User`s manual

TransType Pro
38
Assigning the Codepage
In the Codepage submenu you can see three common commands and a
list of Macintosh codepage names:
Default
Use the destination codepage selected as the default in Defaults/
Codepages & Scripts Page of the Preferences dialog.
Unicode
Is not usable in the case described here.
Leave as is
Do not reencode the source font – any selection in the source list’s pop-up
menu is ignored.
A list of potential codepages to which the font can be reencoded follows
these three commands. The number of available codepages depends on the
number of characters in the font.
When TransType finally gets the information about the Unicode indexes to
which the font characters are mapped (from the font or after you have
assigned a codepage to the source font), it knows which destination
codepages this font can support and shows only these codepages in the
destination encodings menu.

Tip: To force TransType to include all available Macintosh codepages in
this menu, press and hold down the Command key on the keyboard
before clicking the pop-up menu button. To get access to all the possible
codepages, click and hold down the Option key.