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Forums > C64 Coding > Ultimax unleashed..
2019-11-21 10:59
andym00

Registered: Jun 2009
Posts: 45
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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2020-03-23 22:12
Oswald

Registered: Apr 2002
Posts: 5129
ok then VICII will never get better than that :)
2020-03-23 22:31
Krill

Registered: Apr 2002
Posts: 3106
SID might have a few tricks up its sleeve when being driven at 1 MHz as well. :)
2020-03-23 22:37
Frantic

Registered: Mar 2003
Posts: 1661
Maybe it can generate a PAL signal? :) (note: I don't know anything about the hardware requirements involved to generate a PAL signal.)
2020-03-23 22:56
Oswald

Registered: Apr 2002
Posts: 5129
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 :)
2020-03-23 23:50
Mr. SID

Registered: Jan 2003
Posts: 425
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...
2020-03-24 06:34
ChristopherJam

Registered: Aug 2004
Posts: 1427
NTSC might be doable - the dot clock is more than double the chroma carrier frequency over there.
2020-03-24 13:21
Oswald

Registered: Apr 2002
Posts: 5129
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...
2020-03-24 13:28
tlr

Registered: Sep 2003
Posts: 1822
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.
2020-03-24 16:40
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 ?
2020-03-24 16:46
chatGPZ

Registered: Dec 2001
Posts: 11540
There is hardly any memory for it in the first place :)
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