The /etc/ppp/options file changes or additions
debug (I never figured out where this info was recorded)
/dev/ttyS1 (My modem was Com2)
115200 (modem speed)
modem (I don't know why we need this AND ttyS1)
crtscts
asynncmamp 0
defaultrouter (more on defaultroute later)
noipdefault (usual for dhcp dialup account)
lock
connect "/usr/sbin/chat -v -t 250 -f /etc/ppp/chat-myisp"
(I don't know what the numbers mean)
I just now see that this says "defaulterouter" instead of "defaultroute"
Maybe this caused my later problem.