Because these motherboards use SH-1 CPU IC101 or IC36
(motherboard models include: VA0-VA5, VA8, Va9)
The motherboard with IC37 chip can run normally without cd-rom drive.
(motherboard models include VA6, VA7, VA10, VA11, VA13, VA15)
Multiple options are available. Shorter cable may achieve fast read and write speeds.:)
Murzik's scheme makes it easier for us to backup and restore memory card files. Can you study how to convert memory card file between the Real Hardware and the EMU（yaba、ssf....）?
I have tested yaba pro...