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Add support for monochrome mode:

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- EGA and VGA mode 0x0F (implement plane masking in the attribute controller)
- re-factor EGA monitor emulation (attribute controller bit is used to detect monochrome mode, horizontal frequency to choose 16/64 colors)

Hardware blinking in graphics mode is still not supported.

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3813
This commit is contained in:
Ralf Grillenberger 2013-01-26 22:01:32 +00:00
parent 2fea508f7f
commit 81226995de
5 changed files with 108 additions and 37 deletions
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16
src/ints/int10_modes.cpp
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@ -1046,6 +1046,8 @@ bool INT10_SetVideoMode(Bit16u mode) {
break;
case M_LIN4:
case M_EGA:
if (CurMode->mode == 0x0f)
gfx_data[0x7]=0x05; // only planes 0 and 2 are used
gfx_data[0x6]|=0x05; //graphics mode at 0xa000-affff
break;
case M_CGA4:
@ -1075,12 +1077,14 @@ bool INT10_SetVideoMode(Bit16u mode) {
att_data[0x10]=0x01; //Color Graphics
switch (CurMode->mode) {
case 0x0f:
att_data[0x10]|=0x0a; //Monochrome
att_data[0x01]=0x08;
att_data[0x04]=0x18;
att_data[0x05]=0x18;
att_data[0x09]=0x08;
att_data[0x0d]=0x18;
att_data[0x12]=0x05; // planes 0 and 2 enabled
att_data[0x10]|=0x0a; // monochrome and blinking
att_data[0x01]=0x08; // low-intensity
att_data[0x04]=0x18; // blink-on case
att_data[0x05]=0x18; // high-intensity
att_data[0x09]=0x08; // low-intensity in blink-off case
att_data[0x0d]=0x18; // high-intensity in blink-off
break;
case 0x11:
for (i=1;i<16;i++) att_data[i]=0x3f;