cwc@mhuxd.UUCP (Chip Christ) (06/26/85)
Thanks to all those who replied to my query. In addition to those
who offered enlightenment, there were quite a few who asked to be
clued-in to what I found out, so here goes--
As I understand it now (albeit sketchy), screen control at the ASCII
character level, i.e., escape sequences and/or control characters,
conforms to the ANSI X3.64 standard and is implemented via definitions
in the ANSI.SYS file. Therefore, unless other manufacturers implement
a larger set, the limited number of screen controls contained in
Chapter 13 of the IBM PC-DOS manual are it!
Applications such as terminal emulators, which implement larger/full
sets of screen controls, do so by writing directly to memory, turning
on/off bits which control display characteristics. I'll have to
guess that this can be done in a more-or-less machine-independent way
as there are a raft of programs which run on a variety of hardware
and still manage to do some impressive stuff. But that's something
that'll have to be put on the back burner, as far as I'm concerned.
Thanks, again to all who helped.
Chip
p.s. re: AT&T PC6300-- I have no idea what is implemented, what I
know is strictly through trial-and-error. :-(