I have a copy of the SIL Abyssinica font. Can you tell me how this differs from Abyssinica SIL?
SIL Abyssinica (and SIL Abyssinica U and SIL Abyssinica G) was an early, unreleased version of Abyssinica SIL. Although a Unicode font, it only supported Unicode 3.0 and thus had a number of PUA characters in it which have since been added to Unicode 4.1 and 6.0. The PUA codepoints and corresponding Unicode codepoints are listed below. Abyssinica SIL has these double-encoded (either PUA or Unicode 6.0 codepoints will work). However, you should consider converting your data to Unicode 6.0. A mapping file to convert your data from PUA to Unicode 6.0 is available here: Mapping Files.