Raspberry Pi for DOS
https://www.youtube.com/watch?v=ogHqmjn6sY4
Kinda interesting decisions. Hardware recreations of the Pentium and various vintage sound cards, handles various problems like ITX not being available on modern computers (in case you want to connect a sound card directly), can present USB kbam as PS/2 kbam, and presents an sd card as a DOS-recognizable hard drive.
@mcc I've got one of BMOW's Floppy Emus for Apple II/Macintosh, with the "noisy disk" add-on speaker. It convincingly mimics both the Disk II noises and the click of hard disk activity. I am considering finding some way to encase the speaker so that it is less loud.
This YT vid of mine demonstrates the hard disk clicking:
https://youtu.be/62BkZ6CWwB8