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jindroush

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Posts posted by jindroush

  3. Posted

    Hi,

     

    I've got SDX 4.22 with manual for sale.

    Also Parrot sound digitizer with disk, CD turbo interface, turbo cartridges

     

    MIB Powerstar from Pandora, also some disk adventure games: HHtG, Wishbringer, Suspect, Zork I, Silicon Dreams, Ogre, Transylvania and other disk games, some other cartridge games as well.

     

    I'm located in Europe.

     

    Please send your questions/offers directly to jindroush AT seznam D0t cz

  5. Posted

    Gunstar: No, the audio output of cd is routed by a stereo cable to the interface which has left/right switch for track selection and SIO plug for the output. I don't know why the guy didn't display it there. The cartridge is just the 2k loader, nothing else.

     

    Clint: I'll can make it for you for $60, as I said :twisted: 8) :D

  6. Posted

    Why should it be fake? I have the device and on my page there's a schematic.

     

    There are 99 stereo tracks on the cd. Each gets 4 programs * 2 (two tracks).

     

    You have to load turbo loader from cassette/disk/cartridge, it then loads 'Tornado' menu in high-speed turbo from cd. You then have to select the program, while atari is loading on 10kbps using Pokey. The 4 programs do load in one long block, if you want program 4, all the three previous programs are loaded to memory anyway, but only 4th gets executed (rolling buffer).

     

    The price is ridiculous. Or, better said, I'm going to build them too :D

  12. Posted

    HIP mode relies on certain GTIA+Antic bug so it works only in graphics (not charset!) mode.

     

    In bad mood today... :twisted:

     

    1) Why do you call that bug? It's not a bug. It's a quirk, undocumented behavior or whatever. Bug is when it contradicts the docs. This does not.

     

    2) GTIA modes are not graphics modes. GTIA modes are tweaks or better said filters put above any graphics/text mode you wish. As gr.0 and gr.8 (underlying mode for gr.9,10,11) are same from 'pixel' point of view, there shouldn't be any problem with that. The only problem remains in timing of PRIOR writes.

  15. Posted

    This also calls into question the value of 320 modes.  I wonder why GCC included them.

     

    There's a option to turn off the color burst for hi-res modes. Then it should display as pure 320 b&w picture without any artifacting. (At least I understand the docs that way).

  20. Posted

    Aren't 3 cycle nops just void reads from the memory?

     

    Well' date=' they're instructions that don't have any effect. Look at the undocumented opcodes, and you'll see there are a lot of them with different clock lengths.

    [/quote']

     

    Yeah, I've seen the docs. But _IF_ they're what I'm talking about, i.e. nop instruction with memory access, they may be used for an I/O triggering also. (Instead of STA WSYNC, for example).

  21. Posted

    NOPs take indeed 2 cycles' date=' but when the screen is being drawed you still have the {first half} - {second half} problem. In the second half every other cycle is stolen by graphics DMA, but a NOP only needs 1 cycle for memory access (Opcode fetch) as it doesn't do anything else with the memory. So the 2nd NOP cycle is executed by the 6502 when Antic uses memory. That's why you can move a register-change exactly 1 gr.0 char- width left or right (when drawing the second half).[/quote']

     

    Where did you get that info? I still think that Antic stops the CPU completely, so if the second cycle of an instruction is pending, it's simply frozen by Antic.

     

    The undocumented 3cycle NOP

     

    Aren't 3 cycle nops just void reads from the memory?

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