You may want to update dosbox for maemo - 0.74 is latest version (it requires You to have extras-devel enabled, at least for this single update)

After update (remember, You will get new config with 0.74 in it's name - changes in 0.73 won't be used in 0.74 version, unless specified as startup argument!), change the following lines (I'm posting, how they *should* look, not how they look now):

... by the way, are You insane man?! Putting 64 MB into dosbox emulated machine? It doesn't work like that, increasing it below sane limits, actually slow things down. And, actually, never ever use more than 32 MB, even on desktop computer. On N900, use max 16MB, for most games 8 or 4 is sufficient. Games from that era won't (most of the time) use additional memory, but You're still taking it out from Maemo reserve.

...now, if You want to have sound, use:
...otherwise, use:
And report back about Your findings. Also, using overclocked max frequency is recommended (900 upper limit, i don't recommend going higher than this).

If You still got problems with fluidity, first thing to do is disabling sound. Then, You may try increasing frameskip (by 1 on every try). I don't recommend going higher than 5 frameskip, cause it's going to cause tear-down look, no matter of performance.

Also, keep in mind, that in dosbox 0.74 output=overlay doesn't work, but output=surface does. That's why I changes it in config. If You insist on using dosbox 0.73, You can leave it as overlay, but keep aspect=true, and change scaler to scale=none

/Estel