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a77271cfa6
XGA: Fix crash when (S)VGA cards not selected as the primary display (e.g.: EGA, CGA. etc). Better handling of the VGA on/off passthrough (vga_on variable). MCA side: to avoid lfb issues, bit 0 of POS4 will be always enabled regardless of the ram size (most software uses the >16MB memory method). Better handling of the BIOS ROM mapping and Memory Mapped I/O during the MCA PS/2 POST and resets, fixes 40 25 hang (once and for all). Re-organized the ROM loading in ISA mode.