Hey, Curt, there's a bug in the MC6847 implementation!

Compare this code in current M.E.S.S. MC-1000 and in BrMC-1000:
Code
10 GR : OUT 128,96
20 FOR A = 0 TO 255
30 POKE 32768 + A, A
40 NEXT
50 CALL 49158 : REM PRESS ANY KEY TO EXIT
60 TEXT
(Real MC-1000 works just like BrMC-1000 here.)

The difference is due to an error in http://git.redump.net/cgit.cgi/mess/tree/src/mess/video/m6847.c:
Code
 1732             /* semigraphics 6 */
 1733             ch = (byte & 0x3F) + 0x60;
 1734             *fg = ((byte >> 5) & 0x03) + ((attr & M6847_CSS) ? BUFF : GREEN);
">> 5" should be ">> 6".