Modified TRDOS with FDC controller emulation (software emulation similar as on my project)
http://atmturbo.nedopc.com/projects/hdd_prj.htm
This is TRDOS version for ATM TURBO computer. If source code will free, I can compare both (this and my) emulation routines/methods and this help me with hdd-trdos finalization.
LAESQ (author of ESXDOS system) use also software FDC emulation:
http://esxdos.org/
VELESOFT