Digiplay support

[LouDnl]

I had this working with v0.2.0-BETA firmware in Vice by using libusb async and their (libusb) example but for some reason I can't find that piece of code anymore and cannot get it to work again.

Seeking some assistance in writing a working driver for digiplay.
This will probably need some buffering for sending filled up 64 byte packets and firmware side handling.

[LouDnl]

As of yet I am still unable to recreate a working Vice version driver, work in progress.

[LouDnl]

Note:
With vice (xs64sc) on linux and usbsidasync enable, when using alsa and not pulse as sound driver with output on stereo, quality on 22KHz, buffer on 1ms and fragment size on very small the audio from the usbsid improves by miles, but eveything is played way too fast.
In vsid improvement is different.

[LouDnl]

@thomasj I thought digiplay did not work through ASID?
I recreated a working version of Vice 3.8 with ASID support and this plays some digitunes, strange!

[thomasj]

There is nothing in the ASID protocol itself that prevents digis from playing (as it is only updating SID registers) - but the original design of it was only using standard MIDI speed, which is too slow for digis. So when running ASID over USB with a receiving device that could handle thousands of updates per second, digis probably should work fine!

[LouDnl]

There is nothing in the ASID protocol itself that prevents digis from playing (as it is only updating SID registers) - but the original design of it was only using standard MIDI speed, which is too slow for digis. So when running ASID over USB with a receiving device that could handle thousands of updates per second, digis probably should work fine!

Thats good to know! It's not perfect yet, but now I'm getting somewhere ;)

[LouDnl]

Digiplay issues mostly solved with a new driver (first version) and tested with added support to libsidplayfp and played with sidplayfp.
Not all digitunes are fixed yet, but that shouldn't be a huge issue.

[LouDnl]

New driver got me steps closer to solving the issue in Vice too. Not finished yet, but getting there!

[LouDnl]

While still not completely in cycle sync, playing Commodore 64 digitunes with Vice (and others) using USBSID-Pico are almost fixed! Here's an example using Quantum Tracker's No Limit demo!

Quantum.Tracker.-.No.Limit.with.USBSID-Pico.mp4