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Forums > CSDb Discussions > ReSID DLL interface?
2019-05-02 17:11

Registered: Nov 2006
Posts: 28
ReSID DLL interface?

Is there any documentation for the interface for the ReSID/ReSIDFP DLL (thought of using LibReSIDFP.dll from the XSID project), or are there any other docs that can help figuring out how to use it? Or is it a case of RTFC?
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2019-05-21 20:59

Registered: Nov 2006
Posts: 28
I got a 6581 running, but I don't get any output from an 8580. I don't get what the difference is; it seems that I need to clock the 8580 for each write I do? What gives?

void SID::write(int offset, unsigned char value)
busValue = value;
busValueTtl = modelTTL;

if (model == MOS8580)
delayedOffset = offset;
delayedValue = value;
writeImmediate(offset, value);
2019-05-21 23:42

Registered: Apr 2002
Posts: 1440
You're trying to write multiple SID registers in the same clock cycle?
2019-05-21 23:45

Registered: Nov 2006
Posts: 28
Yes, that works fine for 6581. I'd like to keep all time management in the sound driver, not the data write routines. I'm not trying to emulate a c64.
2019-05-21 23:49

Registered: Apr 2002
Posts: 1440
I... i don't even
2019-05-22 00:03

Registered: Nov 2006
Posts: 28
I'm not sure what's so strange. Is it illegal to break the laws of physics in an emulated device?

Writes are made asynchronously. And the time is stepped in chunks.
2019-05-22 00:22

Registered: Apr 2002
Posts: 1440
You might not want to emulate a C-64, but i take it you want to emulate a SID... AND expect the emulation to be faithful?

Then really, you cannot violate its fundamental hardware principles, emulated or not. No more than one read or write per clock cycle (yes, synchronous), as there are latches and whatnot in its internal state machine.

6581 might look like it's working with that horrible hack, but i'm pretty sure some things are quite distorted compared to the real chip.

What's so problematic about spreading out your writes over several clock cycles?
2019-05-22 00:27

Registered: Nov 2006
Posts: 28
That would entail making a queue and screwing around in the driver routine, and I'm lazy :)

But I guess it's doable. Although a 6581 is alright, a 8580 is more synthy and more suitable for my purpose.
2019-05-22 00:33

Registered: Apr 2002
Posts: 1440
Yeah, and about the asynchronous writes... Do you mean you called the set-register function asynchronously, from another thread than the one running the actual emulation? If you do that, make sure you have your synchronisation primitives under control. :)
2019-05-22 00:39

Registered: Nov 2006
Posts: 28
Yeah, that wasn't a problem with other emulators/synths I have used in the past. Perhaps it would be a problem with resid(-fp), didn't investigate the code to figure that out. Right now it's a moot point. Just bring in an SPSC queue, put things in one end asynchronously and write them to the SID in the driver. No locking needed.
2019-05-22 09:56

Registered: Apr 2002
Posts: 1440
The synchronisation will then probably be encapsulated within and implemented by the SPSC queue.

Perhaps you should also take some care about the write order of SID registers, as that can make quite some difference.
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