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khryssun

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Posts posted by khryssun

  3. Posted

    Hello Albert,

     

    Atari Age will be definitely the best and most comprehensive Atari web site.

     

    Do you consider to put the scanned yars' revenge comic book , "The Qotile Ultimatum" online ?

     

    I'am very curious about this comic book cause it wasn't packaged with the Yars' revenge cartridge in France .

     

    2 years ago I've ordered some cartrides and this comic book at the Jerry G. site (I think it was that name) but I've never received my package and lost my 30$

  4. Posted

    Thanks for this GREAT info

     

    I'm impatient to discover all those manuals I've have never see.

     

    Just Love the artwork ATARI done with their manuals.

     

    They made pieces of art

  8. Posted

    What you are calling "symbols" are bytes. Concerning ROM files, these bytes are the Opcodes (Numbers assigned to CPU instructions) and Datas.

     

    One wise man said "Don't just give a fish to a hungry man, learn him to fish"

     

    So, I won't just give you a Conversion Table but the way to convert any Hex code to Decimal (may be transposed to any Base conversion).

     

    Minimal Conversion Table :

     

    Dec Hex Dec Hex

    0 0 8 8

    1 1 9 9

    2 2 10 A

    3 3 11 B

    4 4 12 C

    5 5 13 D

    6 6 14 E

    7 7 15 F

     

     

    "Hex Structure" :

     

    Value ... 16^3 16^2 16^1 Unit

    multiplicator *4096 *256 *16 +Unit

    Number Position n4 n3 n2 n1

     

    an Example of conversion :

    F C A

     

    FCA = 15 * 256 ( 3840)

    + 12 * 16 ( + 192)

    + 10 ( + 10)

    --------

    = 4042

     

     

    You'll just have to code the algorithm for your Basic Program using these infos.

     

    hope this help

  9. Posted

    quote
    However, when I went to test the cartridges out, the Space Invaders one didn't seem to work

     

    Is there something displayed or the screen stay blank ?

     

    did all your consoles use the same video standard ? (NTSC, PAL, SECAM) ?

     

    Have you a NTSC or a PAL cartridge of SPACE INVADERS ? (I Don't think a SECAM Version of Space Invaders Exists)

  11. Posted

    quote
     the numbers are not solid. They are made up of closely spaced horizontal lines. Hope this helps!

     

    YES ! This helps a lot !!!

     

    Thank you very much a for this complete description. I think, that's the cause of the color alteration with SECAM systems.

     

    Anyone noticed the same "not solid" effect in other games ?

     

    Thanks again

  13. Posted

    It seems my last post about NTSC / PAL /SECAM video hardware compatibility was lost...

     

    Is there a person with a NTSC VCS 2600 and a NTSC SPACE INVADERS Cartridge rather kind to help me ?

     

    For emulation support, I need the following information :

     

    How many colors are used by the VCS (a real one, not emulators) to display each score player ?

    1, 2 or more ?

     

    //for info :

    //PAL systems display each score player using 1 color

    //SECAM system use 2 colors.

     

    Thanks

  14. Posted

    Step by Step....

     

    Thanks a lot to Eckhard Stolberg for the info about the PAL system.

     

    About the number of colors used to display each score player in Space Invaders (Using a REAL VCS - not emulators):

    - 1 color in PAL

    - 2 colors in SECAM (With a PAL Cart)

     

    Anyone of you guys with a NTSC system may test Space Invaders and tell me the number of colors used to display each score player ?

  17. Posted

    While testing carts to define the SECAM palette, I've noticed a strange thing with my PAL cartrigde of Space Invaders.

     

    I've put a screen capture here : http://www.khryssun.cjb.net/invaders.html

     

     

    Each score is displayed with 2 colors.

    But the Dark Green color used to display the score of the 2nd player doesn't match with the regular colors as they are defined in the STELLA manual(for SECAM system).

     

    In fact, among the cartridges I've tested, it's the only one which uses thas color (the other ones are using the 8 regular colors palette) !

     

    Refering to the Stella Manual, I've found this additional "Dark Green" color quite mysterious.

     

    At first I've thought it was an interference problem due to the refresh rate/Capture interference of my capure video cart, so I've plugged my VCS into the TV to get a better display.

    The TV picture was much more better and confirm this Dark Green color.

     

    Then I've noticed a 1 pixel displace in the score numbers.

    This seems to be the cause of the color alteration.

     

    So, I 'am wondering if this color is a native color or the currupted original green color due to some tricky video operations.

     

    anyway, the color display is perfect with no flicker effects.

     

    I've check space invaders with emulators (Z26 and PCAE) then I've been surprised to discover that each score is display with 1 color only instead of 2.

     

    Is the score displayed with a real VCS is monochrome with NTSC or PAL systems ?

    - if yes, the emulation need to be improved.

    - if no, are the colors used to display the scores are regular ones ?

  18. Posted

    I plan to build an EPROM 4k cart.

     

    I don't want to build a multicart such as Bob Colbert's one with dipswitches.

     

    For my first attempt I'd like to work on a very elementary circuit.

     

    I see the stuff like this :

    - Build a simple circuit with a 2732 EPROM and a 7404 Invertor.

     

    Anyone got an EPROM cart and may to help me ?

     

    Furthermore, If you have some EPROM cart or Prototype EPROM Cart (4Ko only) out of their box and a SCANNER please email me a 2 sided scan (scale 1:1 - not a photo). This may help.

     

    [email protected]

     

    I wondering about on thing :

     

    Is it possible to replace the 2732 EPROM with an EEPROM ?

     

    Thanks

  19. Posted

    Glad to Help

     

    quote
    if you have any of the misterious SECAM only games....  

     

    I'd like to have these ones.... unfortunately I own only PAL carts for now

     

    however, I (still) hope to find some in a flea market.....

  21. Posted

    Hey bob, I'm using almost the same technique.... that improve the speed ++ and allow to get great scores easely.

     

    scooterb23, I won't blame you.... cause I love Pac Man too (but my eyes don't like the twinkle effect)

     

    My other favorites games are :

     

    - Haunted House

    - Defender

    - Yar's revenge

    - Star Wars : Empire strikes back (uh, I broke a joystick with that one !)

    - Star Raiders

    - Adventure

    - Vanguard

    - E.T. (YES it's possible - got lot of fun with that game - just need to be familiar with the pit problem)

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