# .fcm

FCE Ultra Movie File Format

- Updated March 22, 2004

The FCM file format is a somewhat "joined" file format. The first part of a FCM

file will contain an FCS-format state save. After this data, the FCM-specific data

begins, which is being referred to from this point.

Currently, the only supported input scheme for a FCM is four joysticks.

The FCM data consists of a stream of joystick commands:

dLLjjbbb

d = Dummy update, if set. Used to reset frame timestamp.

LL = timestamp length, in bytes(maximum of 3 bytes).

jj = Which joystick(0-3).

bbb = Which button(0-7).

If the dummy update bit is set, a command can also have occurred. Look at the

lower 5 bits:

0 = Just a dummy update.

1 = Reset

2 = Power

The timestamp is stored after the joystick command, in LSB-first format. It is

the number of frames since the last event. A timestamp length of "0" is valid, to

be used when several different buttons need to change state at the same time(same frame,

at least).

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