Summary

Fix a few issues with the YMF-7xx cards:

• Correct the (default) SBPro DSP version to 3.01
• The SBPro DSP on YMF-7xx cards return 0x00 when reading the Read Data Ready port during DSP reset
• Implement DSP version switching on both YMF-7xx chip families. Along with the Read Data Ready port change this fixes the SoftSynth on newer Win3.x/Win9x drivers.

Checklist

• Closes #xxx
• I have tested my changes locally and validated that the functionality works as intended
• I have discussed this with core contributors already
• This pull request requires changes to the ROM set
  • I have opened a roms pull request - https://github.com/86Box/roms/pull/changeme/
• This pull request requires changes to the asset set
  • I have opened an assets pull request - https://github.com/86Box/assets/pull/changeme/

References

Provide links to datasheets or other documentation that helped you implement this pull request.