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Looks like Arbee forgot to add the code that adds the O_BINARY flag on the open call if there's a "b" in the mame_fopen parameter. The *nix systems must open as binary by default, but under mingw it doesn't.

It's probably not there because O_BINARY doesn't exist on *nix. If it was added it would have to be guarded by an #ifdef or similar.

Aaron's of course correct (as is Ex-Cyber - it's not there by default because *ix (including the Mac) doesn't have the concept of the operating system trying to interpret line endings). There's one or two other mistakes in fileio.c relative to Windows that I did fix, but I missed the most important one

ETA: I'm a real menace. If you aren't liking the performance, find this in the makefile:

CFLAGS += -DNDEBUG \
$(ARCH) \
-Wall \

And add a -O3 somewhere, like this:

CFLAGS += -DNDEBUG \
-O3 \
$(ARCH) \
-Wall \

The funny thing is none of the 3 Intel OSes showed a severe degredation from this, but my G5 really suffered - it's 2 GHz and couldn't run konamigx games full speed.