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Found 6 results

  1. I managed to get the atari 800 I had when I was a kid from my mother's house, after she passed away. It had a bad space bar from way back, and my little brother mangled the little metal fingers under the key trying to fix it. Long story short, I replaced the keyboard with a new one. It worked great for about 10 minutes, then suddenly no keys are working. Putting the old keyboard back in didn't clear up the problem, so I have to assume it's something on the motherboard. After doing a bit of research, it seems like the Antic chip might be the issue, as absolutely none of the keys work, but I don't know how to diagnose it for sure. Further, even if I decided to buy one of those fast disappearing chips to replace it with, what caused it to go out in the first place? It seems rather coincidental that it goes out 10 minutes after replacing the keyboard, after surviving for 30 years with a broken space bar, and a year of use since I got it back, using it with the broken space bar. I'd like some ideas on what to test to maybe figure out why it would have gone out. I appreciate any help someone can give me.
  2. Does anyone have or know of a complete list of ANTIC/GTIA graphics modes, in one place, to help developers make the right choice for a particular project? One that includes not only the "originals" (as in http://gury.atari8.info/ref/graphics_modes.php for example) but also the special ones discovered over time such as APAC, HIP, RIP, TIP and whatever else. Ideally including which color registers are used, limitations, tips, and any other pros and cons of each mode.
  3. I recently got my old first computer out of storage. It's a 130xe and it's been dead for 30 years, and I wanted to repair it. It shows a solid black screen when running. I ran a logic analyzer across a variety of pins on the system to see what seemed to be working. The address and data lines across all ram chips, the sally, antic, and gtia all seem to be good. The BASIC chip also has solid connectivity to these lines. The OS Rom chip was socketed by the former owner of the machine (I bought it in 1986 used,) and most of the pins on this socket aren't making contact to the address and data lines. This is likely the cause of the fault in the system. The socket doesn't seem to be gripping the pins very well and the chip comes out a bit too easily. But the other thing I found is that P5 on ANTIC, which goes to P20 on GTIA, and P23 on GTIA are all solid logic low, when the Sam's guide says they should be going back and forth between low and high. Most of the other pin the wave form is provided for seem to have good signals on the analyzer. (I don't have a scope to verify the waveforms though.) Would the OS chip being disconnected cause it to be a solid black screen all on its own, or could there be some other problems with the GTIA and ANTIC? I'm going to be ordering a new socket for that (and maybe a new ROM, just to be safe,) and wanted to order any other chips that could be bad at the same time so I don't need to wait around twice if the first thing doesn't fix it. (I already have sockets for the RAM chips, and new ram chips on the way, since I figured this is a common failure mode with a MT ram based 130xe's.)
  4. What are your top 10 favorite Atari BASIC games from magazine listings? This can include games that use machine language subroutines. If you can include what magazine each game came from, that would be helpful too.
  5. Hello everyone, I've made a series of 4 YouTube videos describing in detail the conceptual work, and the creation of words to implement an ANTIC disassembler tool in FORTH to compliment the ANTIC assembler that I wrote. This basically demonstrates how FORTH can quickly be used to make useful tools that can be intermingled with the development of programs in FORTH so that you don't have to load entire other programs to get stuff done, but rather just flow from one vocabulary of words to the next. Let me know what you guys, think. -Thom
  6. I have 27 original Antic floppies dated from 1987 through 1990. (There is one copy in there too, as a 28th). Most of them are NOT written on like the example on the left is. The two shown are the only two with Antic sleeves, the rest are blank or other styles. Is there any value in these? If they're literally just worth the cost of shipping, I'll just keep them, but if not, please make an offer of cash or trade. Just putting feelers out there. Thanks!
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