Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-25 09:50:04 +03:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

mc6845 : fixed total freeze of MESS when interlace&video mode was selected

Browse Source 
on super80v. Also added some comments.
This commit is contained in:
Robbbert 2013-12-27 08:07:03 +00:00
parent 2782ff9cfa
commit 45fa51294d
1 changed files with 13 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
src/emu/video/mc6845.c
View File

@ -517,6 +517,17 @@ void mc6845_device::recompute_parameters(bool postload)
attoseconds_t refresh = HZ_TO_ATTOSECONDS(m_clock) * (m_horiz_char_total + 1) * vert_pix_total;
// This doubles the vertical resolution, required for 'interlace and video' mode support.
// Tested and works for super80v, which was designed with this in mind (choose green or monochrome colour in config switches).
// However it breaks some other drivers (apricot,a6809,victor9k,bbc(mode7)).
// So, it is commented out for now.
// Also, the mode-register change needs to be added to the changed-parameter tests above.
if (MODE_INTERLACE_AND_VIDEO)
{
//max_visible_y *= 2;
//vert_pix_total *= 2;
}
if(m_show_border_area)
visarea.set(0, horiz_pix_total+1, 0, vert_pix_total+1);
else
@ -648,8 +659,8 @@ void mc6845_device::handle_line_timer()
// For rudimentary 'interlace and video' support, m_raster_counter increments by 1 rather than the correct 2.
// The correct test would be:
// if ( m_raster_counter == m_max_ras_addr )
if ( m_raster_counter == (MODE_INTERLACE_AND_VIDEO ? m_max_ras_addr + 1 : m_max_ras_addr) )
// if ( m_raster_counter == (MODE_INTERLACE_AND_VIDEO ? m_max_ras_addr + 1 : m_max_ras_addr) )
if ( m_raster_counter == m_max_ras_addr )
{
/* Check if we have reached the end of the vertical area */
if ( m_line_counter == m_vert_char_total )