Help understanding dreamshell

[keilmillerjr]

I am trying to get a good understanding of dreamshell. Perhaps some one can help me.



Connections

• SD mod consists of usb flash media being modified to connect to the serial port.
• CD is the GD-rom drive.
• IDE mod consists of piggy backing from the bottom of the gd-rom connector solder points?
• PC I have no idea what this is?
  

Settings

• What is DMA?
• What is async read?
• Why wouldnt all CDDA audio be emulated automatically if present on disc image?
• Is Katana sega's operating system? Does detecting it automatically not work all the time?
• What is "loader device?"
• What do all the boot mode options mean?
• What is loader memory?
  

It is a lot of questions. However, it will help me understand dreamshell, compatibility, and how the dreamcast works in general. I have web programming experience and could possibly do something to contribute to the scene. Thank you.