Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-19 23:12:11 +03:00
Code Issues Actions 6 Packages Projects Releases Wiki Activity

(mess) southbridge: greatly increase refresh line delay (nw)

Browse Source 
--
Passes floppy controller test, still crashes
This commit is contained in:
cracyc 2013-11-05 04:00:32 +00:00
parent 46d050ba47
commit 75eaf393e6
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
src/mess/machine/southbridge.c
View File

@ -383,7 +383,7 @@ READ8_MEMBER(southbridge_device::pc_dma_read_word)
if(m_dma_channel == -1)
return 0xff;
UINT16 result;
offs_t page_offset = (((offs_t) m_dma_offset[1][m_dma_channel & 3]) << 16) & 0xFF0000;
offs_t page_offset = (((offs_t) m_dma_offset[1][m_dma_channel & 3]) << 16) & 0xFE0000;
result = prog_space.read_word(page_offset + ( offset << 1 ) );
m_dma_high_byte = result & 0xFF00;
@ -397,7 +397,7 @@ WRITE8_MEMBER(southbridge_device::pc_dma_write_word)
address_space& prog_space = m_maincpu->space(AS_PROGRAM); // get the right address space
if(m_dma_channel == -1)
return;
offs_t page_offset = (((offs_t) m_dma_offset[1][m_dma_channel & 3]) << 16) & 0xFF0000;
offs_t page_offset = (((offs_t) m_dma_offset[1][m_dma_channel & 3]) << 16) & 0xFE0000;
prog_space.write_word(page_offset + ( offset << 1 ), m_dma_high_byte | data);
}
@ -459,7 +459,7 @@ READ8_MEMBER( southbridge_device::at_portb_r )
/* This needs fixing/updating not sure what this is meant to fix */
if ( --m_poll_delay < 0 )
{
m_poll_delay = 3;
m_poll_delay = 20;
m_at_offset1 ^= 0x10;
}
data = (data & ~0x10) | ( m_at_offset1 & 0x10 );