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DanBoris

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About DanBoris

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  1. This sounds great, Atari has often been under-represented at VCF East. I will definitly have to get there this year.
  2. Yeah, that's how I learned about this, I saw the trailer for the movie and it lead me down this rabbit hole.
  3. 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&
  4. If you want to talk about intermssions, my favorite was the ones in Astrochase. Don't know if I ever saw all of them.
  5. 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.
  6. 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
  7. 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.
  8. 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.
  9. 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.
  10. If they are both doing the same thing, why would you want two of them? Not sure what you goal is here?
  11. 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.
  12. 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.
  13. Why do you feel the team needs to "hide" behind anything? Preserving ROMS is a totally different thing that comes with significant legal challenges, not something a team of volunteer developers want's to deal with. MAME does the next best thing, and provides a tool that can verify that the ROMS you have found are what was in the original machine. I got involved in the MAME development close to 20 years ago, and I have seen these type of "attacks" on the project since day one, but I can never understand people who attack the project because it doesn't work they way they want it to. MAME is written by a group of hobbyists that do it because they enjoy doing it, and they do what they want to do. If people don't like it, they don't have to use it, or they can go off an try to write something better (which has happened in the past). Constructive criticisms is fine, but statements like "they're doing some bullshit development system" and "Some idiot with "pet-project" mentality" are by no means constructive.
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