Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-25 01:40:16 +03:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

yeah.. the blitter seems to watch the entire bus... (nw)

Browse Source
This commit is contained in:
mamehaze 2015-03-21 23:23:22 +00:00
parent 52c7bf8e5b
commit 52e378aa5b
1 changed files with 61 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

84
src/mame/drivers/twins.c
View File

@ -66,7 +66,6 @@ public:
twins_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag),
m_maincpu(*this, "maincpu"),
m_videoram(*this, "videoram"),
m_paletteram(*this, "paletteram"),
m_palette(*this, "palette"),
m_i2cmem(*this, "i2cmem"),
@ -74,7 +73,6 @@ public:
{ }
required_device<cpu_device> m_maincpu;
required_shared_ptr<UINT16> m_videoram;
optional_shared_ptr<UINT16> m_paletteram;
required_device<palette_device> m_palette;
optional_device<i2cmem_device> m_i2cmem;
@ -86,6 +84,7 @@ public:
DECLARE_WRITE16_MEMBER(porte_paloff0_w);
DECLARE_WRITE16_MEMBER(spider_paloff0_w);
DECLARE_WRITE16_MEMBER(spider_blitter_w);
DECLARE_READ16_MEMBER(spider_blitter_r);
DECLARE_READ16_MEMBER(spider_port_18_r);
DECLARE_READ16_MEMBER(spider_port_1e_r);
@ -94,13 +93,25 @@ public:
int m_spriteswidth;
int m_spritesaddr;
UINT16 m_mainram[0x10000 / 2];
UINT16 m_videoram[0x10000 / 2];
DECLARE_VIDEO_START(twins);
DECLARE_VIDEO_START(twinsa);
UINT32 screen_update_twins(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
virtual void machine_start();
UINT16* m_rom16;
UINT8* m_rom8;
};
void twins_state::machine_start()
{
m_rom16 = (UINT16*)memregion("maincpu")->base();
m_rom8 = memregion("maincpu")->base();
}
/* port 4 is eeprom */
READ16_MEMBER(twins_state::twins_port4_r)
@ -152,6 +163,24 @@ WRITE16_MEMBER(twins_state::porte_paloff0_w)
m_paloff = 0;
}
READ16_MEMBER(twins_state::spider_blitter_r)
{
if (offset <= 0x10000 / 2)
{
return m_mainram[offset&0x7fff];
}
else if (offset <= 0x20000 / 2)
{
return m_videoram[offset&0x7fff];
}
else
{
UINT16 *src = m_rom16;
return src[offset];
}
}
WRITE16_MEMBER(twins_state::spider_blitter_w)
{
// this is very strange, we use the offset (address bits) not data bits to set values..
@ -159,15 +188,15 @@ WRITE16_MEMBER(twins_state::spider_blitter_w)
if (m_spritesinit == 1)
{
// printf("spider_blitter_w %08x %04x %04x (init?) (base?)\n", offset * 2, data, mem_mask);
printf("spider_blitter_w %08x %04x %04x (init?) (base?)\n", offset * 2, data, mem_mask);
m_spritesinit = 2;
m_spritesaddr = offset;
}
else if (m_spritesinit == 2)
{
// printf("spider_blitter_w %08x %04x %04x (init2) (width?)\n", offset * 2, data, mem_mask);
m_spriteswidth = offset;
printf("spider_blitter_w %08x %04x %04x (init2) (width?)\n", offset * 2, data, mem_mask);
m_spriteswidth = offset & 0xff;
if (m_spriteswidth == 0)
m_spriteswidth = 80;
@ -176,32 +205,41 @@ WRITE16_MEMBER(twins_state::spider_blitter_w)
}
else
{
UINT8 *src = memregion( "maincpu" )->base();
// printf("spider_blitter_w %08x %04x %04x (previous data width %d address %08x)\n", offset * 2, data, mem_mask, m_spriteswidth, m_spritesaddr);
offset &=0x7fff;
for (int i = 0; i < m_spriteswidth; i++)
if (offset <= 0x10000 / 2)
{
UINT16 data = (src[m_spritesaddr+1] << 8) | src[m_spritesaddr];
m_spritesaddr += 2;
m_videoram[offset] = data;
offset++;
offset &= 0x7fff;
COMBINE_DATA(&m_mainram[offset&0x7fff]);
}
else if (offset <= 0x20000 / 2)
{
COMBINE_DATA(&m_videoram[offset&0x7fff]);
}
else if (offset <= 0x30000 / 2)
{
UINT8 *src = m_rom8;
// printf("spider_blitter_w %08x %04x %04x (previous data width %d address %08x)\n", offset * 2, data, mem_mask, m_spriteswidth, m_spritesaddr);
offset &= 0x7fff;
for (int i = 0; i < m_spriteswidth; i++)
{
UINT16 data = (src[(m_spritesaddr*2) + 1] << 8) | src[(m_spritesaddr*2)];
m_spritesaddr ++;
m_videoram[offset] = data;
offset++;
offset &= 0x7fff;
}
}
else
{
printf("spider_blitter_w unhandled RAM access %08x %04x %04x", offset * 2, data, mem_mask);
}
}
}
static ADDRESS_MAP_START( twins_map, AS_PROGRAM, 16, twins_state )
AM_RANGE(0x00000, 0x0ffff) AM_RAM
AM_RANGE(0x10000, 0x1ffff) AM_RAM AM_SHARE("videoram")
AM_RANGE(0x20000, 0xfffff) AM_ROM AM_WRITE(spider_blitter_w)
AM_RANGE(0x00000, 0xfffff) AM_READWRITE(spider_blitter_r, spider_blitter_w)
ADDRESS_MAP_END
static ADDRESS_MAP_START( twins_io, AS_IO, 16, twins_state )
@ -226,7 +264,7 @@ UINT32 twins_state::screen_update_twins(screen_device &screen, bitmap_ind16 &bit
bitmap.fill(m_palette->black_pen());
count=0;
UINT8 *videoram = reinterpret_cast<UINT8 *>(m_videoram.target());
UINT8 *videoram = (UINT8*)m_videoram;
for (y=0;y<yyy;y++)
{
for(x=0;x<xxx;x++)