Yeah, I left it that way. I assume bit 3 of the page register is still there, but simply not connected to the ROM.
Regarding MAME compile, if compile/linktime is slow, you could do a partial compile. Like this: set SUBTARGET=m set SOURCES=src/mame/drivers/hh_tms1k.cpp,src/mame/drivers/ticalc1x.cpp
