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DanBoris

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About DanBoris

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  1. This sort of reminds me of the algorithm the Telengard uses to generate it's maze. It uses a algorithm based on your current location in the maze and three hard coded constants. They must have had to hand tune those constants until they got acceptable mazes. You can read the details here: http://atarihq.com/danb/Telengard.shtml
  2. This sounds great, Atari has often been under-represented at VCF East. I will definitly have to get there this year.
  3. Yeah, that's how I learned about this, I saw the trailer for the movie and it lead me down this rabbit hole.
  4. I hate to bump and old thread but I just stumbled across the answer to this question. Looks like JoseQ went into film-making as actor, director, writer, producer, etc. https://www.imdb.com/name/nm5256812/?ref_=fn_al_nm_1 I was friends with him back in my emulator author days and he used to host a web site for me. When I saw the name on IMDB I figured it was unlikely the same person, but I am connected to him on LinkedIn and his photo there matches one of his resume photos.. http://www.lmtalent.com/page/texas_talent?talentid=2160&name=Jose%20Quinones&
  5. If you want to talk about intermssions, my favorite was the ones in Astrochase. Don't know if I ever saw all of them.
  6. ANTIC sends the Halt when it needs to read from memory. These memory reads happen at specific times during each scanline. As the documentation I linked to shows, the exact pattern on the memory reads is dependent on the scanline graphics mode and other configuration settings.
  7. I would assume the address bus would be in input mode whenever it isn't halting the processor since it needs to decode the bus to check for register writes. As for when it activates Halt, check out the Altirra Hardware Reference which has a lot of information about ANTIC timing. http://www.virtualdub.org/downloads/Altirra%20Hardware%20Reference%20Manual.pdf
  8. The address bus on the ANTIC is used for both input and output, so when it's not doing output there would be internal circuitry that would stop if from driving the bus so it can read from it.
  9. Probably because it's also wrong in the pin list in the official Atari documentation, but it is correct in the pin characteristics list and the GTIA internal schematics show it as an input.
  10. Yeah, the 400 and 800 have the tri-state buffers. The XL and later systems have a special version of the 6502 called the "Sally" which has the tri-state buffers built in.
  11. If they are both doing the same thing, why would you want two of them? Not sure what you goal is here?
  12. In theory you could probably have two ANTICs on the bus at the same time but they would always have to be doing exactly the same thing. You could probably come up with some logic to address one or the other, but the problem is when they go to read from memory to fetch video data. Unless they were doing exactly the same thing, they would push different addresses onto the bus which would totally mess things up. You are correct that the ANTIC doesn't write to memory, it only reads.
  13. The expansion port on the 7800 only brings out video signals and a couple misc control signals from the CPU so there is no way to use it for interfacing. The joystick ports on the other hand can be configured for either input or output so in theory you could connect two machines through their second controller ports.
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