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CannibalCat

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Posts posted by CannibalCat

    Minimum EPROM speed for CV?

    in ColecoVision Programming

    Posted

    The old EPROM used are very slow, typically 200ns.

     

    I suspect more of a RAM address setup problem. I've had the experience that if you keep CE set some RAM memories show transitory "trash" in reading. I would put CE and OE together.

     

    Also if your RAM is fully CMOS maybe you would need pull up. But I don't remember if in inputs or outputs to account for TTL to CMOS different voltages for logical 1.

     

    nanochess... thank you, your advice pointed me in the right direction... problem solved!

    • Like 1

    Minimum EPROM speed for CV?

    in ColecoVision Programming

    Posted

    Hi, was seeing odd artifacts with an EPROM emulator unit I'm using and was wondering if the speed of memory in it (read time) was a factor, the static RAM is at 70ns. I have a burned EPROM of the same code which has a speed of 45ns and works fine, is there a minimum access speed for the CV?

     

    Thanks,

    Rich

    Arcade ports?

    in ColecoVision / Adam

    Posted

    I have a Mame arcade machine at home, and it's true that some games are way better than on the Colecovision (Time Pilot, Popeye, Donkey Kong jr., etc). But, I think the following are actually much better on the Colecovision:

     

    Gorf

    Frenzy

    Carnival

    Omega Race

    Pepper II

    Lady Bug

     

    Especially Gorf and Frenzy--they both look and play better and are more fun. Even with the missing level, Gorf on the Colecovision is the better game compared with the arcade. I also think that Space Invaders on the Atari 2600 is so much better than the arcade version ;)

     

    There is no way that Gorf or Omega Race are better (or even good) on CV. They are both horrible ports actually, with bad AI and graphics compared to the arcade. Gorf on CV doesn't even play like the arcade. Omega Race on VIC-20 is better than the arcade version, and even Gorf on the VIC is better than the CV one.

    SGM...I have to wonder how this guy has twelve

    in ColecoVision / Adam

    Posted

    If they are still in current production I would only pay what they are selling for from opcode. Any higher than that is stupid. If they were no longer made thats different.

     

    Well, that's assuming you can get one (or wait extremely long for one)... for me, I snagged one at 2x the normal price off EBay because I wanted one to use now, before I die, not getting any younger :)

    Finally got one! But got one question.

    in ColecoVision / Adam

    Posted

     

    And for $34 more + the cost of shipping you could've had the entire CV library plus homebrew games.

     

    Some people (including myself) prefer to have original carts, not SD carts (I've had them, and it's not the same to me). Let him get real carts, no need for a SD cart. He would be better off using that money to buy a SGM or something.

    • Like 2

    Colecovision Auction Watch

    in ColecoVision / Adam

    Posted

    HI there, I'm new to AtariAge but not to ColecoVision. My entire collection was stolen in the 90's and I had some insanely rare games. So I decided to try to rebuild finally after 20 some-odd years.

     

    This seems like good time for me to jump in and ask this question since it's currently being discussed: what's the deal with the home-brew ColecoVision scene? It seems like the carts are totally overpriced. I actually do have an SGM that was given to me a few years ago by Eduardo (long story), but I still don't have a single game for it since the carts are outrageously priced it seems. I am trying to figure out why. Most of what I see is between $200-$300.

     

    Just trying to catch up on CV Collecting culture. Anyone that would like to explain it to me, I'd be deeply grateful.

     

    Thanks!

    Jason

    Long story short, don't look for them on EBay... a bunch of shady dudes selling them (and bootlegs of them) on there. Buy direct from the authors.

    Smooth scrolling like Defender, Nova Blast or Victory... how?

    in ColecoVision Programming

    Posted

    I don't know, but I assume they did it the same as I did for my games in the Search for the Stolen Crown Jewels series:

     

    Only a few rows are scrolled (for me, depending on the game uo to 4). Nova Blast only needs to scroll the cliffs at the bottom row, and 2 or 3 rows for the islands. SCJ games have two rows on the bottom and up to 2 rows of clouds in the sky. All other movement is done via sprites.

    For those rows, you stole each tile multiple times, depending on how smooth the scrolling will be, you have 4 or 8 shifted versions shifted by 2 or 1 pixels each. Then you quickly overwrite the VRAM data for the 3 or 4 rows in your game main loop. You only need to write 32 bytes of VRAM per row.

     

    Philipp

    Thanks for the insight, I figured that was what Nova Blast was doing... Defender perplexes me a bit more but I guess it's more of the same.

    rarest a8 carts (no prototypes )

    in Atari 8-Bit Computers

    Posted

     

     

    No, not heat. Light. VERY bright incandescent light onto the EEPROM window. The heat was just a very unfortunate byproduct. It got placed in a little drawer. You had to take the board out of the housing IIRC. That part is vague in my head.

     

    That would be UV light then... but why was it "hot"?

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