Address prologue modified alternate on the even/odd tracks
Data epilogue modified
EOR encoded RWTS.
Half disk is unreadable.
A Pascal directory entry.
...
Is not enough?

Well, this program is single loaded it can be (easly *) captured
and saved in a file.

Now what? Let's make a ProDOS version!

Read the source PENSATE.SYS.S for more detail.

* easly now with the AppleWin debugger.