Apart from the ST, which has already been mentioned :
BBC Micro, Acorn Archimedes, many older portables (Tandy 100, HP110, HP71
and HP75 (almost), EPSON PX4 and PX8), there was a model of the Tandy
1000 with MS-DOS in ROM, one of the Torch machines had a CP/M a-like in
ROM, HP IPC, Tandy CoCo + disk controller (maybe this only counts as
Basic in ROM), and plenty more that I've forgotten about
I belive Apple's Newtons have the OSes in ROM. They certainly do boot
quickly and a chip swap is need to upgrade the OS.
Tom Owad
Sysop of Caesarville Online
Client software at: <http://home.earthlink.net/~tomowad/>