vm02: calling all IIcs - Take 3

[David Schmenk <dschmenk@YUCH.gmail.com>]

Whew.  I really hope this works.  Thanks again to all who tested and 
submitted feedback on this project.  While spending so much time working 
out the IIc VBL issues, I was negligent with the II/II+.  I went to 
re-test the classes that use the 80 column card and found a mess.  My 
videx doesn't do well being interrupted.  So, I finally worked out a 
solution by disabling interrupts during initialization and setting MSLOT 
myself before calling the output routine (with interrupts enabled).  I'm 
not terribly pleased with the character output code which uses the CSW 
function pointer, so I may write a real output routine for the videx and 
IIe/IIc.  I understand that the un-enhanced IIes disable interrupts 
during screen access which disrupts high speed serial I/O.  Can't have that.

Here is the latest image:

http://schmenk.is-a-geek.com/tarfiles/VM02ALPHA4.DSK.zip

Dave...