from http://www.vintage-computer.com/vcforum/showthread.php?40843-Downgraded-Ultima-II-(From-Re-released-version-1985-to-Original-release-1984)&p=308515#post308515

You can see the pflux.exe , pri.exe and psi.exe in bin folder.

How to convert?

As you know Kyroflux images exsit as total 168 files (track.00.0.raw ~ track.83.1.raw)

run pflux as follows

pflux track00.0.raw -p double-step -h 1 -p delete -r 600000 -p decode pri disk1.pri

Then you can convert .pri to .tc (Trans Copy image) by using pri.exe

pri disk1.pri disk1.tc

To run PCE emulator

you can convert .tc to .psi by using

psi disk1.tc disk1.psi

(.pri <-- pce raw image / .psi <-- pce sector image)

According to author of PCE (hampa), .pri image is nearly similar to .tc format. (But not same)

But to convert MFM track (0-39) , FM track (40- ) and sector which can be accessed by Read/Write Track Command method, you need to run as following.
(This must be more difficult)

# Decode at 600 KBit/s (for MFM)

pflux track00.0.raw -p double-step -h 1 -p delete -r 600000 -p decode pri disk1-mfm.pri

# and extract tracks 0-39

pri disk1-mfm.pri -c 40-99 -p delete disk1-mfm.pri

# Decode at 300 KBit/s (for FM)

pflux track00.0.raw -p double-step -h 1 -p delete -r 300000 -p decode pri disk1-fm.pri

# and extract track 40

pri disk1-fm.pri -c 0-39 -p delete -c 41-99 -p delete disk1-fm.pri

# Merge the two images

pri disk1-mfm.pri -m disk1-fm.pri disk1.pri

# Convert .pri to .tc

pri disk1.pri disk1.tc


But I don't know KF image with weak bit track (Mainly on Track 0) can be converted to TC image correctly.

I've tested the following.

Ultima II <-- Original Release (1983) with KF
Ultima III <-- Original Release (1984) with KF

Except Track Length, Written process has no problem by using converted TC image.


# Decode at 600 KBit/s (for MFM)
$ pflux disk1.pflx -p double-step -h 1 -p delete -r 600000 -p decode pri disk1-mfm.pri
# and extract tracks 0-39
$ pri disk1-mfm.pri -c 40-99 -p delete disk1-mfm.pri

# Decode at 300 KBit/s (for FM)
$ pflux disk1.pflx -p double-step -h 1 -p delete -r 300000 -p decode pri disk1-fm.pri
# and extract track 40
$ pri disk1-fm.pri -c 0-39 -p delete -c 41-99 -p delete disk1-fm.pri

# Merge the two images
$ pri disk1-mfm.pri -m disk1-fm.pri disk1.pri