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(mess) pc9801: squeeze a few more bugs out of the egc (nw)

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This commit is contained in:
cracyc 2015-02-20 21:42:20 -06:00
parent a614eaf6f8
commit a9a7941f93
1 changed files with 11 additions and 6 deletions
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17
src/mess/drivers/pc9801.c
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@ -1410,7 +1410,7 @@ void pc9801_state::egc_blit_w(UINT32 offset, UINT16 data, UINT16 mem_mask)
{
if(BIT(m_egc.regs[2], 10))
{
m_egc.leftover[0] = m_egc.leftover[1] = m_egc.leftover[2] = m_egc.leftover[3] = 0;
m_egc.leftover[0] = 0;
egc_shift(0, data);
// leftover[0] is inited above, set others to same
m_egc.leftover[1] = m_egc.leftover[2] = m_egc.leftover[3] = m_egc.leftover[0];
@ -1422,8 +1422,8 @@ void pc9801_state::egc_blit_w(UINT32 offset, UINT16 data, UINT16 mem_mask)
// mask off the bits before the start
if(m_egc.first)
{
mask &= dir ? ~((1 << dst_off) - 1) : ((1 << (dst_off + 1)) - 1);
if(!m_egc.init)
mask &= dir ? ~((1 << dst_off) - 1) : ((1 << (16 - dst_off)) - 1);
if(BIT(m_egc.regs[2], 10) && !m_egc.init)
m_egc.leftover[0] = m_egc.leftover[1] = m_egc.leftover[2] = m_egc.leftover[3] = 0;
}
@ -1513,6 +1513,11 @@ UINT16 pc9801_state::egc_blit_r(UINT32 offset, UINT16 mem_mask)
m_egc.pat[2] = m_video_ram_2[plane_off + (0x4000 * 3)];
m_egc.pat[3] = m_video_ram_2[plane_off];
}
if(m_egc.first && !m_egc.init)
{
m_egc.leftover[0] = m_egc.leftover[1] = m_egc.leftover[2] = m_egc.leftover[3] = 0;
m_egc.init = true;
}
for(int i = 0; i < 4; i++)
m_egc.src[i] = egc_shift(i, m_video_ram_2[plane_off + (((i + 1) & 3) * 0x4000)]);
@ -1568,7 +1573,6 @@ WRITE16_MEMBER(pc9801_state::upd7220_grcg_w)
{
if((m_grcg.mode & (1 << i)) == 0)
{
if(mem_mask & 0xff)
{
vram[offset | (((i + 1) & 3) * 0x8000)] &= ~(data >> 0);
@ -1896,7 +1900,7 @@ WRITE8_MEMBER(pc9801_state::grcg_w)
else if(offset == 7)
{
// logerror("%02x GRCG TILE %02x\n",data,m_grcg.tile_index);
m_grcg.tile[m_grcg.tile_index] = BITSWAP16((UINT16) data,8,9,10,11,12,13,14,15,0,1,2,3,4,5,6,7);
m_grcg.tile[m_grcg.tile_index] = BITSWAP8(data,0,1,2,3,4,5,6,7);
m_grcg.tile_index ++;
m_grcg.tile_index &= 3;
return;
@ -1910,7 +1914,8 @@ WRITE16_MEMBER(pc9801_state::egc_w)
if(!m_ex_video_ff[2])
return;
COMBINE_DATA(&m_egc.regs[offset]);
if(!(m_egc.regs[1] & 0x6000) || (offset != 4)) // why?
COMBINE_DATA(&m_egc.regs[offset]);
switch(offset)
{
case 1: