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Forums > C64 Composing > 8580 overdrive not emulated
2020-07-15 10:27
booker
Account closed

Registered: Jul 2003
Posts: 334
8580 overdrive not emulated

Hello

Not sure if anyone is still working on SID emulation, however I think there's one bit missing from both Dag Lem's (which I love) and resid-fp

http://ehion.com/~booker/booker.c64scene.pl/8580overdrive.html

Tune (with source .sng) is here Intro 57

Time: 6th second.
 
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2020-07-15 11:13
Krill

Registered: Apr 2002
Posts: 3070
Is there technical info on that phenomenon?
2020-07-15 11:38
booker
Account closed

Registered: Jul 2003
Posts: 334
Quoting Krill
Is there technical info on that phenomenon?

Hi Krill. Not much that I would know. But when checking back in 2011 on couple of C64s, Hardsid Quattro and HardSid Uno all these would reproduce it.
2020-07-15 12:51
Jammer

Registered: Nov 2002
Posts: 1343
Quoting Krill
Is there technical info on that phenomenon?


I haven't come across any technical sheet on this :( Just figured it out empirically. 8580 starts to distort at low coarse cutoff (like $01), together with highest filter resonance and 'strong' pulses. Simply speaking - cannot handle lowest subs very well :D
2020-07-15 13:05
chatGPZ

Registered: Dec 2001
Posts: 11499
As usual, the best way is to open a ticket, and try to describe the problem as precise as possible, and provide a simple way to reproduce it (a tune usually is not).
2020-07-15 13:10
Jammer

Registered: Nov 2002
Posts: 1343
Quoting Groepaz
As usual, the best way is to open a ticket, and try to describe the problem as precise as possible, and provide a simple way to reproduce it (a tune usually is not).


It's not a problem, it's potential feature! :D
2020-07-15 13:37
chatGPZ

Registered: Dec 2001
Posts: 11499
As soon as someone opens a thread on csdb it turns into a problem quickly =P
2020-07-15 13:47
booker
Account closed

Registered: Jul 2003
Posts: 334
Quoting Groepaz
As usual, the best way is to open a ticket, and try to describe the problem as precise as possible, and provide a simple way to reproduce it (a tune usually is not).

Thx. What is the place to put the ticket on?
2020-07-15 13:48
chatGPZ

Registered: Dec 2001
Posts: 11499
https://sourceforge.net/projects/sidplay-residfp/ .. thats what leandro reads, changes will then usually drip into VICE too
2020-07-15 13:56
booker
Account closed

Registered: Jul 2003
Posts: 334
Thanks Greopaz. Any idea if Dag Lem is reachable?
2020-07-15 14:04
chatGPZ

Registered: Dec 2001
Posts: 11499
He is, but he hasnt worked on ReSID for a long time.
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