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andym00
Registered: Jun 2009
Posts: 44 |
Ultimax unleashed..
Well, someone did what I've been wanting to do for some time.. Driving VIC fetches from external memory, and stuffing register writes over the bus.. Hooray for Ultimax mode I guess :)
Always wanted to build something like this, but kudos to Laurent for acutally getting there..
https://www.youtube.com/watch?v=yy4Gr11EXHM
He's got a few videos up of it in action.. Nothing ultra crazy, but proof it's all working..
https://www.youtube.com/channel/UCDfSVxlHK9AJHPRCoGqDYZQ |
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knue
Registered: Dec 2012
Posts: 37 |
ic, thanks :) |
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Martin Piper
Registered: Nov 2007
Posts: 634 |
And the ROM doesn't have to be a ROM, it can be any signal from any source. |
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Krill
Registered: Apr 2002
Posts: 2839 |
Quoting Martin PiperAnd the ROM doesn't have to be a ROM, it can be any signal from any source. Thought that as well, but technically, VIC always only reads data (except for RAM refresh). =)
Then again, the CPU may also write to external addresses (if not permanently halted by perpetual DMA).
Anyhow, with VIC reading external data, one could make something that would convert whatever video signal to VIC bitmap/characters (with FLI and sprites and whatnot) at full 50 Hz refresh rate. Kinda lame, but kinda cool as well. View random videos through a realthing VIC filter. |
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Golara
Account closed
Registered: Jan 2018
Posts: 212 |
Quote: Quoting Martin PiperAnd the ROM doesn't have to be a ROM, it can be any signal from any source. Thought that as well, but technically, VIC always only reads data (except for RAM refresh). =)
Then again, the CPU may also write to external addresses (if not permanently halted by perpetual DMA).
Anyhow, with VIC reading external data, one could make something that would convert whatever video signal to VIC bitmap/characters (with FLI and sprites and whatnot) at full 50 Hz refresh rate. Kinda lame, but kinda cool as well. View random videos through a realthing VIC filter.
I'd rather just take out the VIC chip and build the rest of the system around it. The dram refresh feature can be just ignored, right ? |
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Krill
Registered: Apr 2002
Posts: 2839 |
Plugging in a cartridge is way easier and less likely to kill a precious C-64 or VIC itself. =)
And i think running the VIC in a non-native environment comes with a whole new set of problems, including the analogue sort. |
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Golara
Account closed
Registered: Jan 2018
Posts: 212 |
Quote: Plugging in a cartridge is way easier and less likely to kill a precious C-64 or VIC itself. =)
And i think running the VIC in a non-native environment comes with a whole new set of problems, including the analogue sort.
I wish the day was longer than 24 hours, there's so much stuff I'd love to try, including this. Just few weeks ago I bought myself STM32 board and even managed to generate analog 15Khz RGB video on it. I feel like I could get something like in the OP here, but I've got so many things going on, work, demos intros, games... I regret not getting into this sooner when I was still in school hehe |
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Krill
Registered: Apr 2002
Posts: 2839 |
Quoting tlrCool concept! I guess something like this could be done using the 1541U2 as platform. I think there was some experimental copper code in there at one time but you could always go full custom. Seeing that "REU release" (https://csdb.dk/toplist.php?type=release&subtype=%286%29) is a thing, going full Copper using 1541U would be the next logical step. But there aren't any plans to permanently add something like that, are there? |
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Golara
Account closed
Registered: Jan 2018
Posts: 212 |
Quote: Quoting tlrCool concept! I guess something like this could be done using the 1541U2 as platform. I think there was some experimental copper code in there at one time but you could always go full custom. Seeing that "REU release" (https://csdb.dk/toplist.php?type=release&subtype=%286%29) is a thing, going full Copper using 1541U would be the next logical step. But there aren't any plans to permanently add something like that, are there?
I think they should create a new tag called "steroids" or something, since there's so few releases of this type anyway, no point in dividing it even more. |
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Laurent
Registered: Apr 2004
Posts: 40 |
I added a 50 FPS 'movie' here :
https://www.youtube.com/watch?v=PZ6uRSK7x7U |
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ChristopherJam
Registered: Aug 2004
Posts: 1378 |
Nice work! On both the hardware/firmware side and the video conversion.
What mode does VIC think it is displaying? |
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