Log inRegister an accountBrowse CSDbHelp & documentationFacts & StatisticsThe forumsAvailable RSS-feeds on CSDbSupport CSDb Commodore 64 Scene Database
You are not logged in 
CSDb User Forums


Forums > C64 Coding > Ultimax unleashed..
2019-11-21 10:59
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
 
... 43 posts hidden. Click here to view all posts....
 
2020-03-23 22:12
Oswald

Registered: Apr 2002
Posts: 4531
ok then VICII will never get better than that :)
2020-03-23 22:31
Krill

Registered: Apr 2002
Posts: 1405
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: 1406
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: 4531
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: 371
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: 1031
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: 4531
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: 1264
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: 21
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
Groepaz

Registered: Dec 2001
Posts: 9157
There is hardly any memory for it in the first place :)
Previous - 1 | 2 | 3 | 4 | 5 | 6 - Next
RefreshSubscribe to this thread:

You need to be logged in to post in the forum.

Search the forum:
Search   for   in  
All times are CET.
Search CSDb
Advanced
Users Online
Mythus/Delysid
Rebok
Didi/Laxity
Black Beard/Abyss, A..
Brittle/Necta!^Demozoo
awsm/MYD
Karmic/HVSC/ONS
E$G/HoKuTo FOrCE
Knobby/Role
Jazzcat/Onslaught
Dymo/G★P
LKP/CFN-3001
Guests online: 47
Top Demos
1 Uncensored  (9.7)
2 Coma Light 13  (9.7)
3 Edge of Disgrace  (9.7)
4 Comaland 100%  (9.6)
5 Unboxed  (9.6)
6 The Shores of Reflec..  (9.6)
7 Remains  (9.5)
8 Lunatico  (9.5)
9 We Come in Peace  (9.5)
10 C=Bit 18  (9.5)
Top onefile Demos
1 Dawnfall V1.1  (9.6)
2 Crystal Gazer  (9.6)
3 Space Demo  (9.5)
4 Field Sort  (9.5)
5 Instinct  (9.5)
6 The Tuneful Eight [u..  (9.5)
7 Smile to the Sky  (9.5)
8 Rewind  (9.5)
9 Onef1ler  (9.5)
10 Bad Boy  (9.5)
Top Groups
1 Performers  (9.6)
2 Oxyron  (9.4)
3 PriorArt  (9.4)
4 Booze Design  (9.4)
5 Censor Design  (9.4)
Top Logo Graphicians
1 Pal  (9.3)
2 Mermaid  (9.2)
3 Yazoo  (9.1)
4 Elko  (9.1)
5 Shine  (8.8)

Home - Disclaimer
Copyright © No Name 2001-2020
Page generated in: 0.058 sec.