TR-DOS 6.11 support ramdisc, but is impossible use NMI button if KR1818VG93 controller absent. I use only TR-DOS rom with ramdisc and 1MB ZX ram. After NMI tr-dos access to FDC ports and wait in neverending loop...

I use also TR-DOS 6.11 (pentagon 1024 version) with ramdisc on drive "A:", but it's same.

Is impossible save snapshot to ramdisc.
Next big bug is in command "LIST". This command allocate memory without deallocation at end of command.
Impossibility use LOAD "file" SCREEN$ or RUN "file" CODE
All this bugs is fixed and work correct on TR-DOS 5.05(czech)
