No, Dosbox turns a 2GHz PC into a 486SX, and CPU usage will be high. A simple way to run DOS games is.. running them under DOS. which works perfectly on my newly built AM2 sempron with 2GB ram (618K free conventional memory
, without sound and CD for now).
the DOS installation, tools and games were transferred to my third partition from another PC's HDD (K6 200, 32MB/2GB) by use of the sys command and xcopying everything (didn't take long).
it's MS-DOS 7.10 (from windows 98), very good at conventional memory and supports FAT32. the 4DOS shell is installed (tab completion!, aliases, more stuff), there is also free software ssh and scp (great!), provided you have a NIC with available/existing packet driver. (but that's more useful for the other, DOS-only PC). Games can be launched with a .bat menu, using choice.com, IF ERRORLEVEL and gotos. (C:\BAT is in the PATH, as well as C:\UTIL\PKZIP, etc.)
nice setup, I'm glad to have wasted time on it (will have to do a FreeDOS install as well). it just works no matter the PC. DOS just works. if you take account of DOS gaming while designing your micro-laptop you'll provide compatible sound card and NIC, a FreeDOS installation with LFN support on a small flash drive, USB with a driver for cdrom and mass storage maybe.
the device could be based on a x86 SoC and not even need the power of a 500MHz Silverthorne, be cheap, have a long battery life. and with RS232, so it can log on stuff and reprogramm stuff. That machine would also be ungodly fast, as DOS stuff is on that 200MHz PC.