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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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17
src/ints/int10.cpp
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@ -52,7 +52,7 @@ static Bitu INT10_Handler(void) {
switch (reg_ah) {
case 0x00: /* Set VideoMode */
Mouse_BeforeNewVideoMode(true);
INT10_SetVideoMode(reg_al);
INT10_SetVideoMode(reg_al);
Mouse_AfterNewVideoMode(true);
break;
case 0x01: /* Set TextMode Cursor Shape */
@ -210,15 +210,15 @@ static Bitu INT10_Handler(void) {
/* Textmode calls */
case 0x00: /* Load user font */
case 0x10:
INT10_LoadFont(SegPhys(es)+reg_bp,reg_al==0x10,reg_cx,reg_dx,reg_bl,reg_bh);
INT10_LoadFont(SegPhys(es)+reg_bp,reg_al==0x10,reg_cx,reg_dx,reg_bl&0x7f,reg_bh);
break;
case 0x01: /* Load 8x14 font */
case 0x11:
INT10_LoadFont(Real2Phys(int10.rom.font_14),reg_al==0x11,256,0,reg_bl,14);
INT10_LoadFont(Real2Phys(int10.rom.font_14),reg_al==0x11,256,0,reg_bl&0x7f,14);
break;
case 0x02: /* Load 8x8 font */
case 0x12:
INT10_LoadFont(Real2Phys(int10.rom.font_8_first),reg_al==0x12,256,0,reg_bl,8);
INT10_LoadFont(Real2Phys(int10.rom.font_8_first),reg_al==0x12,256,0,reg_bl&0x7f,8);
break;
case 0x03: /* Set Block Specifier */
IO_Write(0x3c4,0x3);IO_Write(0x3c5,reg_bl);
@ -226,7 +226,7 @@ static Bitu INT10_Handler(void) {
case 0x04: /* Load 8x16 font */
case 0x14:
if (!IS_VGA_ARCH) break;
INT10_LoadFont(Real2Phys(int10.rom.font_16),reg_al==0x14,256,0,reg_bl,16);
INT10_LoadFont(Real2Phys(int10.rom.font_16),reg_al==0x14,256,0,reg_bl&0x7f,16);
break;
/* Graphics mode calls */
case 0x20: /* Set User 8x8 Graphics characters */
@ -288,7 +288,6 @@ graphics_chars:
reg_bp=RealOff(int10.rom.font_8_second);
break;
case 0x05: /* alpha alternate 9x14 */
if (!IS_VGA_ARCH) break;
SegSet16(es,RealSeg(int10.rom.font_14_alternate));
reg_bp=RealOff(int10.rom.font_14_alternate);
break;
@ -542,8 +541,8 @@ graphics_chars:
break;
case 0x02: /* Set videomode */
Mouse_BeforeNewVideoMode(true);
reg_al=0x4f;
reg_ah=VESA_SetSVGAMode(reg_bx);
reg_al=0x4f;
reg_ah=VESA_SetSVGAMode(reg_bx);
Mouse_AfterNewVideoMode(true);
break;
case 0x03: /* Get videomode */
@ -764,7 +763,5 @@ void INT10_Init(Section* /*sec*/) {
//Init the 0x40 segment and init the datastructures in the the video rom area
INT10_SetupRomMemory();
INT10_Seg40Init();
INT10_SetupVESA();
INT10_SetupRomMemoryChecksum();//SetupVesa modifies the rom as well.
INT10_SetVideoMode(0x3);
}