Started by micro, February 01, 2015, 02:50:37 AM
Quote from: MockyLock on May 16, 2015, 03:18:41 AMHey Unseen, are you the one from the famous gcVideo ?
Quote from: microHowever, switching frequencies (50/60 Hz) with Sega Saturn and the DFO installed there's a 50% chance the saturn will freeze caused by the complex clock generation and distribution system of the Saturn.
Quote from: Druid II...the three pal/ntsc selection pins are interlinked differently depending on motherboard. There are three of them, the PLL pin 1 (main oscillator selection), VDP2 pin 79 (50/60hz output), and CXA1645 pin... uh,7 I think (PAL/NTSC color encoding). Only relevant if you do a 50/60 mod and end up with a rolling image, in which case the PLL is switched to the wrong frequency mode.[the trace connections differ] from model to model. NTSC VA0-5 have them all interlinked, so you switch the crystal, switch a jumper, and it's done. PAL VA7 and VA9 have them like that as well. NTSC VA6+ and PAL VA13 use a different PLL, only the video encoder and the VDP2 are interlinked. PAL VA0 and VA3/5 have them separated fully and have some of them on their own extra jumpers, PAL VA1 is the same but the VDP2 and PLL are still interlinked, a snafu in design I guess, so you can't even use the SW4 switch on the back without cutting the trace leading to PLL pin 1.
QuoteIf I understand correctly, the DFO just handles frequency, so I would still need a switch (or switchless mod) to get region locked games working.
QuoteLanguage switch I assume wouldn't be a problem. But if I want to play a region locked US game on my PAL console, I would also have to connect chip leg 46 to 5V (NTSC), which would normally result in the game running at 60hz.
Quote from: bmp02 on May 15, 2019, 12:15:34 AMApologies for the delayed response. Somehow I assumed I'd get a notification email or something.
Quote from: bmp02 on May 15, 2019, 12:15:34 AMApologies for the delayed response. Somehow I assumed I'd get a notification email or something.Anyway, I assume I understand it now. Somehow I had this weird idea that the 50/60hz switch (leg 46 of the 315- chip) would do something to the oscillator output frequency.I have quickly soldered a language and frequency switch yesterday, which works. Now patiently waiting for all the dfo parts to come in Thanks for your reply.
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Quote from: Segasonicfan on May 15, 2019, 02:37:52 PMyou mean it doesn't default to ultra-spam mode? thats a forum first!
Quote from: bmp02 on May 21, 2019, 10:57:58 PMWell I've found the assemblergames topic mentioned earlier, that helped me to get some directions.I understand I do need another programmer, with Usbtinyavr preferred over Usbasp, because apparantly that last one has the risk of another programmer needed to program the programmer for my programmer (I have once watched Inception and felt the same).I'm not sure if the pin headers that come with the Tinyavr can just be plugged into the programmer, or if I need something else to make that happen. I'll order some extra headers in case I need any (and hoping to get the correct size).Guess I'll have to try to find out how to use it when I get it (and what to do with those "fuse bytes" mentioned?).This is quite a trip.
QuoteIt's important to set the V_Target switch on the programmer hardware right. If you have the DFO sitting on your table and you want to program it, set V_Target to on. The LED should start to shine red.If you want to program a DFO that's already installed in a system (let's say in a Megadrive for example), then turn V_Target off. Instead turn on the Megadrive itself. It will power the DFO.If you mess this up you can damage your console, the programmer and even your PC!