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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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Oswald
Registered: Apr 2002
Posts: 5031 |
ok then VICII will never get better than that :) |
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Krill
Registered: Apr 2002
Posts: 2856 |
SID might have a few tricks up its sleeve when being driven at 1 MHz as well. :) |
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Frantic
Registered: Mar 2003
Posts: 1633 |
Maybe it can generate a PAL signal? :) (note: I don't know anything about the hardware requirements involved to generate a PAL signal.) |
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Oswald
Registered: Apr 2002
Posts: 5031 |
Quote: Maybe it can generate a PAL signal? :) (note: I don't know anything about the hardware requirements involved to generate a PAL signal.)
that would be the craziest shit anyone ever did :) |
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Mr. SID
Registered: Jan 2003
Posts: 424 |
Quote: Maybe it can generate a PAL signal? :) (note: I don't know anything about the hardware requirements involved to generate a PAL signal.)
Certainly not, that requires about 5 MHz of bandwidth... |
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ChristopherJam
Registered: Aug 2004
Posts: 1382 |
NTSC might be doable - the dot clock is more than double the chroma carrier frequency over there. |
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Oswald
Registered: Apr 2002
Posts: 5031 |
Quote: Certainly not, that requires about 5 MHz of bandwidth...
a wave of a single channel has that resolution, and you can manipulate 1 sid register at a time at 1 mhz... |
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tlr
Registered: Sep 2003
Posts: 1731 |
Quote: a wave of a single channel has that resolution, and you can manipulate 1 sid register at a time at 1 mhz...
The SID is clocked at 1 MHz so the sample rate at the output is at most 1 MHz. This gives a theoretical maximum signal frequency of 500 KHz. |
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Laurent
Registered: Apr 2004
Posts: 40 |
Speaking about the SID, if only we had a register that simply latches to a voice internal accumulator, with freq = 0 we'd have a trivial way to play 8 bits samples, and voice ADSR would be still available.
I assume back then they didn't think people would want to play PCM samples ? |
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chatGPZ
Registered: Dec 2001
Posts: 11154 |
There is hardly any memory for it in the first place :) |
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