhesive? Alcohol is not good at removing adhesive. WD-40 is, as well as some citrus based cleaners like GooGone, but with both, there can be adverse reactions with certain plastics. 1 Quote Link to comment Share on other sites More sharing options...
+x=usr(1536) Posted December 5, 2021 Share Posted December 5, 2021 Just got my second 1200XL. Numbers are: 72R DA 18149 223 Motherboard has stickers reading "DA 213 Rev. A" on the top, with "May 20 1983" on the underside. The machine looks to be stock, but someone has definitely been in here before as the RF shields were missing. Keyboard needs a mylar, but I knew that going into it. Loaded from an (externally-powered) FujiNet just fine and I was able to play Montezuma's Revenge without issue. Picture (at least via the monitor jack) is surprisingly good. Will dig into it further when I have access to a mylar and my regular panoply of tools Many thanks to the AtariAge member from whom I obtained the system. This one will be the stock / reference model; the one I already have will be the one that gets more modifications than just the UAV and 74F08 currently in it. Quote Link to comment Share on other sites More sharing options...
+kheller2 Posted December 6, 2021 Author Share Posted December 6, 2021 554 Units are now on the list. For a while I didn't think we would be able to hit 500. Now I'm looking forward to 600. Go Team 1200! 3 Quote Link to comment Share on other sites More sharing options...
fatwizard Posted January 11, 2022 Share Posted January 11, 2022 Taiwan made. 72 R DA 01337 153 Tag inside. DA 133 REV. A Purchased on eBay. Quote Link to comment Share on other sites More sharing options...
+bf2k+ Posted January 12, 2022 Share Posted January 12, 2022 Both of my 1200XLs are sold. You may remove me from the list if you like... Quote Link to comment Share on other sites More sharing options...
bobotech Posted January 12, 2022 Share Posted January 12, 2022 Oh wow, i never noticed this thread before. I have 5 1200XL systems I believe. I will have to dig them up and find the serials. I know I have 2 or 3 easily accessible . The 1200xl is still to me one of the best looking ever full-production computers. 1 Quote Link to comment Share on other sites More sharing options...
JGRAHAM2 Posted January 22, 2022 Share Posted January 22, 2022 Here are my 3. The first 2 are stock, the last, 51438 has super video, RAMBO 256 and 32 in 1 OS. 1 Quote Link to comment Share on other sites More sharing options...
gosub_9 Posted January 22, 2022 Share Posted January 22, 2022 SN: 83S DA 017803 133 Owner: gosub_9 Location: USA We are the original owners. 2 Quote Link to comment Share on other sites More sharing options...
+kheller2 Posted January 22, 2022 Author Share Posted January 22, 2022 We are up to 561 units now. This is great! (But sad when you consider there are probably 110,250 Units and this brings us to 0.5% registered) Quote Link to comment Share on other sites More sharing options...
leech Posted January 23, 2022 Share Posted January 23, 2022 16 minutes ago, kheller2 said: We are up to 561 units now. This is great! (But sad when you consider there are probably 110,250 Units and this brings us to 0.5% registered) Pretty sure both of mine are already added (I know I did one at least). Wonder how many have been tossed over the years because the keyboard stopped working... which is a fairly easy fix. 1 Quote Link to comment Share on other sites More sharing options...
gosub_9 Posted January 23, 2022 Share Posted January 23, 2022 4 hours ago, leech said: Pretty sure both of mine are already added (I know I did one at least). Wonder how many have been tossed over the years because the keyboard stopped working... which is a fairly easy fix. hurts to even think of it. Quote Link to comment Share on other sites More sharing options...
BrianUsher Posted January 24, 2022 Share Posted January 24, 2022 Here is mine: Love the look of the 1200XL as well as the feel of its keyboard (when it works). I did most of my gaming and other activity on my 800XL (that I still have), but I just love the design and quirkiness of the 1200XL. Paid $25 for it along with a 1050 and 1030, all working perfectly, and tons of software back in 2001 and I thought I overpaid. I miss those days! 1 Quote Link to comment Share on other sites More sharing options...
Brockmd Posted February 8, 2022 Share Posted February 8, 2022 I just bought mine recently. 2 Quote Link to comment Share on other sites More sharing options...
Brockmd Posted February 8, 2022 Share Posted February 8, 2022 Did Atari plan on using a different OS? Quote Link to comment Share on other sites More sharing options...
ACML Posted February 8, 2022 Share Posted February 8, 2022 (edited) 2 hours ago, Brockmd said: Did Atari plan on using a different OS? For some reason Atari designed the 1200XL motherboard to be able to accept either 24 or 28 pin OS chips. The choice is controlled by the "zero ohm" resistor/jumpers W6-W9 and W11-W13. The 24 pin configuration (pictured) has W6-W9 with zero ohm jumpers and W11-W13 are open. To utilize a 28 pin EPROM, you configure to the opposite (W6-W9 open and W11-W13 with zero ohm jumpers). I have no idea what Atari had been thinking for future growth, only speculation. Back to your original question, yes, there was an updated version of the OS (Rev 11) that fixed many incompatibility issues, but it also used 24 pin ROMs. The shipped version (Rev 10) was included with all production versions. Most motherboards I've seen have 24 pin sockets, but there were a good number released with 28 pin sockets like yours. The fact that Atari went ahead and produced many Rev 11 ROMs makes me wonder was it just a natural "cut-in" they would implement in future production, which never happened, or was it to serve as a "recall" type fix. No one knows. It's easy to distinguish which version you have: 1) CO60616A and CO60617A are Rev 10 and CO60616B and CO60617B are Rev 11 2) At boot up, the Rev 11 ATARI splash screen has the little trademark (R) next to the "I" in Atari that Rev 10 lacks By replacing Rev 10 with Rev 11, you essentially fix most compatibility issues and end up with an OS that is +99% similar to the 600/800XL OS. It is highly recommended. Best Electronics sells the Rev 11 ROMs. If you have access to an EPROM burner, you could burn Rev 11 or even the 600/800XL OS on 28 pin 2764 EPROMs and configure the W6-W13 jumpers to accept 28 pin EPROMs. P.S. When I refer to "compatibility", I mean with respect to the 600/800XL. Both Rev 10 and 11 have the same original 400/800 OSb issues. Funny how back in the day, the 1200XL was not compatible with OSb, but today with so many more XL and XEs in the world, the 400/800 OSb is now considered the one with compatibility problems. Edited February 8, 2022 by ACML Quote Link to comment Share on other sites More sharing options...
