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mc6845: always set bit 0 of maximum raster address in interlace video

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mode, fixes apricot screen height
This commit is contained in:
Dirk Best 2015-06-09 00:27:10 +02:00
parent 72dd919d34
commit 4e254371e2
1 changed files with 5 additions and 1 deletions
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6
src/emu/video/mc6845.c
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@ -453,7 +453,11 @@ READ_LINE_MEMBER( mc6845_device::vsync_r )
void mc6845_device::recompute_parameters(bool postload)
{
UINT16 hsync_on_pos, hsync_off_pos, vsync_on_pos, vsync_off_pos;
//UINT16 video_char_height = (MODE_INTERLACE_AND_VIDEO ? m_max_ras_addr + 1 : m_max_ras_addr) + 1;
// needed for the apricot, correct?
if (MODE_INTERLACE_AND_VIDEO)
m_max_ras_addr |= 1;
UINT16 video_char_height = m_max_ras_addr + 1; // fix garbage at the bottom of the screen (eg victor9k)
// Would be useful for 'interlace and video' mode support...
// UINT16 frame_char_height = (MODE_INTERLACE_AND_VIDEO ? m_max_ras_addr / 2 : m_max_ras_addr) + 1;