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- applied patch.xwin-timing by Suboner@aol.com. His comments:

Browse Source 
Basicly what it does is, it help VGA16 find the syncing, because of the
  technique it uses, bochs did not help it figure out the timing diffrences
  with its one size fits all timing.
This commit is contained in:
Bryce Denney 2001-05-03 17:00:38 +00:00
parent ac331dcdb2
commit 596679b875
1 changed files with 35 additions and 16 deletions
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51
bochs/iodev/vga.cc
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@ -352,22 +352,41 @@ bx_vga_c::read(Bit32u address, unsigned io_len)
// printf("horiz = %d, vert = %d\n", BX_VGA_THIS s.horiz_tick, BX_VGA_THIS s.vert_tick);
if (BX_VGA_THIS s.horiz_tick >= 100) { // ??? bogus # 100
BX_VGA_THIS s.horiz_tick = 0;
horiz_retrace = 1;
}
else {
BX_VGA_THIS s.horiz_tick++;
horiz_retrace = 0;
}
if (BX_VGA_THIS s.vert_tick >= 100) { // ??? bogus # 100
BX_VGA_THIS s.vert_tick = 0;
vert_retrace = 1;
}
else {
BX_VGA_THIS s.vert_tick++;
vert_retrace = 0;
}
if(BX_VGA_THIS s.misc_output.clock_select == 0){ // 25.175 clock 112.5% the length of 28.32
if (BX_VGA_THIS s.horiz_tick >= 112) {
BX_VGA_THIS s.horiz_tick = 0;
horiz_retrace = 1;
}
else {
BX_VGA_THIS s.horiz_tick++;
horiz_retrace = 0;
}
if (BX_VGA_THIS s.vert_tick >= 112) {
BX_VGA_THIS s.vert_tick = 0;
vert_retrace = 1;
}
else {
BX_VGA_THIS s.vert_tick++;
vert_retrace = 0;
}
}else{ // clock_select 1 is assumed to be the 28.32 clock in XF86_VGA16
if (BX_VGA_THIS s.horiz_tick >= 100) { // ??? bogus # 100
BX_VGA_THIS s.horiz_tick = 0;
horiz_retrace = 1;
}
else {
BX_VGA_THIS s.horiz_tick++;
horiz_retrace = 0;
}
if (BX_VGA_THIS s.vert_tick >= 100) { // ??? bogus # 100
BX_VGA_THIS s.vert_tick = 0;
vert_retrace = 1;
}
else {
BX_VGA_THIS s.vert_tick++;
vert_retrace = 0;
}
} // probably add more clock modes here for diffrent resolutions
retval = 0;
if (horiz_retrace || vert_retrace)