I used a Pentium 200MMX, 48M Ram, 4M PCI Vid card with MAME for many years, so I can give you some helpful advice.
First - be realistic - PacMan, Galaga, Donkey Kong, etc. should play perfectly on that machine. Gyruss will work but will show Frameskips of 5-6 (out of 11). Games like 1942, 1943, Twin Cobra, Pole Position, etc. will run but they will also be around Frameskip 5-6 (but very playable). Newer games like Afterburner will be around Frameskip 10 and virtually unplayable. Forget about Mortal Combat, NBA Jam, etc.
Second, Automatic Frame Skipping on that slow a machine is noticeable during gameplay. (The game will stutter as AFS decides it needs to kick it.). For games that can't play full speed, it works better to run the game with AFS on and F11 pressed, see what the average or highest FS encountered is and then run the game at that fixed Frameskip.
- When I use mame or mame32 , almost no difference between speed
Agreed, but it will vary with the game in question.
- When I use mame32v36b9, gyruss works fast enough ...
So, I should use mame32v36b9 ...
36B9 is a pretty good choice, 36b12 has possibilities also.
Setup suggestions - Run command-line versions of MAME. (B/c you will use a front-end for the interface). Pick a primary build and install it to C:\MAME\mame.exe (say R36B12). Install your ROMS to C:MAME\ROMS\. Install "other" versions of MAME to C:\MAMER37B16\mame.exe or C:\MAME053\mame.exe. Edit the mame.cfg or mame.ini files of these versions to point to C:\MAME\ROMS or their individual ROMS folder (separate the paths with a ; ). This way you only need different ROMS for the MAME versions that won't work with the main one. (i.e. you have 3000 Roms in one directory and 10-20 in separate folders, rather than 5 folders with 3000 roms each).
Next, find a front-end that allows you to specify a commandline for each game and ideally, a custom list of games.
www.mameworld.net/emuloader and
www.arcadeathome.com can do this, as probably could MAMEwah or Dragon King. This way you just see a list of games, but one might run in R36B12 and one might run in 0.56, but you don't have to keep track of which MAME version to open to play each game.
Here are my notes on older versions of MAME. I would not run anything much beyond 0.75 on that machine, unless you needed that version for a particular game.
R36B10 - R36B16, The PONG Dynasty.