Just take a look at readme.txt file shipped with dooengine, it should help you
You can play r-type but not dracula, dooengine does not support cd rom (yet ...)
Oh gee, for some reason I assumed the PC Engine was an exclusively CD-ROM based system.
This only proves how little I know about the console, it's actually my first contact with it.
Its a great little system for its time.
1st version had credit card rom carts
Then came the 1st CD rom version with a 1x speed CD drive in fact it was the first thing to properly us a CD drive out side the audio world
Look up the PCE GT and the LT. The LT is very nice - a mini, DS type machine with fully res size screen, oh how I still want one of those..
I think the thing that i offered more than anything was a unified system and all the companies (other than nintendo) creating things for it.
When the emulation on Dingoo is 100% speed, check out all the shooters on the system there are some great ones (Gunhead, star solider, R-type 1/2, Super Star Solider, Croyoon, Gradius etc...)