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Add alternate font tables and associated loading logic in video BIOS, allowing correct gaps between "wide" characters (e.g. m,w,M,W,T,Z,0) in all VGA machine types.

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Update all related BIOS memory values and CRTC registers when loading fonts, fixing quirks in some textmode programs like Inertia Player. Based in part on a patch by h-a-l-9000.

Improve support for MDA emulation in the vgaonly machine type, as it is the only way the video BIOS can make use of the 14-line alternate symbols.

Be compatible by setting the INT 43h vector to the first half of the 8-line font table for standard text modes. Fixes a few obscure games and demos that rely on this BIOS behavior.

Move VESA mode table and OEM string before font tables in the video ROM, which is a more compatible ordering and gives the data low address offsets that work around a bug in some programs such as the Abuse game and Molejo demo.

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3932
This commit is contained in:
ripsaw8080 2015-08-28 14:37:25 +00:00
parent f66ff6e3d7
commit 1b7b92ed8a
5 changed files with 254 additions and 80 deletions
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4
src/dos/dos_keyboard_layout.cpp
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@ -911,6 +911,8 @@ Bitu keyboard_layout::read_codepage_file(const char* codepage_file_name, Bit32s
for (Bitu i=0;i<256*16;i++) {
phys_writeb(font16pt+i,cpi_buf[font_data_start+i]);
}
// terminate alternate list to prevent loading
phys_writeb(Real2Phys(int10.rom.font_16_alternate),0);
font_changed=true;
} else if (font_height==0x0e) {
// 14x8 font
@ -918,6 +920,8 @@ Bitu keyboard_layout::read_codepage_file(const char* codepage_file_name, Bit32s
for (Bitu i=0;i<256*14;i++) {
phys_writeb(font14pt+i,cpi_buf[font_data_start+i]);
}
// terminate alternate list to prevent loading
phys_writeb(Real2Phys(int10.rom.font_14_alternate),0);
font_changed=true;
} else if (font_height==0x08) {
// 8x8 fonts