According to Orlando Llanes:

Using GPC's asm statement allows us to set the function result with an ASM statement, but how do I set the result of a function through an external assembly routine? [...]

Just guessing - but educatedly (-: This is defined by the environment (the operating system, in essential) the compiler has to work in. AFAIK, DJGPP defines 32-bit function return values to be returned in the `eax' register. I do not know about longer values, but you can look it up from `gpc -S foo.pas' *without* optimization. (With optimization, GPC might deviate from this convention in cases where function are always called from the same place where it increases performance to return a value in a non-standard register.) Peter -- Peter Gerwinski, Essen, Germany, free physicist and programmer Maintainer GNU Pascal - http://home.pages.de/~GNU-Pascal/ - 1 Oct 1997 PGP key fingerprint: AC 6C 94 45 BE 28 A4 96 0E CC E9 12 47 25 82 75 Fight the SPAM! - http://maps.vix.com/