If I remember correctly, even with a color card, applications switching to a monochrome video mode was possible if a bit rare. Creating UMBs in vram segments A

If I remember correctly, even with a color card, applications switching to a monochrome video mode was possible if a bit rare. Creating UMBs in vram segments A000, B000 or B800 was always considered a suicidal configuration, and EMM386 would not do it unless forced. If I see the man page http://www.manmrk.net/tutorials/DOS/help/emm386.exe.htm http://www.manmrk.net/tutorials/DOS/help/emm386.exe.htm the vram segments are not allowed for the FRAME= and Mx options, rang A000-BFFF is forbidden.