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poobah

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Posts posted by poobah

    Carrier Board for Atari Falcon

    in Atari ST/TT/Falcon Computers

    Posted

     

    I think I've identified the problem. The external power block I was using to power the Pico wasn't pushing any 5V into the system. I have one now that should work, but it terminates into a molex drive connector. I'll cut it and splice it onto a round pin connector for the Pico.

     

    Pico's usually get fed +12v through the round connector. The other connectors are outputs.

    Carrier Board for Atari Falcon

    in Atari ST/TT/Falcon Computers

    Posted

     

    But I connected three of the ground pins from the ATX adapter to the three ground pins on the Falcon motherboard header. And remember, I have a full-sized ATX power supply that is working just fine with this. Does that all sound like I have done the needful?

     

    To start an ATX power supply, you have to short pin 14 to ground (pin 15, 16 and 17 are all grounds). Both of these pins are on the power supply side, has nothing to do with the falcon. Normally you connect a momentary contact switch across 14 and 15.

    Carrier Board for Atari Falcon

    in Atari ST/TT/Falcon Computers

    Posted

    I cut the power connector from the Falcon and spliced all of the lines to the proper ones on a female ATX power connector. I plugged the Pico into this the same way that I plugged the male connector from a standard ATX power supply. I trust both power supplies to ground as they normally must. Did I miss something?

    ATX power supplies need a wire grounded to start up. Look here: http://www.instructables.com/id/How-to-power-up-an-ATX-Power-Supply-without-a-PC/

    Another World Jaguar Pre-Order

    in Atari Jaguar

    Posted

     

    Lol. Read the last few pages of the thread, the email to get on the list has been put up a few times..

     

    Actually, I did. Most of it is posts of the "I sent an email and never heard anything back what do I do now" variety.

    Hence, asking for current process to avoid the same issue.

    Catbox/Scatbox VGA to HDTV

    in Atari Jaguar

    Posted

    Skipping scan-lines is a generalization and not technically true, all 480i scan-lines are drawn 240 and then a second pass at 240, but every other scan-line is black, or no data (like just all 0's) with a 240p signal on a SD 480i TV/monitor. A 480i signal does 480 lines, but as you stated does 240 on odd lines, and then a second of 240 on the even lines but every line has it's own data so no lines are left black or "no data."

     

    Not to flog a dead horse, but I didn't see anyone fix this...

     

    "Back in the day" our 15 kHz display devices expected more or less a 30 Hz interlaced NTSC-like signal. The odd frames would display 262(ish) odd numbered scan lines (1,3,5,...) The even frames would display the even numbered scan lines physically interleaved with the prior odd lines (2,4,6,...), the phosphorous in the display and the persistence of vision in our brains combined the two interlaced frames into a single 525 scan line frame at 30 Hz.

     

    However, our 15kHz devices of the day (ST's, A8s, etc) only had 240 (or so) lines of data, so they simply output the same frame twice, and didn't include the burst telling the display to switch between odd and even frames, which caused the display device to paint the the odd and even frames on top of each other, rather than interleaving the scan lines, giving a 60 Hz frame rate with half the vertical resolution. On CRT's you get the 'blank scan line' effect, because the electron gun never physically paints the 'even' parts of the screen!

    When you move to an LCD, doubler, or upscaler, each scan line gets repeated, 'filling in' the 'blank' even scan lines with a copy of the odd ones, resulting in an image where all the pixels are painted twice as high, with no vertical gaps. Whether this is an improvement is very subjective, however, it is substantially different from "no data".

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