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[root@sandman bin]$ mp -playback galap1.inp galap1
INPVIEW: using layout type 'standard'
Input file invalid or in an older, unsupported format
Ignoring MAME exception: Input file invalid or in an older, unsupported format

when I then play a new game in 0.125 and try to play it back I get

[root@sandman .xmame]$ mp -playback galmidw.inp galmidw
INPVIEW: using layout type 'standard'
Input file: galmidw.inp
INP version 2.0
Created Tue May 6 19:49:11 2008
Recorded using MAME 0.125 [W] (May 6 2008)
Total playback frames: 243
Average recorded speed: 99%

Is it supposed to happen and I have to keep around my sdlmame 0.123 binary to watch older .inps ?

yeah the inp format is drastically changed, and will not be able to playback old inps. This is pretty much the reason we note the mame version on all recordings so we can get the right one when playing back. For years now I have been wanting to put together a tool that will auto download the exe (and maybe autobuild the wolfsource for linux) and configure the right options for playback all only given a marp/harp filename. I have all the code in bash scripts and i use it constantly but it's making it user friendly that's the hard part. My hope is a tool like that could make marp more useable and popular, even though it wouldn't auto download the rom for you of course.

Oh well, 'sokay...

Just wanted to make sure I hadn't somehow botched the 0.125 build... thanks !

it's a pretty easy change to wolfmame now, almost too easy. I guess the question was do 125 inps work and it looks like you've observed they do.