- better 8250 emulation;
- fake vertical retrace bit in Input Status #1 register
(this was lost in the VGA emu rewrite).
Submitted by: Igor Serikov <bt@turtle.pangeatech.com>
- slightly more accurate VGA hardware emulation;
- more int 10 functions, especially wrt to palette handling;
- first shot at graphics support;
- mode switching.
Bugs:
- graphics too slow;
- only 16 color modes work for now;
- works only under X, and only with 16 bit TrueColor visuals;
- far from being genuinely useful (I can play an old EGA game now, though
(mahjongg.exe)).
Also, the code has been cleaned up a bit (more to come in a separate commit).
doscmd heavily depends on struct sigcontext which luckily is mostly passed
between functions as usion regcontext_t. By redefining union regcontext_t in
terms of mcontext_t almost all bases are covered.
It also seems to me that doscmd was in a transitional state. The redundant
definitions made it difficult to get a clear overview and could easily cause
oversight. To make sure my changes were ok, I went as far as to complete the
transition. It was not exactly necessary, but I expect to have to come back
here some more ("whistle" if I'm wrong :-).
o Make the dos emulation treat c: and C: the same way. Sourcer was doing
a chdir("c:\\") rather than a chdir("C:\\");
o use drlton() in all places where we used to use -'A' so that we're always
case independent.
o use drntol() in all places where we used to use + 'A' for similar reasons
interface for callbacks to doscmd from DOS, obsoleting the instbsdi
redirector. (redir.com replaces it)
A temporary hack is in place so the instbsdi program will (hopefully) work
in the short term.
Submitted by: Helmut F. Wirth <hfwirth@ping.at>
