works) for my machines and now-nonexistent test machines. Clean up
options in existing config files so that they're more consistent. Add
more units of various pseudo-devices to several.
chip-independent clock code. 'clock' has been renamed 'mcclock' 'clock'
has been renamed 'mcclock' (since it's a driver for that particular
clock, and since eventually there may be another clock chip driver),
and now attaches via seperate match/attach functions to both TC and ISA.
This removes a whole lot of #ifdefs...
cgd