+bf2k+ Posted February 9, 2022 Share Posted February 9, 2022 On 5/17/2007 at 11:14 PM, kheller2 said: USA 1983 08 21-Feb-83 83S DA 003385 083 bf2k+ USA 1983 11 14-Mar-83 83S DA 011065 113 bf2k+ I recently sold both of these so should my name be removed from the list? Quote Link to comment Share on other sites More sharing options...
Kr0tki Posted February 9, 2022 Share Posted February 9, 2022 21 hours ago, ACML said: The fact that Atari went ahead and produced many Rev 11 ROMs makes me wonder was it just a natural "cut-in" they would implement in future production, which never happened, or was it to serve as a "recall" type fix. What do you mean by "many"? Is there any data on how many Rev. 11 ROMs were made? Rev. 11 definitely served as a recall fix - see Tech Tip 18A in the Atari 1200XL Field Service Manual. 21 hours ago, ACML said: Both Rev 10 and 11 have the same original 400/800 OSb issues. This is not strictly true. Rev. 11 OS contains changes done specifically to make it more compatible with the 400/800 OS. Quote Link to comment Share on other sites More sharing options...
+kheller2 Posted February 10, 2022 Author Share Posted February 10, 2022 20 hours ago, bf2k+ said: I recently sold both of these so should my name be removed from the list? They are from the master list. I will update the first post here sometime. Quote Link to comment Share on other sites More sharing options...
ACML Posted February 10, 2022 Share Posted February 10, 2022 5 hours ago, Kr0tki said: What do you mean by "many"? Is there any data on how many Rev. 11 ROMs were made? Rev. 11 definitely served as a recall fix - see Tech Tip 18A in the Atari 1200XL Field Service Manual. This is not strictly true. Rev. 11 OS contains changes done specifically to make it more compatible with the 400/800 OS. Best Electronics has many for sale. Rev 11 appears to be the basis for the 600/800XL OS. My recollection is that those titles that would not run on Rev 10, also had issues with Rev 11. More compatible to me is more compatible with the XL/XE line. Quote Link to comment Share on other sites More sharing options...
Tillek Posted February 10, 2022 Share Posted February 10, 2022 2 hours ago, kheller2 said: They are from the master list. I will update the first post here sometime. I ended up with one of them. Not sure which though. Quote Link to comment Share on other sites More sharing options...
ACML Posted February 12, 2022 Share Posted February 12, 2022 On 2/9/2022 at 7:05 PM, ACML said: Rev 11 appears to be the basis for the 600/800XL OS. My recollection is that those titles that would not run on Rev 10, also had issues with Rev 11. More compatible to me is more compatible with the XL/XE line. To amend to this statement, I went back out of curiosity and found that Rev 11 still could not load 5 of the 6 OSb programs I had available. I stand by my opinion that Rev 11 still has most of the OSb incompatibilities as the original Rev 10 OS. The Rev 11 improvements solved other problems and appears to serve as the baseline for the 600/800XL OS when they added support for the PBI and ditched the ATARI splash logo. I actually run the 600/800XL in my 1200XLs. Atari left all the 1200XL advanced keyboard (F1-F4) and LED (L1 & L2) functionality in the 600/800XL OS so you get 100% XL compatibility with no lose of 1200XL specific function. Quote Link to comment Share on other sites More sharing options...
+kheller2 Posted February 15, 2022 Author Share Posted February 15, 2022 What amazes me this week are the amount of 1200XLs on eBay ... and the amount of 1200XLs on eBay that had serials not on the list. 569 Units total now. 1 Quote Link to comment Share on other sites More sharing options...
Beeblebrox Posted March 23, 2022 Share Posted March 23, 2022 My latest A8, a 1200XL in fantastic condition all the way from the States, (ergo currently NTSC). Will be PAL soon enough. Serial 72R DA 13829 213: More info here 1 Quote Link to comment Share on other sites More sharing options...
Beeblebrox Posted March 24, 2022 Share Posted March 24, 2022 21 hours ago, Beeblebrox said: My latest A8, a 1200XL in fantastic condition all the way from the States, (ergo currently NTSC). Will be PAL soon enough. Serial 72R DA 13829 213: More info here @BrianUsher hey... Looking at your 1200's serial number it looks ours were on the same product line, with yours At 13834 and mine at 13829 ? (maan I am such a nerd!!) 1 Quote Link to comment Share on other sites More sharing options...
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