diff options
Diffstat (limited to 'src/mess/drivers/pc9801.c')
-rw-r--r-- | src/mess/drivers/pc9801.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/src/mess/drivers/pc9801.c b/src/mess/drivers/pc9801.c index 33d3115c795..ef2d725b894 100644 --- a/src/mess/drivers/pc9801.c +++ b/src/mess/drivers/pc9801.c @@ -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: |